AT527402B1 - pipe section for guiding a fluid flow - Google Patents

Abstract

The present invention relates to a pipe section (10) for guiding a fluid flow (F), having an inlet section (20) for the inlet of the fluid flow (F) and an outlet section (30) for the outlet of the fluid flow (F), wherein the pipe section (10) has a pipe curvature radius (KR) between the inlet section (20) and the outlet section (30), wherein a dividing section (40) is arranged downstream of the inlet section (20) for dividing the fluid flow (F) into at least two partial fluid flows (TF), wherein the dividing section (40) opens into at least two partial pipes (50) and divides a partial fluid flow (TF) into a partial pipe (50) each, and downstream the partial pipes (50) lead into a common merging section (60), which recombines the partial fluid flows (TF) into a common fluid flow (F), wherein furthermore the at least two Partial pipes (50) between the dividing section (40) and the merging section (60) each have a partial radius of curvature (TKR) which is larger than the pipe radius of curvature (KR), wherein at least one partial pipe (50) is guided from an outer wall (12) of the pipe section (10) to an inner wall (14) and/or at least one partial pipe (50) is guided from an inner wall (14) of the pipe section (50) to an outer wall (12) and at least one partial pipe (50) is guided from an upper roof wall (16) of the pipe section (10) to a lower bottom wall (18) and/or at least one partial pipe (50) is guided from a lower bottom wall (18) of the pipe section (50) to an upper roof wall (16), wherein the partial pipes (50) are guided from the outer wall (12) to the inner wall (14), from the roof wall (16) to the bottom wall (18) and are combined with each other in a loop-like manner.

Description

Description

PIPE SECTION FOR GUIDING A FLUID FLOW

[0001] The present invention relates to a pipe section for guiding a fluid flow and to a pipeline with such a pipe section.

[0002] It is known that pipelines are used to guide fluid flows. Such pipelines extend, among other things, along curved guide paths and at least partially around tight bends. In order to be able to guide the fluid flow with the pipeline in curved guide paths, the pipeline is usually designed with curved pipe sections which can guide the fluid flow around the respective curve. Such pipe sections can be individual components designed as bends or can be integrated into a pipeline.

[0003] A disadvantage of the known solutions is that complex flow conditions can develop within the pipe sections guided around the bend. For example, when using pipes in fuel cell systems, this can lead to the fact that, in tight spaces, strongly curved pipe sections have to guide the fluid flow around the respective bend. In such strongly curved pipe sections, it can happen that the guided fluid, for example the gas flow towards or away from a fuel cell stack, develops turbulence. This is based on the fact that even with laminar flow conditions in a straight section of a pipe, these flow conditions also change as the pipe section changes and the extension around a bend. This can lead to part of the internal and guided flow of the fluid flow detaching from the side wall in narrow curved pipe sections, generating turbulence and, for example, forming additional flow resistance with vortices. Accordingly, known solutions design fuel cell systems with pipes that either have a sufficiently large and therefore oversized cross-section or that avoid tight curves for the pipe sections through a clever choice of geometry. These are massive restrictions on design freedom and can lead to increased effort, a larger space requirement and/or increased costs.

[0004] Pipe sections for guiding a fluid flow are known, for example, from DE 102006001417 A1, SU 901680 A1, US 5307830 A, CN 102155478 A, CN 106287087 A and US 2723680 A.

[0005] It is the object of the present invention to at least partially remedy the disadvantages described above. In particular, it is the object of the present invention to improve the flow conditions in pipelines in a flow-efficient and simple manner, even with tight bending radii.

[0006] The above object is achieved by a pipe section with the features of claim 1 and a pipeline with the features of claim 14. Further features and details of the invention emerge from the subclaims, the description and the drawings. Features and details that are described in connection with the pipe section according to the invention naturally also apply in connection with the pipeline according to the invention and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is always made to each other or can be made.

[0007] According to the invention, a pipe section for guiding a fluid flow is proposed. Such a pipe section has an inlet section for the inlet of the fluid flow and an outlet section for the outlet of the fluid flow. Furthermore, the pipe section is equipped with a pipe curvature radius between the inlet section and the outlet section. A pipe section according to the invention is characterized in that a dividing section is arranged downstream of the inlet section for dividing a fluid flow into at least two partial fluid

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streams. The dividing section opens into at least two partial pipes and thus leads a partial fluid stream into a respective partial pipe. Downstream of these partial pipes, the same lead into a common merging section, which re-merges the partial fluid streams into a common fluid stream. The at least two partial pipes each have a partial radius of curvature between the dividing section and the merging section, which is larger than the pipe radius of curvature. The at least two partial pipes each have a partial radius of curvature between the dividing section and the merging section, which is larger than the pipe radius of curvature, in particular at least on average over their extent.

[0008] The core idea of the invention is based on the fact that in a pipe section which is guided around a bend, a division of the guided fluid flow takes place. A pipe section can be part of an existing pipe or a separate component with connecting sections, for example pipe flanges, for integration into a longer pipeline. Such a pipe section for guiding the fluid flow around a curve usually extends along a central axis which forms and defines the center line of the pipe in this pipe section. The radius of curvature as the pipe curvature radius is defined as the radius of curvature of this center line. In other words, the inner wall, i.e. the inner wall section of the pipe section, will have a correspondingly significantly smaller radius of curvature than the radius of curvature of the outer wall section of this pipe section. For all guided fluid flows within the pipe section, however, the radii of curvature that the respective flow line follows are crucial. What is particularly important is the smallest radius of curvature, i.e. the tightest bend that the streamlines of the guided fluid flow must follow. The radii of curvature of all streamlines are significantly larger than the limiting inner wall section, which can improve flow efficiency.

[0009] According to the invention, the guided fluid flow is now divided into at least two partial fluid flows. This division takes place in the division section and is designed in particular as a passive division in the form of a passive division section, i.e. is ensured by the flow speed of the fluid flow itself. The fluid flow flows through the division section and is divided there into the different partial fluid flows. After this division or directly after this division, these partial fluid flows pass into at least two partial pipes, so that each of these partial fluid flows is now itself guided through a separate partial pipe. The partial pipes are accordingly smaller and each have a smaller flow cross-section than the pipe section in the area of the inlet section and the division section.

[0010] According to the invention, a large part, in particular the entire fluid flow, is divided into the partial fluid flows, which are then guided to partial pipes that are fully provided with guide walls. These partial pipes now extend from the division section to the merging section. In the merging section, the separately guided partial fluid flows are brought together again and in particular fed back to the outlet section of the pipe section as a common fluid flow.

[0011] The decisive advantage according to the invention is that a different, namely a larger, partial curvature radius can now be provided for all individual partial pipes than is the case for the pipe curvature radius. By dividing it up, it is therefore possible that through such a clever geometric arrangement of the individual partial pipes, the partial fluid flows within each partial pipe follow a larger partial curvature radius than would be the case with a classic pipe section with the pipe curvature radius, despite being guided around the same bend. This possibility of increasing all partial curvature radii of the partial pipes is based on the fact that this increase can take place through clever selection and arrangement of the individual partial pipes. According to the invention, the partial pipes are combined from the outer wall to the inner wall, from the roof wall to the bottom wall and intertwined with each other in a loop-like manner in order to ensure an increase in the pipe curvature radius of the fluid flow to the partial curvature radius for the respective partial fluid flow. This solution according to the invention is thus characterized by

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also compared to an alternative solution in which a central guide rib in the pipe curvature radius of a pipe bend can be easily manufactured to even out the flow, although the strongest curvature at the inner radius can lead to higher pressure losses.

[0012] Because the partial curvature radii could now be increased relative to the pipe curvature radius, the flow conditions and in particular the influence of this curvature on the partial fluid flows also change. By increasing the partial curvature radii, this change is positive with regard to the stability of the flow, since an increased partial curvature radius results in a reduction in the influence on the flow stability of the partial fluid flows. In other words, the negative influence of the curvature on the flow through the pipe section is reduced by the design according to the invention.

[0013] As can be seen from the above explanation, it is now possible to improve the fluid stability and the flow stability in the partial fluid flows by dividing the pipes into individual sub-pipes and still guide the fluid flow around the desired curve along the desired geometry with the same geometric dimensions and the same pipe curvature radius. A cost-effective and simple solution is therefore provided to enable an improved flow situation inside the pipe section while maintaining the same installation space and the same tight bending radii for the pipe section. This is done in particular by avoiding or at least reducing additional pressure losses at such a bend in the pipe. This flow can also be homogenized within the pipe section in this way, so that in particular a laminar or essentially laminar flow also remains in the area of the outlet section.

[0014] In the embodiment according to the invention, it can be advantageous if a cavity is created between the partial pipes, with or without a casing. One possible use is to guide a further ambient flow, if, for example, a casing pipe is provided. The introduction of stabilizing elements is also conceivable. For example, ribs can extend between the adjacent partial pipes and thus ensure mutual support. Depending on the actual arrangement, the desired increase in the partial curvature radii can result in an increased extension in a third dimension, for example in a vertical direction. This creates a design freedom which allows a more compact deflection to be combined with increased partial curvature radii even in narrow areas by increasing the extension in a vertical direction.

[0015] It can be advantageous if, in a pipe section according to the invention, the at least two partial pipes extend in rotation around one another and/or in rotation around a central axis of the pipe section. Such a rotational extension is not to be understood as a movement, but rather as an intertwined geometric extension of these partial pipes. As will be explained in more detail later with reference to the figures, the partial pipes can extend next to one another in a bundle-like manner and this bundle can be designed to be twisted in itself, so to speak. This twisting or rotation in the extension of the partial pipes means that the enlargement of the pipe curvature radius to the partial curvature radii in three-dimensional space can utilize the entire volume of the pipe section between the inlet section and outlet section and even beyond that in one plane. This brings great advantages in particular when not just two partial pipes, but three, four, five or even more partial pipes are to be used. This also allows the individual partial fluid flows to be influenced by swirl, so that not only can the flow conditions be improved, but also, if desired, a mixing function can be integrated into the pipe section by introducing a local fluid swirl. Such partial pipes can also be understood and described as a screw-like arrangement of the partial pipes in the way they extend in a rotating manner.

[0016] It is further provided that in a pipe section according to the invention at least

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a partial pipe is guided from an outer wall of the pipe section to an inner wall and/or at least one partial pipe is guided from an inner wall of the pipe section to an outer wall. This is a particularly simple possibility of achieving the inventive enlargement of the partial curvature radii starting from the pipe curvature radius.

[0017] In addition to the solution according to the previous paragraph, it is provided that in a pipe section according to the invention at least one partial pipe is guided from an upper roof wall of the pipe section to a lower floor wall and/or at least one partial pipe is guided from a lower floor wall of the pipe section to an upper roof wall. This is also a particularly simple and cost-effective geometric implementation for increasing the partial curvature radii. A combination of the design of this and the previous paragraph is of course also conceivable for the partial pipes described. It is also possible for the partial pipes not to extend from the outer wall to the inner wall or inner wall to the outer wall, but only partially, for example from the outer wall to the roof wall, from the roof wall to the inner wall, from the inner wall to the floor wall or vice versa.

[0018] It also brings advantages if, in a pipe section according to the invention, at least three partial pipes are arranged between the dividing section and the combined discharge section. Preferably, even more than three partial pipes are provided, for example four partial pipes, five partial pipes or even more partial pipes. Depending on the size of the diameter of the pipe section, more or fewer partial pipes can be provided, so that the concept according to the invention can also be adapted to different sizes of pipe sections. The more partial pipes are provided, the finer the division and the stronger the positive influence on the flow conditions. In addition, as the number of partial pipes increases, the spaces between the partial pipes can also be used to guide the flow, which can reduce the required installation space of the envelope and minimize pressure losses. The smaller the number of partial pipes is selected, the less noticeable the complexity and thus the cost of the pipe section according to the invention. However, additional guide elements would be useful for utilizing the spaces between the partial pipes, advantageously by partially connecting the pipes with individual ribs.

[0019] It is also advantageous if, in a pipe section according to the invention, the at least two partial pipes have identical or essentially identical flow cross-sections. In other words, all partial pipes are preferably provided for the same volume flows, so that a division can be made evenly between the different partial fluid flows. These identical or essentially identical flow cross-sections also serve to even out the flow conditions through the partial pipes. A local reduction in the flow cross-sections is also conceivable in order to meet local adaptation to geometric requirements, for example of a cladding pipe.

[0020] It is also possible that in a pipe section according to the invention the at least two partial pipes have identical or essentially identical pipe lengths. This relates in particular to a joint division and a joint merging at an identical or essentially identical position in the pipe section. The identical or essentially identical pipe lengths of the partial pipes also even out the flow situation in the individual partial pipes, so that further stabilization of the individual partial fluid flows can be expected. In other words, evened out flow conditions for all partial pipes can be achieved in an advantageous manner.

[0021] It is also advantageous if, in a pipe section according to the invention, the at least two partial pipes have identical or essentially identical partial curvature radii. Similar to the preceding paragraphs, this also leads to a homogeneous distribution of the flow conditions across the partial pipes. The individual partial curvature radii are identical or essentially identical to one another, so that here too the flow improvement for all partial fluid flows can be achieved with identical or essentially identical functionality.

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[0022] It is also advantageous if the partial pipes in a pipe section according to the invention are surrounded by a jacket pipe. Such a jacket pipe can also be referred to as a casing pipe and protects the individual partial pipes, in particular from mechanical influences. This can be particularly advantageous in that the jacket pipe continues the pipe wall of the inlet section and/or the outlet section, so that these partial pipes are not visible from the outside of the pipe section. In addition to a continuation of the outer walls, this has various advantages. Firstly, a mechanical fastening of the pipe section, for example by means of a pipe clamp, to the jacket pipe is possible in the same way as on other sections of a pipeline equipped in this way. In addition, the jacket pipe protects the inner partial pipes mechanically, so that the wall thicknesses for the partial pipes can be significantly reduced, since they only have to ensure the guide functionality for the partial fluid flows.

[0023] It also has advantages if, in a pipe section according to the invention, the sum of the flow cross sections of the at least two partial pipes corresponds or substantially corresponds to the flow cross section of the inlet section and/or the outlet section. Preferably, the entire flow cross sections remain identical or substantially identical over the course of the pipe section, so that no acceleration or deceleration of the fluid flows or the partial fluid flows takes place. This avoids having to accept undesirable pressure losses or undesirable reductions in the flow speed of partial fluid flows or of the entire fluid flow.

[0024] It is also advantageous if, in a pipe section according to the invention, the at least two partial pipes are designed to completely or essentially completely accommodate the fluid flow. While it is fundamentally possible for part of the fluid flow to flow past the partial pipes and, for example, flow around them as a surrounding flow, it is preferred that the fluid flow is completely divided into the individual partial fluid flows. This design of the pipe section therefore enables the area around the partial pipes to be completely sealed so that there is no longer any residual flow of the fluid flow around the partial pipes and thus outside these partial pipes. This allows the flow advantages according to the invention to be further improved in a more targeted manner. Therefore, a locally variable cross-sectional shape in the region of the constriction of two adjacent partial pipes in the area of the passage is also advantageous, for example in order to remain within a maximum available envelope volume.

[0025] It also brings advantages if, in a pipe section according to the invention, the at least two partial pipes have partial pipe outlet directions which impart a swirl to the partial fluid flows. This correlates in particular with a rotating extension, in the form of the already explained screw-like interweaving of the individual partial pipes with each other. As also already explained, such a swirl imparted to the partial fluid flows can be fed to a mixing function, so that the individual partial fluid flows mix with each other in the merging section. This serves in particular to mix with regard to any concentration differences and/or temperature differences that may be present. Alternatively, the geometric freedom of the arrangement according to the invention can also provide for the individual partial pipes to be wrapped in opposite directions. With such an embodiment, exactly the opposite effect would be achieved, namely a reduction or even an avoidance of a swirl in the flow.

[0026] It is also further advantageous if, in a pipe section according to the invention, the inlet section and/or the outlet section have a connection interface for a fluid-tight connection to a fluid guide system. Such a connection interface can be, for example, a pipe flange or flange section, which can offer a corresponding sealing connection option to straight-formed pipes. This makes it possible to retrofit existing pipes with a pipe section according to the invention and thus the advantages achievable according to the invention.

[0027] The present invention also relates to a pipeline for guiding a fluid flow, wherein at least one pipe section according to the present invention is provided. A pipeline according to the invention thus brings with it the same advantages as have been explained in detail with reference to a pipe section according to the invention.

[0028] Further advantages, features and details of the invention emerge from the following description, in which embodiments of the invention are described in detail with reference to the drawings. They show schematically:

[0029] Fig. 1 shows an embodiment of a classic pipe section,

[0030] Fig. 2 shows an embodiment of a pipe section according to the invention,

[0031] Fig. 3 shows a further embodiment of a pipe section according to the invention, [0032] Fig. 4 shows a further embodiment of a pipe section according to the invention, [0033] Fig. 5 shows a further embodiment of a pipe section according to the invention, [0034] Fig. 6 shows a further embodiment of a pipe section according to the invention, [0035] Fig. 7 shows an embodiment of a pipeline according to the invention,

[0036] Fig. 8 shows a further embodiment of a pipe section according to the invention, and [0037] Fig. 9 shows a further embodiment of a pipe section according to the invention.

[0038] Figure 1 shows a schematic representation of a pipe section 10 as used in known pipelines 100. Here, a fluid flow F is to be guided around a 90 degree curve. The pipe section 10 is designed as a bend for this purpose, which is curved along a central axis M by a radius of curvature KR. The fluid flow F enters the inlet section 20 via a connection interface 22 and thus follows the wall of the pipe section 10 to the outlet section 30, where a transfer and an outlet can take place via the connection interface 32. The fluid flow F is curved very strongly, particularly on the inner wall, i.e. at the top in Figure 1. This even narrower radius of curvature KR than is already the case for the pipe radius of curvature KR for the central axis M, means that with large fluid flows F, separation and the formation of turbulence can occur. This leads to disadvantages, which means that it is necessary to work with lower fluid flows F, larger curvature radii KR and larger flow cross-sections.

[0039] In order to solve the problems with the solutions in Figure 1, Figure 2 describes a possibility of a pipe section 10 according to the invention. Here, two partial pipes 50 have been integrated in the pipe section 10 of Figure 1. The fluid flow F again enters the pipe section 10 through the inlet section 20, but is there at least partially divided into two partial fluid flows TF via the dividing section 40. After being divided, each of these two partial fluid flows TF enters its own partial pipe 50 provided for this purpose and follows this to the outlet from the partial pipes 50 in the merging section 60. In this merging section 60, the partial fluid flows TF are again combined to form a common fluid flow F and reach the further pipeline 100 via the outlet section 30.

[0040] As can be clearly seen in Figure 2, the two partial pipes 50 are arranged in such a way that they each lead to an increased partial curvature radius TKR. The respective partial curvature radius TKR is larger than the pipe curvature radius KR, so that the flow load is reduced accordingly by the guidance of the partial fluid flow TF in the partial pipe 50.

[0041] In the embodiment of Figure 2, it can be seen that only a part of the fluid flow F is divided into the two partial fluid flows TF provided here. A part of a residual flow of the fluid flow F is guided in a known manner along the central axis M and thus around the partial pipes 50, the pipe section 30. Figure 2 also shows a geometrically simple solution for increasing the partial curvature radii TKR. The lower partial pipe 50 is hereby separated from the

Outer wall 12 to the inner wall 40, while the upper partial pipe 50 is guided in an intersecting and overlapping manner from the inner wall 40 to the outer wall 12. This is a particularly simple geometric design for achieving the enlarged partial curvature radii TKR.

[0042] Figure 2 also shows an arrangement of a jacket tube 70, which serves to guide the residual fluid flow and fluid flow F past the partial tubes 50. In addition, it serves to mechanically stabilize and protect the partial tubes 50 against mechanical damage.

[0043] Figure 3 shows a further development which, on the one hand, dispenses with the jacket tube 70. Without this jacket tube 70, the complete fluid flow F is divided into four different partial fluid flows TF. All partial fluid flows TF are thus equal in total to the entire fluid flow F and can be provided with the enlarged partial curvature radius TKR in the manner according to the invention.

[0044] Figure 4 shows a variant in which the flow cross sections of the partial pipes 50 are smaller than the total flow cross section of the pipe section 50. This can be advantageous for small flow quantities of the fluid flow F, since the effort and in particular the space required and the weight of the pipe section 10 can be reduced. In addition, a conical widening for the division and a conical reduction for the merging are provided here in order to keep the flow cross sections the same or essentially the same.

[0045] Figures 5 and 6 show possible rotational extensions for the individual partial pipes 50. This allows a view of the dividing section 40 on the left and the merging section 60 on the right. In Figure 5, a rotational extension of approximately 90 degrees occurs. The designations |, Il, Ill and IV represent the individual partial channels 50. Here it can be clearly seen that the partial channel 50 with the designation | extends from the roof wall 16 to the outer wall 12. The partial pipe 50 starting on the inner wall 14 with the designation Ill rotates in its extension to the bottom wall 18, while the partial pipe 50 with the reference symbol Il rotates from the bottom wall 18 to the inner wall 14. Not shown in Figures 5 and 6 is a possible stabilization between the partial pipes 50. Reinforcing ribs can be used here to support the individual partial pipes 50 against each other. It can also be clearly seen here that the flow cross-section of the partial pipes 50 is reduced to around 60% compared to the jacket pipe 70, so that around 40% of the volume is available for the stabilizing elements. In addition to foaming the gaps, a 3D printing process for the formation of such stabilization ribs could be conceivable.

[0046] In Figures 5 and 6 it can also be clearly seen that the intertwined arrangement of the partial tubes 50 allows for an additional extension in the vertical direction.

[0047] Figure 6 shows a similar representation to Figure 5, but here a rotating extension of 180 degrees is provided, as can be clearly seen from the reference symbols | to IV.

[0048] Figure 7 shows an embodiment of a pipeline 100 according to the invention. Here, a pipe section 10 is provided for deflecting around an edge, which can, for example, have one of the embodiments of Figures 2 to 6. The above explanation of the embodiments describes the present invention exclusively in the context of examples.

[0049] Figures 8 and 9 show variants which provide an oppositely equal entanglement with five partial tubes 50. In particular, a twist is deliberately avoided here. Figure 9 also shows stabilizing ribs 52 between the partial tubes 50.

REFERENCE SYMBOL LIST

10 pipe sections

12 outer wall

14 inner wall

16 roof wall

18 bottom wall

20 inlet section

22 Connection interface 30 Outlet section

32 Connection interface 40 Distribution section

50 partial pipe

52 Stabilizing ribs 60 Merging section 70 Casing pipe

100 pipelines

F fluid flow

TF partial fluid flow

KR Pipe curvature radius TKR Partial curvature radius M Center axis

Claims (12)

patent claims 1. Pipe section (10) for guiding a fluid flow (F), having an inlet section (20) for the inlet of the fluid flow (F) and an outlet section (30) for the outlet of the fluid flow (F), wherein the pipe section (10) has a pipe curvature radius (KR) between the inlet section (20) and the outlet section (30), wherein downstream of the inlet section (20) a dividing section (40) is arranged for dividing the fluid flow (F) into at least two partial fluid flows (TF), wherein the dividing section (40) opens into at least two partial pipes (50) and divides a partial fluid flow (TF) into a partial pipe (50) each, and downstream the partial pipes (50) lead into a common merging section (60) which recombines the partial fluid flows (TF) into a common fluid flow (F), wherein furthermore the at least two partial pipes (50) between the dividing section (40) and the merging section (60) each have a partial radius of curvature (TKR) which is larger than the pipe radius of curvature (KR), wherein at least one partial pipe (50) is guided from an outer wall (12) of the pipe section (10) to an inner wall (14) and/or at least one partial pipe (50) is guided from an inner wall (14) of the pipe section (50) to an outer wall (12) and at least one partial pipe (50) is guided from an upper roof wall (16) of the pipe section (10) to a lower bottom wall (18) and/or at least one partial pipe (50) is guided from a lower bottom wall (18) of the pipe section (50) to an upper roof wall (16), characterized in that the partial pipes (50) are guided from the outer wall (12) to the inner wall (14), from the roof wall (16) to the bottom wall (18) and are combined with each other in a loop-like manner. 2, Pipe section (10) according to claim 1, characterized in that the at least two partial pipes (50) extend rotating around each other and/or rotating around a central axis (M) of the pipe section (10). 3. Pipe section (10) according to one of the preceding claims, characterized in that at least three partial pipes (50) are arranged between the dividing section (40) and the merging section (60). 4. Pipe section (10) according to one of the preceding claims, characterized in that the at least two partial pipes (50) have identical or substantially identical flow cross-sections. 5. Pipe section (10) according to one of the preceding claims, characterized in that the at least two partial pipes (50) have identical or substantially identical pipe lengths. 6. Pipe section (10) according to one of the preceding claims, characterized in that the at least two partial pipes (50) have identical or substantially identical partial radii of curvature (TKR). 7. Pipe section (10) according to one of the preceding claims, characterized in that the partial pipes (50) are surrounded by a jacket pipe (70). 8. Pipe section (10) according to one of the preceding claims, characterized in that the sum of the flow cross sections of the at least two partial pipes (50) corresponds or substantially corresponds to the flow cross section of the inlet section (20) and/or the outlet section (30). 9. Pipe section (10) according to one of the preceding claims, characterized in that the at least two partial pipes (50) are designed for complete or substantially complete reception of the fluid flow (F). 10. Pipe section (10) according to one of the preceding claims, characterized in that the at least two partial pipes (50) have partial pipe outlet directions which impart a swirl to the partial fluid flows (TF). 11. Pipe section (10) according to one of the preceding claims, characterized in that the inlet section (20) and/or the outlet section (30) have a connection interface (22, 32) for a fluid-tight connection to a fluid guide system. 12. Pipeline (100) for guiding a fluid flow (F), characterized by at least one pipe section (10) having the features of one of claims 1 to 11. 8 sheets of drawings