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EP3018359B1 - Fahrzeuggebläse mit optimierten lüfterflügeln für hohen durchfluss - Google Patents

Fahrzeuggebläse mit optimierten lüfterflügeln für hohen durchfluss Download PDF

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Publication number
EP3018359B1
EP3018359B1 EP15193292.8A EP15193292A EP3018359B1 EP 3018359 B1 EP3018359 B1 EP 3018359B1 EP 15193292 A EP15193292 A EP 15193292A EP 3018359 B1 EP3018359 B1 EP 3018359B1
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EP
European Patent Office
Prior art keywords
blade
span
propeller according
ventilation
propeller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15193292.8A
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English (en)
French (fr)
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EP3018359A1 (de
Inventor
Bruno Demory
Manuel Henner
Youssef BEDDADI
François Franquelin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Systemes Thermiques SAS
Original Assignee
Valeo Systemes Thermiques SAS
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Publication of EP3018359A1 publication Critical patent/EP3018359A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/307—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the tip of a rotor blade

Definitions

  • the field of the present invention is that of the automobile, and more particularly that of the circulation of air for the cooling of the engine equipment.
  • the vehicles with thermal engine need to evacuate the calories that generates their operation and for that they are equipped with heat exchangers, in particular cooling radiators, placed at the front of the vehicle and crossed by outside air.
  • heat exchangers in particular cooling radiators
  • a fan is placed upstream or downstream.
  • the ventilation fan which serves to force the flow of air has an axially oriented flow. It comprises blades connected by their foot to a central hub, and generally held together in their heads by a rotating shell (as illustrated in FIG. figure 1 ).
  • the propeller produce a large flow rate with respect to its diameter and speed of rotation, while operating with low pressure rises. Because of this operating point characteristic, it is necessary to design the propeller with large blades.
  • a central hub sometimes called a bowl
  • the diameters of the central bowl and the blades are typically in a ratio of 1 to 3.
  • the span of the blade that is to say its height from its foot to its end, corresponds to the height of the vein.
  • a properly configured blade must therefore produce at its downstream a total pressure (or dynamic pressure) relatively constant so that no secondary flow is established.
  • the document KR20130107442 A has a helix according to the preamble of claim 1.
  • the invention relates to a ventilation fan comprising a hub and blades extending radially outwardly from the hub between a blade root and a blade head, said blades having, in the twenty last percent of their wingspan, at least one rope the length of which is at least 1.5 times the shortest length of rope on the whole span of the blade, said shorter length being between 50 and 80 % of the span of the blade.
  • last twenty percents we mean the portion of the blade being between 80 and 100% of the span of the blade, from the blade root.
  • the length of the rope is at least 1.5 times the shortest rope length on the entire span of the blade, without necessarily being constant.
  • Such a condition may possibly be filled on a larger fraction of the span of the blade without departing from the scope of the invention.
  • such a condition will be fulfilled only on this distal part of the blade.
  • said rope over the last twenty percent is at least equal to 2 times said shorter rope length.
  • the rope is constantly decreasing from the blade root to said rope of shorter length and then constantly increasing from this point to the blade head.
  • the invention also relates to a ventilation propeller in which the blade comprises, in the last twenty percent, at least a portion of its line. mid-rope having a rear curvature.
  • the blade comprises, in the last twenty percent, at least a portion of its line. mid-rope having a rear curvature.
  • a portion of its mid-rope line has a rear curvature.
  • the blade comprises a maximum curvature, oriented towards the front, which is located between 50 and 80% of the span of the blade.
  • the curvature is constantly growing from the blade root to a maximum forward curvature and then constantly decreasing from this point to the blade head. More particularly, this decrease is greater than or equal to 7 °.
  • the invention also relates to a ventilation propeller in which the setting changes by at least +5 ° five or even the last 20 percent span of the blade. In other words, between the point located at 80% of the span of the blade and its end, the setting changes by at least +5 °.
  • the setting changes by at least + 10 ° between 33 and 75% of the span of the blade.
  • the wedging is less than 65 ° in the first third of the span.
  • the wedging is in constant decay of the blade root to a minimum setting located on the first third of the span then in constant growth from this point to the blade head.
  • the invention also relates to a ventilation propeller in which the blade comprises, in said last twenty percent, a superior camber or equal to 8%, in at least one point of its half-rope line.
  • the camber of the blade is greater than or equal to 8%, in at least one point of its mid-string line, without necessarily being constant.
  • Such a condition may optionally be filled on a larger fraction and / or on another fraction of the span of the blade without departing from the scope of the invention.
  • camber is between 8 and 10% throughout the last twenty percent.
  • camber is constant over the entire span of the blade.
  • the invention also relates to a motor-fan unit comprising a propeller as described above and a cooling system comprising such a motor-fan unit.
  • a motor-fan unit comprising a propeller as described above and a cooling system comprising such a motor-fan unit.
  • Such a system may include one or more heat exchangers traversed by the air flow generated by the propeller.
  • the figure 1 shows a propeller 1, of the prior art, which is rotatably mounted about an axis passing through its center O and here oriented orthogonally to the plane of the figure.
  • the direction of rotation of the helix 1 is designated by the arrow F.
  • the propeller 1 When the propeller 1 is rotated, for example by an electric motor (not visible), the propeller 1 brews the air which the crosses. The air flow then flows in a direction of flow oriented substantially axially.
  • upstream and downstream are understood with reference to the direction of flow of the air flow.
  • axial radial
  • tangential are themselves used with reference to the axis of rotation of the helix.
  • blades 3 are generally identical to each other and may have a substantially airfoil cross section, with an upper surface 3E and a lower surface 3I, as illustrated by FIG. figure 3 . They thus extend transversely between, respectively, a leading edge 31 which first comes into contact with the air flow during the rotation of the propeller 1, and a trailing edge 32 which is opposite to it.
  • the figure 2 gives the performance of a propeller according to the prior art as a function of the flow that passes through it, the latter being modulated by its rotational speed.
  • the curve P gives the pressure differences between the upstream and downstream of the helix 1 as a function of the flow rate passing through the helix, while the curve R gives the values of the yield of this helix under the same conditions. It is noted that the yields are of the order of 30 to 40% for the flow rates currently sought (between 1500 and 3000 m 3 / h) and that they collapse, as well as the pressure difference, as soon as the flow implemented rises, and in particular exceeds 2500 m 3 / h. The pressure difference would even become negative at very high flows (above 3000 m 3 / h), which results from recirculations and, therefore, from areas of the propeller that do not work from an aerodynamic point of view.
  • a fourth characteristic, which influences its aerodynamic performance is the curvature of the line which connects, in projection on a radial plane, the mid-rope points of the blade.
  • the curvature of the blade is said before if, for the rope considered, the tangent to this line is oriented, moving from the foot to the head, in the direction of rotation F; it is said to be backwards in the opposite direction.
  • the curvature, at each mid-cord point along the span, is expressed by the value in degrees of the angle made by the radius at this point with the radius of the half-rope point at the foot of the blade.
  • the figure 4 shows, in plan, an automobile fan propeller according to the invention. It comprises, here, seven blades and a ferrule, without these specific characteristics being essential for the realization of the invention.
  • the figure 5 gives a frontal view of a blade of such a helix.
  • the particular characteristics of this propeller are given by the Figures 6 to 9 , with respect to the evolution, respectively, of its rigging, its rope, its arch and its curvature, along its span.
  • the propeller that is represented on the Figures 4 and 5 integrates the particular features that are defined by the invention for these four parameters, but the invention relates to any of the possible combinations between the mentioned parameters, the latter may vary independently of each other. It nevertheless relates more particularly to the values that these parameters take in the last twenty percent of the span of the blade and the combinations between them in this range.
  • the figure 6 gives the optimal evolution, along the span of the blade, the angle of the rope with respect to the axial direction.
  • the value used according to the invention for setting is different from that which is usually used, namely that which is simply based on the velocity triangle.
  • the wedging given to the rope of the blade is defined by an aerodynamic incidence which is added to the direction resulting from the vector sum of the tangential and axial speeds of the fluid.
  • the setting takes locally a low value, which remains lower than 65 ° on all the first third of the span of the blade (from 0 to 33%). It has a minimum value on this range, which is referred to as reference Pt1. Then, it increases overall, between this first third and 75% of the blade span, with a Pt2 value at the end of the range (ie at 75%) which is at least + 10 ° greater than the minimum value Pt1 retained on the first third.
  • the wedging still increases over the last 25 percent span of the blade, with an increase in this segment that is greater than or equal to + 5 °, while remaining lower than 90 °.
  • the last two thirds which is at least 15 ° compared to the point of weakest wedging, the latter being positioned in the first third of the span of the blade.
  • figure 7 gives the optimal evolution, according to the invention, for the value of the rope, along the span of the blade.
  • the rope is globally decreasing from the blade root to the first half of its span. It then has a minimum that is placed in the range of 50 to 80% of the span, then it grows towards the blade head. It then takes a maximum value at a point beyond 80% wingspan.
  • the maximum value on the segment of the last twenty percent is, according to the invention, greater than one and a half times and, preferably, twice the minimum value of rope which has been found between 50 and 80% of span.
  • the figure 8 illustrates, then, the evolution according to the invention for the camber of the blade, along its wingspan.
  • the camber takes a value that is greater than 8% beyond 80% wingspan. In the mode illustrated in the figure, without this configuration is essential for the realization of the invention, the camber remains the same over the entire span, being greater than these 8%; the value used in this particular case, which corresponds to an optimum, is 9.5%.
  • figure 9 gives the evolution according to the invention for the curvature of the blade, along its span.
  • the curvature is zero at the foot, which means that the blade extends perpendicular to the hub 2.
  • the curvature gradually increases towards a curvature before becoming more pronounced, to reach a maximum value which is situated between 50 and 80% of the span. It then goes down again by at least 7 ° with respect to this maximum value to reach its value at the top of the blade.
  • the curvature passes in rear curvature in the zone of 80 to 100% of the blade. This results in the fact that the evolution of the angular position of the leading edge, translates a more retracted position of the blade head compared to the most advanced angular position between 0 and 80% span.
  • the minimum value of the curvature of the blade, at the head, is moreover advantageously lower by at least 7 ° to the maximum value of the curvature noted between 50 and 80% of span, with an overall decrease between this point and the head of the blade.
  • the yields reach values that can even exceed 50% at 2500 m 3 / h and, in any case, they remain higher than those obtained with the state of the art for a flow rate of 3500 m 3 / h.
  • the invention also relates to a motor-fan unit comprising such a propeller, and its drive motor.
  • Said group may comprise a nozzle provided with an air passage orifice inside which the helix rotates about its axis, said drive motor being carried by the nozzle by means of radial arms advantageously forming stator blades.
  • the invention also relates to a cooling system or module of a motor vehicle engine block. It then includes, in particular, the fan-motor group mentioned above and a cooling radiator.
  • the propeller may be located between the cooling radiator and the engine block or upstream of said radiator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (14)

  1. Lüfterrad (1), das eine Nabe (2) und Schaufeln (3) enthält, die sich ausgehend von der Nabe (2) zwischen einem Schaufelfuß (3a) und einem Schaufelkopf (3b) radial nach außen erstrecken, wobei die Schaufeln (3) in den letzten zwanzig Prozent ihrer Spannweite mindestens eine Sehne aufweisen, deren Länge mindestens gleiche dem 1,5-Fachen der kleinsten Sehnenlänge über die ganze Spannweite der Schaufel ist, dadurch gekennzeichnet, dass die kleinste Sehnenlänge zwischen 50 und 80% der Spannweite der Schaufel liegt.
  2. Lüfterrad nach Anspruch 1, wobei die Sehne über die letzten zwanzig Prozent mindestens gleich dem Doppelten der kleinsten Sehnenlänge ist.
  3. Lüfterrad nach einem der Ansprüche 1 und 2, wobei die Sehne vom Schaufelfuß (3a) bis zur Sehne kleinster Länge konstant abnimmt und dann von diesem Punkt bis zum Schaufelkopf (3b) konstant zunimmt.
  4. Lüfterrad nach einem der Ansprüche 1 bis 3, wobei die Schaufel in den letzten zwanzig Prozent mindestens einen Abschnitt ihrer Linie auf halber Sehne enthält, der eine Krümmung nach hinten hat.
  5. Lüfterrad nach Anspruch 4, wobei die Schaufel eine nach vorne gerichtete maximale Krümmung hat, die zwischen 50 und 80% der Spannweite der Schaufel liegt.
  6. Lüfterrad nach einem der Ansprüche 4 oder 5, wobei die Krümmung vom Schaufelfuß (3a) bis zu einer vorderen maximalen Krümmung konstant zunimmt und dann von diesem Punkt bis zum Schaufelkopf (3b) konstant abnimmt, wobei diese Abnahme größer als oder gleich 7° ist.
  7. Lüfterrad nach einem der Ansprüche 1 bis 6, wobei die Einstellung sich um mindestens +5° über die letzten fünfundzwanzig Prozent Spannweite der Schaufel entwickelt.
  8. Lüfterrad nach dem vorhergehenden Anspruch, wobei die Einstellung sich um mindestens +10° zwischen 33 und 75% der Spannweite der Schaufel entwickelt.
  9. Lüfterrad nach einem der Ansprüche 7 oder 8, wobei die Einstellung vom Schaufelfuß (3a) bis zu einer minimalen Einstellung (Pt1), die sich im ersten Drittel der Spannweite befindet, konstant abnimmt, dann von diesem Punkt bis zum Schaufelkopf (3b) konstant zunimmt.
  10. Lüfterrad nach einem der Ansprüche 1 bis 9, wobei die Schaufel in den letzten zwanzig Prozent eine Wölbung größer als oder gleich 8% an mindestens einem Punkt ihrer Linie auf halber Sehne aufweist.
  11. Lüfterrad nach Anspruch 10, wobei die Wölbung zwischen 8 und 10% entlang der ganzen letzten zwanzig Prozent liegt.
  12. Lüfterrad nach Anspruch 10, wobei die Wölbung über die ganze Spannweite der Schaufel konstant ist.
  13. Gebläseeinheit, die ein Lüfterrad (1) nach einem der vorhergehenden Ansprüche enthält.
  14. Kühlsystem eines Kraftfahrzeugs, das eine Gebläseeinheit nach dem vorhergehenden Anspruch und einen oder mehrere Wärmetauscher enthält, die von dem vom Lüfterrad erzeugten Luftstrom durchquert werden.
EP15193292.8A 2014-11-07 2015-11-05 Fahrzeuggebläse mit optimierten lüfterflügeln für hohen durchfluss Active EP3018359B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1460802A FR3028299B1 (fr) 2014-11-07 2014-11-07 Ventilateur pour automobile a pales optimisees pour les forts debits

Publications (2)

Publication Number Publication Date
EP3018359A1 EP3018359A1 (de) 2016-05-11
EP3018359B1 true EP3018359B1 (de) 2019-03-13

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EP15193292.8A Active EP3018359B1 (de) 2014-11-07 2015-11-05 Fahrzeuggebläse mit optimierten lüfterflügeln für hohen durchfluss

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FR (1) FR3028299B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7116459B2 (ja) * 2017-10-05 2022-08-10 国立研究開発法人宇宙航空研究開発機構 ダクテッドファン、マルチコプタ、垂直離着陸機、ｃｐｕ冷却用ファン及びラジエータ冷却用ファン

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5064345A (en) * 1989-11-16 1991-11-12 Airflow Research And Manufacturing Corporation Multi-sweep blade with abrupt sweep transition
US6241474B1 (en) * 1998-12-30 2001-06-05 Valeo Thermique Moteur Axial flow fan
DE69934489T2 (de) * 1999-09-07 2007-04-26 Lg Electronics Inc. Axiallüfter für Klimaanlage
US6814545B2 (en) * 2000-04-21 2004-11-09 Revcor, Inc. Fan blade
KR100820856B1 (ko) * 2003-03-05 2008-04-11 한라공조주식회사 축류팬
US8137070B2 (en) * 2010-03-10 2012-03-20 Robert Bosch Gmbh Skewed axial fan assembly
KR101472326B1 (ko) * 2012-03-22 2014-12-12 한라비스테온공조 주식회사 축류팬

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
EP3018359A1 (de) 2016-05-11
FR3028299B1 (fr) 2019-11-22
FR3028299A1 (fr) 2016-05-13

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