CN113551261B - Wave V type flame stabilizer - Google Patents

Abstract

The invention relates to a wavy V-shaped flame stabilizer which consists of a wavy front edge, a wavy V-shaped surface and a wavy V-shaped tail edge. The advantages and the obtained beneficial effects of the invention are as follows: by adopting the wave-shaped V-shaped flame stabilizer, the flame stability is good, the flow loss is small, and the combustion efficiency is high.

Description

A wavy V-shaped flame stabilizer

technical field

The invention relates to a wave-shaped V-shaped flame stabilizer, which can be used in an afterburner of an aero-engine and belongs to the technical field of aviation.

Background technique

The afterburner of the jet aircraft engine adopts the flame stabilizer to stabilize the flame to organize the combustion. The performance of the flame stabilizer is the decisive factor affecting the performance of the afterburner. Most of the afterburners use V-shaped flame stabilizers with a simple structure. Although the conventional V-type flame stabilizer has a simple structure and is easy to manufacture, it produces a Karman vortex street type recirculation vortex, and its recirculation vortex stability is poor, resulting in poor flame stability and local combustion instability in some cases. The combustion efficiency, and the disturbance of the flow field caused by the alternate shedding of recirculating vortices also cause additional flow losses.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a wave-shaped V-shaped flame stabilizer to improve flame stability, reduce flow loss and increase combustion efficiency.

The present invention is realized through the following technical solutions.

A wave-shaped V-shaped flame stabilizer has wave-shaped geometric features, contains 3 to 5 wavelengths, and has the same cross-sectional shape everywhere. It is composed of leading edge, V-shaped surface and V-shaped trailing edge. In cross section, the leading edge is obtained by rounding the V-shaped surface. The included angle of the V-shaped trailing edge is 25°～40°, the width of the V-shaped trailing edge is 26-36mm, the front V-shaped included angle of the V-shaped trailing edge is 55°～70°, and the rear V-shaped included angle of the V-shaped trailing edge is 100°～150°. The width of the straight section on the side is 1.5-3mm. The wave-shaped geometric feature starts and ends at the crest position. The wave-shape is obtained by rounding the crest and trough of the sawtooth wave. The radius of the rounded corner is 15-30mm. The wave amplitude is 6 to 15 mm.

Compared with the prior art, the advantages of the present invention and the beneficial effects obtained are:

First, the flame stability is good. The conventional V-type flame stabilizer produces a Karman vortex street-type recirculation vortex, and its recirculation vortex is less stable. The conventional V-type flame stabilizer is changed to a wave-shaped V-type flame stabilizer, and then a K-H type recirculation vortex is generated, and the recirculation vortex has a component in the span. good sex.

Second, the flow loss is small. The conventional V-type flame stabilizer produces a Karman vortex street type recirculation vortex, and the wave-shaped V-type flame stabilizer produces a K-H type recirculation vortex. Compared with the Karman vortex street type recirculation vortex, the flow loss caused by the K-H type recirculation vortex is smaller. more, so the flow loss is small.

Third, the combustion efficiency is high. The wave-shaped V-shaped flame stabilizer produces K-H-type recirculation vortex, which has good flame stability. At the same time, the spanwise component of the recirculation vortex generates heat and mass convective transfer between the peak and trough recirculation areas, so that the fuel in the recirculation area is atomized and evaporated. And blending is more sufficient, thus ensuring stable and efficient combustion in the recirculation zone, so the combustion efficiency is high.

Description of drawings

Figure 1 is an isometric view of the wave V-shaped flame stabilizer of the present invention.

Figure 2 is a side view of the wave-shaped V-shaped flame stabilizer in the present invention.

FIG. 3 is a top view of the wave-shaped V-shaped flame stabilizer in the present invention.

Figure 4 is a front view of the wave-shaped V-shaped flame stabilizer of the present invention.

Figure 5 is a rear view of the wave-shaped V-shaped flame stabilizer of the present invention.

Fig. 6 is the longitudinal section V _X distribution of the wave-shaped V-shaped flame stabilizer in the present invention.

Fig. 7 is the V _X distribution of the transverse section of the wave-shaped V-shaped flame stabilizer in the present invention.

FIG. 8 is a streamline diagram of the wave-shaped V-shaped flame stabilizer in the present invention.

FIG. 9 is another view of the streamline diagram of the wave-shaped V-shaped flame stabilizer in the present invention.

In the drawings, 1 is the leading edge; 2 is the V-shaped surface; 3 is the V-shaped trailing edge.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings 1 to 5 and the embodiments.

A wave-shaped V-shaped flame stabilizer has a wave-shaped geometric feature, and contains 3 to 5 wavelengths. In this embodiment, there are 3 wavelengths, and the cross-sectional shapes are the same everywhere. The wave-shaped V-shaped flame stabilizer, The length is determined by the specific engine. In this embodiment, it is 180mm, which is mainly composed of leading edge 1, V-shaped surface 2, and V-shaped trailing edge 3. In cross section, the leading edge 1 is obtained by rounding the V-shaped surface 2. , the radius of the fillet is 1.5~5mm, this embodiment is 2.5mm, the width of V-shaped surface 2 is 20~30mm, this embodiment is 24mm, the V-shaped angle of V-shaped surface 2 is 25°~40°, this embodiment Specifically, it is 30°, the width of the V-shaped trailing edge 3 is 26 to 36 mm, and the embodiment is 30 mm. The front V-shaped angle of the V-shaped trailing edge 3 is 55° to 70°. The rear V-shaped included angle of the edge 3 is 100°～150°, which is 120° in this embodiment, and the width of the flat side section is 1.5～3mm, which is 2mm in this embodiment. Begin and end, the wave shape is obtained by rounding the crest and trough of the sawtooth wave, the fillet radius is 15-30mm, the embodiment is 18mm, the sawtooth wave amplitude is 6-15mm, and the embodiment is 12mm.

The above-mentioned embodiments are only preferred embodiments of the present invention, rather than an exhaustive list of feasible implementations of the present invention. For those skilled in the art, any obvious changes made to it without departing from the principle and spirit of the present invention should be considered to be included in the protection scope of the claims of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (2)

1. A wave-shaped V-shaped flame stabilizer is characterized by having wave-shaped geometrical characteristics, containing 3-5 wavelengths and having the same cross section shape at each part; the wavy V-shaped flame stabilizer mainly comprises a front edge (1), a V-shaped surface (2) and a V-shaped tail edge (3), wherein on the cross section, the front edge (1) is obtained by rounding the V-shaped surface (2), the radius of the fillet is 1.5-5 mm, the width of the V-shaped surface (2) is 20-30 mm, the V-shaped included angle of the V-shaped surface (2) is 25-40 degrees, the width of the V-shaped tail edge (3) is 26-36 mm, the front V-shaped included angle of the V-shaped tail edge (3) is 55-70 degrees, the rear V-shaped included angle of the V-shaped tail edge (3) is 100-150 degrees, and the width of a side flat section is 1.5-3 mm; the wave geometric characteristics start and end at the peak position, the wave is obtained by rounding off the peaks and the troughs of the sawtooth waves, the radius of the rounded corners is 15-30 mm, and the amplitude of the sawtooth waves is 6-15 mm.

2. The wavy V-shaped flame holder of claim 1, wherein the unfolding length of the wavy V-shaped flame holder is determined by a specific engine.

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