阅读说明：本技术 一种带新月沙丘型面的支板火焰稳定器 (Take extension board flame holder of crescent sand dune profile ) 是由 盛志强 于 2021-07-19 设计创作，主要内容包括：本发明涉及一种带新月沙丘型面的支板火焰稳定器,支板火焰稳定器主要由前缘、平直段、V型底面组成,在平直段两侧面都布置有3～5个新月沙丘型面。本发明的优点和取得的有益效果为：采用该带新月沙丘型面的支板火焰稳定器,火焰稳定性能好,火焰传播速度快,燃烧效率高,流阻损失小。(The invention relates to a supporting plate flame stabilizer with crescent sand dune molded surfaces, which mainly comprises a front edge, a flat section and a V-shaped bottom surface, wherein 3-5 crescent sand dune molded surfaces are arranged on two side surfaces of the flat section. The advantages and the obtained beneficial effects of the invention are as follows: the support plate flame stabilizer with the crescent sand dune profile has the advantages of good flame stability, high flame propagation speed, high combustion efficiency and small flow resistance loss.)

1. A supporting plate flame stabilizer with a crescent sand dune profile is characterized in that 3-5 crescent sand dune profiles (4) are arranged on two side faces of the supporting plate flame stabilizer; the supporting plate flame stabilizer mainly comprises a front edge (1), a straight section (2) and a V-shaped bottom surface (3), wherein the front edge (1) is an elliptical profile, the size of the major axis of the ellipse is 1.7-2.5 times of the minor axis, the front edge (1) is tangent and continuous with the straight section (2), the width of the straight section (2) is 24-36 mm, the included angle of the V-shaped bottom surface (3) is 100-150 degrees, the crescent sand dune profile (4) is 5-9 mm high, the connecting line of two sharp points of the crescent sand dune profile (4) is parallel to the tail edge of the support plate, the length of the connecting line of the sharp points is 35-45 mm, three curves of the crescent sand dune profile (4) are sample lines connecting the sharp points and the vertex, in the overlooking direction, the distances from the vertex to the connecting line of the sharp points are respectively 18-23 mm, 8.5-11 mm and 5.5-7.5 mm, the distance between adjacent crescent sand dune molded surfaces (4) is 50-65 mm, and the distance between the sharp points of the crescent sand dune molded surfaces (4) and the rear edge of the support plate is 5-20 mm.

2. The strut flame holder with a crescent dune profile as claimed in claim 1, wherein the strut flame holder has a chord length of 90-150 mm, and the span length is determined by the specific engine.

Technical Field

The invention relates to a support plate flame stabilizer with a crescent dune profile, which can be used for an integrated afterburner of an aircraft engine with a high thrust-weight ratio and belongs to the technical field of aviation.

Background

The new generation of afterburning turbofan engine pursues high thrust-weight ratio, and in the aspect of afterburning chambers, the engine requires concise parts, low cold flow resistance loss, small afterburning section length ratio and high afterburning efficiency. The afterburner adopts a flame stabilizer to stabilize flame tissue combustion, and the performance of the flame stabilizer is a decisive influence factor of the performance of the afterburner. Most of the new generation of afterburners adopt an integrated afterburner with a rectification support plate and a flame stabilizer which are integrally designed. However, the conventional strut plate flame stabilizer generates a karman vortex street type backflow vortex, and the backflow vortex has poor stability, so that local unstable combustion can be caused.

Because the length of the boost section is small, the distance from the fuel oil to the rear edge of the flame stabilizer is correspondingly reduced, the fuel oil is not sufficiently atomized, evaporated and mixed before being ignited, so that unstable combustion is easily caused, and the unstable combustion problem can be amplified after the fuel oil is overlapped with unstable combustion caused by backflow vortex, so that the combustion reaction process is influenced; the distance from the rear edge of the flame stabilizer to the outlet of the spray pipe is correspondingly reduced, the combustion section is shortened, the flame in a back flow region of the flame stabilizer is not in time to spread all over the whole combustion chamber, part of the oil-gas mixture is not fully combusted, and part of the oil-gas mixture is not involved in combustion and is directly discharged, so that the afterburning efficiency is seriously influenced.

Disclosure of Invention

The invention aims to provide a support plate flame stabilizer with crescent sand dune molded surfaces, wherein crescent sand dune molded surfaces are arranged on two side surfaces of the support plate flame stabilizer to improve flame stability and flame propagation speed, increase combustion efficiency and reduce flow resistance loss.

The invention is realized by the following technical scheme.

A supporting plate flame stabilizer with a crescent sand dune profile is characterized in that 3-5 crescent sand dune profiles are arranged on two side faces of the supporting plate flame stabilizer, the chord direction length of the supporting plate flame stabilizer is 90-150 mm, the spreading length is determined by a specific engine and mainly comprises a front edge, a straight section and a V-shaped bottom face, the front edge is an elliptical profile, the size of the long axis of the ellipse is 1.7-2.5 times of that of the short axis, the front edge and the straight section are tangent and continuous, the width of the straight section is 24-36 mm, the included angle of the V-shaped bottom face is 100-150 degrees, the crescent sand dune profile is 5-9 mm high, the connecting line of two sharp points of the crescent sand dune profile is parallel to the tail edge of the supporting plate, the connecting line of the sharp points is 35-45 mm long, three curves of the crescent sand dune profile are sample lines connecting the sharp points and the vertexes, and the distances from the vertex to the connecting line are respectively 18-23 mm, 8.5-11 mm, 5-7.5.5 mm and 50-65 mm between adjacent crescent sand dune profiles in the overlook direction, the distance between the sharp point of the profile of the crescent sand dune and the rear edge of the support plate is 5-20 mm.

Compared with the prior art, the invention has the advantages that:

first, flame stability is good. The conventional support plate flame stabilizer generates a Karman vortex street type backflow vortex, the stability of the backflow vortex is poor, and the problem of unstable combustion easily occurs. After crescent sand dune profiles are arranged on two sides of the conventional support plate flame stabilizer, K-H type backflow vortexes are generated, the stability of the backflow vortexes is enhanced, and a backflow area behind the crescent sand dune profiles is widened, so that the flame stability is better.

Second, the flame propagation speed is fast. After crescent sand dune profiles are arranged on two sides of the conventional support plate flame stabilizer, the crescent sand dune profiles can accelerate evaporation and mixing of fuel oil, so that backflow vortexes are changed into stable K-H-type backflow vortexes, the backflow vortexes have a span component, evaporation and mixing of the fuel oil are further promoted, and a backflow area behind the crescent sand dune profiles is widened, so that combustion is faster, and flame propagation speed is further improved.

Thirdly, the combustion efficiency is high. The crescent sand dune profile can accelerate evaporation and mixing of fuel oil, so that backflow vortex is changed into stable K-H type backflow vortex, the backflow vortex has an extensional component, evaporation and mixing of the fuel oil are further promoted, a backflow area behind the crescent sand dune profile is widened, therefore, combustion is faster, flame propagation speed is further improved, the crescent sand dune profile and the backflow area are overlapped, and higher combustion efficiency is obtained.

Fourth, the flow resistance loss is small. Compared with the conventional support plate flame stabilizer with increased width, the novel support plate flame stabilizer has the advantages that crescent sand dune molded surfaces are arranged on two sides of the conventional support plate flame stabilizer to achieve the same flame stabilization performance, flame propagation speed and combustion efficiency, so that the caused flow resistance loss is smaller, and the K-H backflow vortex replaces the karman vortex street type backflow vortex, thereby being beneficial to reducing the flow resistance loss.

Drawings

FIG. 1 is an isometric view of a strut flame holder with a crescent sand dune profile of the present invention.

FIG. 2 is a side view of the strut flame holder of the present invention with a crescent dune profile.

FIG. 3 is a top view of the strut flame holder of the present invention with a crescent dune profile.

FIG. 4 is a front view of the strut flame holder of the present invention with a crescent dune profile.

FIG. 5 is a rear view of the strut flame holder of the present invention with a crescent dune profile.

FIG. 6 is a longitudinal cross-section V of the strut flame holder of the present invention with crescent profile_XAnd (4) distribution.

FIG. 7 is a transverse section V of the strut flame holder of the present invention with crescent profile_XAnd (4) distribution.

FIG. 8 is a flow chart of a strut flame holder with crescent dune profiles of the present invention.

FIG. 9 is a flow diagram of another perspective of the strut flame holder of the present invention with a crescent dune profile.

In the drawings, 1 is the leading edge; 2 is a straight section; 3 is a V-shaped bottom surface; and 4, a crescent sand dune profile.

Detailed Description

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

A supporting plate flame stabilizer with crescent sand dune profiles is characterized in that 3-5 crescent sand dune profiles 4 are arranged on two side faces of the supporting plate flame stabilizer, specifically 3 in the embodiment, the chord direction length of the supporting plate flame stabilizer is 90-150 mm, specifically 120mm in the embodiment, the spreading length is determined by a specific engine, specifically 180mm in the embodiment, and mainly comprises a front edge 1, a straight section 2 and a V-shaped bottom surface 3, wherein the front edge 1 is an elliptical profile, the size of the elliptical major axis is 1.7-2.5 times of the minor axis, specifically 1.77 times of the embodiment, the front edge 1 is tangent and continuous with the straight section 2, the width of the straight section 2 is 24-36 mm, specifically 26mm in the embodiment, the included angle of the V-shaped bottom surface 3 is 100-150 degrees, specifically 120 degrees in the embodiment, the crescent sand dune profile 4 is 5-9 mm high, specifically 7mm in the embodiment, the connecting line of two points of the crescent sand dune profiles 4 is parallel to the tail edge of the supporting plate, the length of the sharp point connecting line is 35-45 mm, the length of the sharp point connecting line is 40mm in the embodiment, the three curves of the crescent sand dune profile 4 are sample lines connecting the sharp point and the vertex, the distances from the vertex to the sharp point connecting line are respectively 18-23 mm, 8.5-11 mm and 5.5-7.5 mm in the overlooking direction, the distances from the vertex to the sharp point connecting line are respectively 20mm, 9.5mm and 6.5mm in the embodiment, the distance between every two adjacent crescent sand dune profiles is 50-65 mm, the distance between every two adjacent crescent sand dune profiles is 60mm in the embodiment, the distance between the sharp point of the crescent sand dune profile 4 and the rear edge of the support plate is 5-20 mm, and the distance between the sharp point of the crescent sand dune profile 4 and the rear edge of the support plate is 10mm in the embodiment.

The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.