A flame stabilizer with a support plate and a V-shaped groove

Abstract

This invention relates to a flame stabilizer with V-shaped grooves. The flame stabilizer consists of a V-shaped surface, a straight section, a vertical trailing edge, and a nozzle. Three to five V-shaped grooves are arranged on both sides of the flame stabilizer. The advantages and beneficial effects of this invention are: when used in a scramjet combustion chamber, this flame stabilizer with V-shaped grooves results in fast combustion speed and low flow resistance loss.

Description

Technical Field

[0001] This invention relates to a flame stabilizer with a V-shaped groove, which can be used in the combustion chamber of a scramjet engine, and belongs to the field of aerospace technology. Background Technology

[0002] Scramjet engines, due to their superior performance at high Mach numbers, have gradually become the preferred propulsion system for hypersonic vehicles, attracting the attention of major aerospace powers. Because the residence time of the airflow within the scramjet combustor is extremely short, maximizing the conversion of the fuel's chemical energy into thermal energy within a limited space and time is one of the key technologies in scramjet combustor research. Scramjet combustors typically employ a stator flame stabilizer to create a recirculation zone, increasing fuel mixing and the residence and reaction time of the mixture, thereby improving combustion efficiency and shortening the length of the combustion zone. The stator flame stabilizer configuration is a significant factor influencing the performance of the scramjet combustor.

[0003] In conventional flame stabilizers, the fuel jet is parallel to the supersonic incoming flow, resulting in relatively poor fuel distribution and mixing efficiency in space. This leads to a longer complete combustion distance and severely affects the expansion of combustion products. Stabilizers with staggered tail structures and tail wedge structures enhance fuel convection and diffusion by introducing large-scale flow vortices into the flow field. However, the recirculation zone of such stabilizers is significantly reduced, and the flow vortices can cause combustion instability, thus affecting the reaction process. At the same time, the total pressure loss of the combustion chamber also increases sharply, severely impacting the performance of the scramjet combustor. Summary of the Invention

[0004] The purpose of this invention is to provide a support plate flame stabilizer with V-shaped grooves. V-shaped grooves are arranged on both sides of the support plate flame stabilizer to shorten the fuel complete combustion distance, expand the combustion area, and keep the total pressure loss within an acceptable range.

[0005] The present invention is achieved through the following technical solution.

[0006] A flame stabilizer with V-shaped grooves has 3 to 5 V-shaped grooves arranged on both sides of the flame stabilizer.

[0007] Furthermore, the aforementioned support plate flame stabilizer has a chord length of 30–100 mm, with the span determined by the specific engine. It mainly consists of a V-shaped surface, a straight section, a vertical trailing edge, and a nozzle. The V-shaped surface has an included angle of 10°–20°. The straight section has a chord length of 0–50 mm in the support plate flame stabilizer, and the vertical trailing edge has a height of 6–20 mm. A nozzle with a diameter of 0.4–3.5 mm is arranged in the middle of the vertical trailing edge, and the distance between adjacent nozzles is 3.4–12.5 mm.

[0008] Furthermore, the V-shaped groove is composed of a front V-shaped surface, a rear V-shaped surface, and a bottom surface. The bottom surface is perpendicular to the vertical tail edge, the height of the tail is 0.15 to 0.25 times the height of the vertical tail edge, and the distance between adjacent V-shaped grooves is 12 to 20 mm.

[0009] Furthermore, the included angle of the front V-shaped surface is 30° to 65°, the radius of the top rounded corner is 1 to 2 mm, the distance from the top to the vertical tail edge is 10 to 15 mm, and the width of the tail in the support plate flame stabilizer is 10 to 14 mm.

[0010] Furthermore, the rear V-shaped surface has an included angle of 20° to 55°, a top rounded corner radius of 0.5 to 1.5 mm, a top distance of 5 to 10 mm from the vertical tail edge, and a tail width of 4 to 10 mm in the span direction of the support plate flame stabilizer.

[0011] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0012] First, it has a fast combustion speed. After arranging V-shaped grooves on both sides of the conventional support plate flame stabilizer, a counter-rotating flow vortex is introduced, which can enhance the heat and mass convection transfer between the mainstream and the backflow, thereby promoting fuel-air mixing and increasing the flame propagation speed, thus accelerating combustion.

[0013] Second, the flow resistance loss is small. To achieve the same fuel-air mixing rate and combustion rate, the flow resistance loss caused by arranging V-shaped grooves on both sides of a conventional flame stabilizer is smaller compared to increasing the trailing edge height of a conventional flame stabilizer. Attached Figure Description

[0014] Figure 1 This is an isometric view of a conventional support plate flame stabilizer.

[0015] Figure 2 This is an isometric view of the flame stabilizer with V-shaped grooves in this invention.

[0016] Figure 3 This is a side view of the flame stabilizer with a V-shaped groove in the support plate of the present invention.

[0017] Figure 4 This is a top view of the flame stabilizer with V-shaped grooves in the present invention.

[0018] Figure 5 This is a front view of the flame stabilizer with a V-shaped groove in the support plate of the present invention.

[0019] Figure 6 This is a rear view of the flame stabilizer with a V-shaped groove in the support plate of the present invention.

[0020] Figure 7 This is the temperature distribution of the transverse cross section of the flame stabilizer with V-shaped grooves in this invention.

[0021] Figure 8 This is the temperature distribution of the transverse cross section of the flame stabilizer without V-grooves in this invention.

[0022] Figure 9 This is a streamline diagram of the transverse cross-section of the flame stabilizer with V-shaped groove in this invention.

[0023] In the attached diagram, 1 represents the V-shaped surface; 2 represents the straight section; 3 represents the vertical trailing edge; 4 represents the nozzle; 5 represents the front V-shaped surface; and 6 represents the rear V-shaped surface. L1 represents the chord length of the support plate flame stabilizer; L2 represents the span of the support plate flame stabilizer; L3 represents the chord length of the straight section of the support plate flame stabilizer; L4 represents the distance between adjacent nozzles; α1 represents the included angle of the V-shaped surfaces; α2 represents the included angle of the front V-shaped surfaces; α3 represents the included angle of the rear V-shaped surfaces; S1 represents the distance from the top of the front V-shaped surface to the vertical trailing edge; S2 represents the spanwise width of the tail of the front V-shaped surface within the support plate flame stabilizer; S3 represents the spanwise width of the tail of the rear V-shaped surface within the support plate flame stabilizer; S4 represents the distance from the top of the rear V-shaped surface to the vertical trailing edge; S5 represents the distance between adjacent V-shaped grooves; R1 represents the radius of the top fillet of the front V-shaped surface; R2 represents the radius of the top fillet of the rear V-shaped surface; H represents the height of the vertical trailing edge; h represents the height of the tail of the V-shaped groove; and D represents the nozzle diameter. Detailed Implementation

[0024] The following will be combined with the appendix Figures 1-6 The present invention will be further described in detail with reference to the embodiments.

[0025] A flame stabilizer with V-shaped grooves has 3 to 5 V-shaped grooves arranged on both sides of the flame stabilizer, and in this embodiment there are 4 grooves.

[0026] As a further improvement of this embodiment of the invention, the flame stabilizer with a support plate has a chord length L1 of 30-100 mm, specifically 32 mm in this embodiment, and an aspect ratio L2 determined by the specific engine, specifically 50 mm in this embodiment. It consists of a V-shaped surface 1, a straight section 2, a vertical trailing edge 3, and a nozzle 4. The included angle α1 of the V-shaped surface 1 is 10°-20°, specifically 12° in this embodiment. The chord length L3 of the straight section 2 in the flame stabilizer is 0-50 mm, specifically 0 mm in this embodiment. The height H of the vertical trailing edge 3 is 6-20 mm, specifically 6.72 mm in this embodiment. A nozzle 4 is arranged in the middle of the vertical trailing edge 3, with a diameter D of 0.4-3.5 mm, specifically 1 mm in this embodiment. The spacing L4 between adjacent nozzles 4 is 3.4-12.5 mm, specifically 3.4 mm in this embodiment.

[0027] As a further improvement of the embodiment of the present invention, the V-shaped groove is composed of a front V-shaped surface 5, a rear V-shaped surface 6 and a bottom surface. The bottom surface is perpendicular to the vertical tail edge 3. The height h of the tail is 0.15 to 0.25 times the height H of the vertical tail edge 3. In this embodiment, it is specifically 0.2 times. The distance S5 between adjacent V-shaped grooves is 12 to 20 mm. In this embodiment, it is specifically 12 mm.

[0028] As a further improvement of this embodiment of the invention, the included angle α2 of the front V-shaped surface 5 is 30° to 65°, specifically 43° in this embodiment; the radius of the top rounded corner R1 is 1 to 2 mm, specifically 1.5 mm in this embodiment; the distance S1 from the top to the vertical tail edge 3 is 10 to 15 mm, specifically 10 mm in this embodiment; and the span width S2 of the tail end in the support plate flame stabilizer is 10 to 14 mm, specifically 10 mm in this embodiment.

[0029] As a further improvement of this embodiment of the invention, the included angle α3 of the rear V-shaped surface 6 is 20° to 55°, specifically 30° in this embodiment; the radius of the top rounded corner R2 is 0.5 to 1.5 mm, specifically 1.2 mm in this embodiment; the distance S4 from the top to the vertical tail edge 3 is 5 to 10 mm, specifically 5.9 mm in this embodiment; and the span of the tail end in the flame stabilizer of the support plate is 4 to 10 mm, specifically 5 mm in this embodiment.

[0030] The embodiments described above are merely preferred embodiments of the present invention and not an exhaustive list of all possible implementations of the present invention. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A flame stabilizer with a support plate and a V-shaped groove, characterized in that, Three to five V-shaped grooves are arranged on both sides of the flame stabilizer. The flame stabilizer with a support plate has a chord length of 30-100mm and an extension length determined by the specific engine. It is mainly composed of a V-shaped surface (1), a straight section (2), a vertical trailing edge (3), and a nozzle (4). The V-shaped surface (1) has an included angle of 10°-20°. The straight section (2) has a chord length of 0-50mm in the flame stabilizer. The vertical trailing edge (3) has a height of 6-20mm. A nozzle (4) is arranged in the middle of the vertical trailing edge (3). The nozzle (4) has a diameter of 0.4-3.5mm and a spacing of 3.4-12.5mm between adjacent nozzles (4). The V-shaped groove is composed of a front V-shaped surface (5), a rear V-shaped surface (6), and a bottom surface. The bottom surface is perpendicular to the vertical tail edge (3). The height of the tail is 0.15 to 0.25 times the height of the vertical tail edge (3). The distance between adjacent V-shaped grooves is 12 to 20 mm. The included angle of the front V-shaped surface (5) is 30° to 65°. The radius of the top rounded corner is 1 to 2 mm. The distance from the top to the vertical tail edge (3) is 10 to 15 mm. The width of the tail in the support plate flame stabilizer is 10 to 14 mm. The included angle of the rear V-shaped surface (6) is 20° to 55°. The radius of the top rounded corner is 0.5 to 1.5 mm. The distance from the top to the vertical tail edge (3) is 5 to 10 mm. The width of the tail in the support plate flame stabilizer is 4 to 10 mm.

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