A branch plate flame stabilizer with alternate jet holes

Abstract

The present application relates to a kind of branch plate flame stabilizer with alternate arrangement of injection hole, and the branch plate flame stabilizer is mainly composed of V-type surface, vertical trailing edge and fuel injection port, 6-20 trapezoidal grooves are alternately arranged on both sides of the trailing edge of the branch plate flame stabilizer, so that the remaining vertical trailing edge forms alternate rectangular trailing edge, and 1-2 fuel injection ports are arranged on each rectangular trailing edge.The advantages and beneficial effects of the present application are that the branch plate flame stabilizer with alternate arrangement of injection hole is used in hypersonic combustion ramjet, and the combustion is more stable, the combustion speed is fast, and the total pressure loss is small.

Description

Technical Field

[0001] This invention relates to a flame stabilizer with alternating nozzle arrangements, 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 fuel-air 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 alternating nozzle arrangements, wherein trapezoidal 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 support plate flame stabilizer with alternating nozzle arrangements has 6 to 20 trapezoidal grooves alternately arranged on both sides of the tail of the support plate flame stabilizer, so that the remaining vertical tail edge forms an alternating rectangular tail edge, and 1 to 2 fuel nozzles are arranged on each rectangular tail edge.

[0007] Specifically, 6 to 12 trapezoidal grooves (3 to 6 on each side) are alternately arranged on both sides of the tail of the support plate flame stabilizer, so that the remaining vertical tail edge forms an alternating rectangular tail edge. One side has half a trapezoidal groove at both ends, and the other side has half a rectangular tail edge at both ends. Two fuel nozzles are arranged on each complete rectangular tail edge, and one fuel nozzle is arranged on each half rectangular tail edge.

[0008] Furthermore, the aforementioned support plate flame stabilizer has an extension determined by the specific engine, with a chord length of 30-50mm, and is mainly composed of a V-shaped surface, a vertical trailing edge, and a fuel nozzle; the included angle of the V-shaped surface is 10°-15°, and the height of the vertical trailing edge is 5-10mm.

[0009] Furthermore, the trapezoidal groove is an isosceles trapezoid in the top view, with the base of the trapezoid coinciding with the vertical tail edge. The length of the base of the trapezoid is obtained by dividing the length of the support plate by the number of grooves on both sides. The length of the top edge of the trapezoid is 2-5mm. The angle between the two waistlines of the trapezoid is 10°-30°. The height of the trapezoidal groove at the base of the trapezoid is half the height of the vertical tail edge. The angle between the bottom surface of the trapezoidal groove and the vertical tail edge is 85°-90°.

[0010] Furthermore, the fuel nozzle is circular with a diameter of 0.5 to 2 mm. The two fuel nozzles on the complete rectangular trailing edge are located at 1 / 2 height and 1 / 4 and 3 / 4 width, respectively, while the one fuel nozzle on the half rectangular trailing edge is located at the center of the half rectangular trailing edge.

[0011] Specifically, 12 to 20 trapezoidal grooves are alternately arranged on both sides of the tail of the support plate flame stabilizer, so that the remaining vertical tail edge forms an alternating rectangular tail edge, with one side starting with a trapezoidal groove and the other side starting with a rectangular tail edge, and one fuel nozzle is arranged on each rectangular tail edge.

[0012] Furthermore, the aforementioned support plate flame stabilizer has an extension determined by the specific engine, with a chord length of 30-50mm, and is mainly composed of a V-shaped surface, a vertical trailing edge, and a fuel nozzle; the included angle of the V-shaped surface is 10°-15°, and the height of the vertical trailing edge is 5-10mm.

[0013] Furthermore, the trapezoidal groove is an isosceles trapezoid in the top view, with the base of the trapezoid coinciding with the vertical tail edge. The length of the base of the trapezoid is obtained by dividing the length of the support plate by the number of grooves on both sides. The length of the top edge of the trapezoid is 1 to 2.5 mm. The angle between the two waistlines of the trapezoid is 0° to 7.5°. The height of the trapezoidal groove at the base of the trapezoid is half the height of the vertical tail edge. The angle between the bottom surface of the trapezoidal groove and the vertical tail edge is 85° to 90°. Based on this, the two trapezoidal grooves 4 at both ends of the support plate are excavated outward.

[0014] Furthermore, the fuel nozzle is circular with a diameter of 0.5 to 2 mm, and one fuel nozzle is located at the center of a rectangular trailing edge.

[0015] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0016] First, combustion is more stable. After alternating trapezoidal grooves on both sides of the tail of the conventional support plate flame stabilizer, a configuration is formed with one trapezoidal groove connected to three rectangular tail edges, and one rectangular tail edge connected to three trapezoidal grooves. Low-speed backflow is formed inside the trapezoidal grooves and behind the rectangular tail edges. A small amount of fuel is drawn into the trapezoidal grooves by the backflow and ignites and burns in the trapezoidal grooves when the chemical ratio is appropriate. Therefore, ignition is faster and combustion is more stable inside the trapezoidal grooves and behind the rectangular tail edges.

[0017] Secondly, the combustion speed is fast. After alternating trapezoidal grooves on both sides of the tail of a conventional support plate flame stabilizer, a configuration is formed where one trapezoidal groove connects to three rectangular tail edges, and one rectangular tail edge connects to three trapezoidal grooves. Low-speed backflow occurs within the trapezoidal grooves and behind the rectangular tail edges, causing a small amount of fuel to be drawn into the trapezoidal grooves and ignited within them, thus promoting rapid ignition and combustion near the tail of the support plate. When using a support plate tail configuration with alternating single nozzles, the combustion area is greatly increased. When using a support plate tail configuration with alternating double nozzles, not only is the combustion area increased, but the airflow from the diagonally opposite grooves on both sides forms a vortex near the tail of the support plate, resulting in large-scale convection transport, which further promotes combustion. Therefore, the support plate tail configuration with alternating nozzles allows the fuel to be completely burned within a short distance.

[0018] Third, the total pressure loss is small. Trapezoidal grooves are alternately arranged on both sides of the tail of the conventional support plate flame stabilizer. The support plate has no additional protruding structure and will not generate new shock wave structures. The total pressure loss caused by the flow disturbance of the trapezoidal grooves is very small. Therefore, compared with the conventional support plate flame stabilizer, the total pressure loss caused by this improvement is very small. Attached Figure Description

[0019] Figure 1 This is an isometric view of the first embodiment of the present invention.

[0020] Figure 2 This is a top view of the first embodiment of the present invention.

[0021] Figure 3 This is a bottom view of the first embodiment of the present invention.

[0022] Figure 4 This is a side view of the first embodiment of the present invention.

[0023] Figure 5 This is a front view of the first embodiment of the present invention.

[0024] Figure 6 This is a rear view of the first embodiment of the present invention.

[0025] Figure 7 This is the velocity streamline of the first embodiment of the present invention.

[0026] Figure 8 This is an isometric view of the second embodiment of the present invention.

[0027] Figure 9 This is a top view of the second embodiment of the present invention.

[0028] Figure 10 This is a bottom view of the second embodiment of the present invention.

[0029] Figure 11 This is a side view of the second embodiment of the present invention.

[0030] Figure 12 This is a front view of the second embodiment of the present invention.

[0031] Figure 13 This is a rear view of the second embodiment of the present invention.

[0032] Figure 14 This is the velocity streamline in the second embodiment of the present invention.

[0033] In the attached diagram, 1 is a V-shaped surface; 2 is a vertical trailing edge; 3 is a fuel nozzle; and 4 is a trapezoidal groove.

[0034] L1 is the span of the support plate flame stabilizer; L2 is the chord length of the support plate flame stabilizer; α1 is the included angle of the V-shaped surface; α2 is the included angle between the two waistlines of the trapezoidal groove; α3 is the included angle between the bottom surface of the trapezoidal groove and the vertical trailing edge; S1 is the length of the top edge of the trapezoidal groove; H1 is the height of the vertical trailing edge; H2 is the height of the trapezoidal groove at the bottom edge of the trapezoid; D is the diameter of the fuel nozzle. Detailed Implementation

[0035] The following will be combined with the appendix Figures 1-14 The present invention will be further described in detail with reference to the embodiments.

[0036] Example 1

[0037] like Figure 1-7 As shown, a support plate flame stabilizer with alternating nozzle arrangements has 6 to 12 trapezoidal grooves 4 (3 to 6 on each side) alternately arranged on both sides of the tail of the support plate flame stabilizer. In this embodiment, there are 8 grooves (4 on each side), so that the remaining vertical tail edge 2 forms an alternating rectangular tail edge. One side has half a trapezoidal groove 4 at both ends, and the other side has half a rectangular tail edge at both ends. Two fuel nozzles 3 are arranged on each complete rectangular tail edge, and one fuel nozzle 3 is arranged on each half rectangular tail edge.

[0038] As a further improvement to this embodiment of the invention, the flame stabilizer with a support plate has an extension L1 determined by the specific engine, specifically 50 mm in this embodiment, and a chord length L2 of 30–50 mm, specifically 32 mm in this embodiment. It mainly consists of a V-shaped surface 1, a vertical trailing edge 2, and a fuel nozzle 3. The included angle α1 of the V-shaped surface 1 is 10°–15°, specifically 12° in this embodiment, and the height H1 of the vertical trailing edge 2 is 5–10 mm, specifically 6.72 mm in this embodiment.

[0039] As a further improvement of this embodiment of the invention, the trapezoidal groove 4 is an isosceles trapezoid in the top view, with the base of the trapezoid coinciding with the vertical tail edge 2. The length of the base of the trapezoid is obtained by dividing the extension L1 of the support plate by the number of grooves on both sides. In this embodiment, it is 50mm / 8 = 6.25mm. The length S1 of the top edge of the trapezoid is 2 to 5mm, and in this embodiment, it is 3mm. The angle α2 between the two waistlines of the trapezoid is 10° to 30°, and in this embodiment, it is 20°. The height H2 of the base of the trapezoidal groove 4 is half the height H1 of the vertical tail edge 2. The angle α3 between the bottom surface of the trapezoidal groove 4 and the vertical tail edge 2 is 85° to 90°, and in this embodiment, it is 88°.

[0040] As a further improvement of the embodiment of the present invention, the fuel nozzle 3 is circular with a diameter D of 0.5 to 2 mm, specifically 1 mm in this embodiment. The two fuel nozzles 3 on the complete rectangular trailing edge are located at 1 / 2 height and 1 / 4 and 3 / 4 width, respectively, while the one fuel nozzle 3 on the half rectangular trailing edge is located at the center of the half rectangular trailing edge.

[0041] Example 2

[0042] like Figure 8-14 As shown, a support plate flame stabilizer with alternating nozzle arrangements has 12 to 20 trapezoidal grooves 4 (6 to 10 on each side) alternately arranged on both sides of the tail of the support plate flame stabilizer. In this embodiment, there are 16 grooves (8 on each side), so that the remaining vertical tail edge 2 forms an alternating rectangular tail edge, with one side starting with a trapezoidal groove 4 and the other side starting with a rectangular tail edge. One fuel nozzle 3 is arranged on each rectangular tail edge.

[0043] As a further improvement to this embodiment of the invention, the flame stabilizer with a support plate has an extension L1 determined by the specific engine, specifically 50 mm in this embodiment, and a chord length L2 of 30–50 mm, specifically 32 mm in this embodiment. It mainly consists of a V-shaped surface 1, a vertical trailing edge 2, and a fuel nozzle 3. The included angle α1 of the V-shaped surface 1 is 10°–15°, specifically 12° in this embodiment, and the height H1 of the vertical trailing edge 2 is 5–10 mm, specifically 6.72 mm in this embodiment.

[0044] As a further improvement to this embodiment of the invention, the trapezoidal groove 4 is an isosceles trapezoid in top view, with the base of the trapezoid coinciding with the vertical tail edge 2. The length of the base of the trapezoid is obtained by dividing the extension L1 of the support plate by the number of grooves on both sides; in this embodiment, it is specifically 50mm / 16 = 3.125mm. The length S1 of the top edge of the trapezoid is 1 to 2.5mm; in this embodiment, it is specifically 1.5mm. The angle α2 between the two waistlines of the trapezoid is 0° to 7.5°; in this embodiment, it is specifically 5°. The height H2 of the base of the trapezoidal groove 4 is half the height H1 of the vertical tail edge 2. The angle α3 between the bottom surface of the trapezoidal groove 4 and the vertical tail edge 2 is 85° to 90°; in this embodiment, it is specifically 88°. Furthermore, the two trapezoidal grooves 4 at both ends of the support plate are excavated outwards.

[0045] As a further improvement of the present invention, the fuel nozzle 3 is circular with a diameter D of 0.5 to 2 mm, specifically 1 mm in this embodiment, and one fuel nozzle 3 is located at the center of a rectangular trailing edge.

[0046] 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 alternating nozzle arrangements on a support plate, characterized in that, Six to twelve or twelve to twenty trapezoidal grooves (4) are alternately arranged on both sides of the tail of the support plate flame stabilizer, so that the remaining vertical tail edge (2) forms an alternating rectangular tail edge, and one to two fuel nozzles (3) are arranged on each rectangular tail edge. The flame stabilizer of the support plate has an extension determined by the specific engine, with a chord length of 30~50mm. It is mainly composed of a V-shaped surface (1), a vertical trailing edge (2), and a fuel nozzle (3). The included angle of the V-shaped surface (1) is 10°~15°, and the height of the vertical trailing edge (2) is 5~10mm. The trapezoidal groove (4) is an isosceles trapezoid in the top view. The base of the trapezoid coincides with the vertical tail edge (2). The length of the base of the trapezoid is obtained by dividing the length of the support plate by the number of grooves on both sides. The height of the base of the trapezoidal groove (4) is half the height of the vertical tail edge (2). The angle between the bottom surface of the trapezoidal groove (4) and the vertical tail edge (2) is 85°~90°. The fuel nozzle (3) is circular with a diameter of 0.5~2mm. When 6 to 12 trapezoidal grooves (4) are alternately arranged on both sides of the tail of the flame stabilizer, one side has half a trapezoidal groove (4) at both ends, and the other side has half a rectangular tail edge at both ends. Two fuel nozzles (3) are arranged on each complete rectangular tail edge, and one fuel nozzle (3) is arranged on the half rectangular tail edge. The top side of the trapezoid is 2 to 5 mm long, and the angle between the two waistlines of the trapezoid is 10° to 30°. The two fuel nozzles (3) on the complete rectangular tail edge are located at 1 / 2 height and 1 / 4 and 3 / 4 width, respectively, while the one fuel nozzle (3) on the half rectangular tail edge is located at the center of the half rectangular tail edge. When 12 to 20 trapezoidal grooves (4) are alternately arranged on both sides of the tail of the flame stabilizer, one side starts with the trapezoidal groove (4) and the other side starts with the rectangular tail edge. A fuel nozzle (3) is arranged on each rectangular tail edge. The top side of the trapezoid is 1 to 2.5 mm long, the angle between the two waist lines of the trapezoid is 0° to 7.5°, and a fuel nozzle (3) is located at the center of a rectangular tail edge.

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