A strut flame stabilizer with out-toe ribs

Abstract

The present invention relates to a strut flame stabilizer with outwardly splayed ribs. The strut flame stabilizer is composed of a V-shaped surface, a straight section, a vertical trailing edge, and a nozzle. 3 to 5 pairs of outwardly splayed ribs are arranged on both side surfaces of the strut flame stabilizer. The advantages and beneficial effects achieved by the present invention are as follows: When the combustion chamber of a scramjet engine adopts the strut flame stabilizer with outwardly splayed ribs, the combustion area is large, the combustion speed is fast, and the flow resistance loss is small.

Description

Technical Field

[0001] The present invention relates to a strut flame stabilizer with outwardly splayed ribs, which can be used in the combustion chamber of a scramjet engine and belongs to the field of aviation technology. Background Art

[0002] Due to its excellent performance at high Mach numbers, the scramjet engine has gradually become the preferred propulsion system form for hypersonic vehicles and has attracted the attention of major aerospace countries. The scramjet combustion technology is one of its key technologies. In the scramjet combustion chamber, the airflow flows at supersonic speed, and the residence time of the fuel in the combustion chamber is on the order of milliseconds. This requires the fuel to complete the mixing with the oncoming flow, ignition, form a diffusion flame and spread to the entire flow field within a short time to form a stable and efficient combustion field. The scramjet combustion chamber usually uses a strut flame stabilizer to establish a recirculation zone to stabilize the flame and organize combustion. The trailing edge structure of the strut flame stabilizer is a decisive factor affecting the performance of the scramjet combustion chamber.

[0003] In a conventional strut flame stabilizer, the jet is parallel to the supersonic oncoming flow, and the distribution and mixing efficiency of the fuel in space are relatively poor, which in turn affects the combustion reaction process, resulting in a longer complete combustion distance and seriously affecting the expansion degree of the gas. The strut with a lobe structure at the trailing edge can effectively improve the mixing ability of the fuel and the mainstream by inducing streamwise vortices and promote the lateral diffusion of the flame in the combustion chamber. However, the recirculation zone range of this type of strut is significantly reduced, the flame stabilization ability is weakened, and instantaneous flameout is likely to occur in the combustion flow field. At the same time, the total pressure loss of the combustion chamber also increases sharply, thus seriously affecting the performance of the scramjet combustion chamber. Summary of the Invention

[0004] The purpose of the present invention is to provide a strut flame stabilizer with outwardly splayed ribs, and outwardly splayed ribs are arranged on both sides of the strut flame stabilizer to improve the mixing efficiency of the fuel, expand the combustion area, shorten the complete combustion distance of the combustion chamber, and keep the total pressure loss within an acceptable range.

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

[0006] A strut flame stabilizer with outwardly splayed ribs, and 3 - 5 pairs of outwardly splayed ribs are arranged on both sides of the strut flame stabilizer.

[0007] Furthermore, for the strut flame stabilizer, the chord length is 30 - 100 mm, the span is determined by the specific engine, and it mainly consists of a V-shaped surface, a straight section, a vertical trailing edge, and a nozzle. The included angle of the V-shaped surface is 10° - 20°, the straight section is 0 - 50 mm in the chord direction of the strut, the height of the vertical trailing edge is 3 - 20 mm, a nozzle is arranged in the middle of the vertical trailing edge, the diameter of the nozzle is 0.4 - 3.5 mm, and the spacing between adjacent nozzles is 2.4 - 12.5 mm.

[0008] Furthermore, the outward splayed ribs are cuboid-shaped, with a height of 1 - 3 mm, a thickness of 1 - 2 mm, and a length of 5 - 10 mm. The outward splayed ribs are installed in an outward splayed manner, with an installation angle of 35° - 45°. The inner distance between the trailing edges of the ribs is 2 - 4 mm, the distance between adjacent pairs of outward splayed ribs is 1 - 3 mm, and the distance from the outer side of the trailing edge of the outward splayed ribs to the trailing edge of the support plate is 1 - 3 mm.

[0009] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0010] First, the combustion area is large. In a conventional strut flame stabilizer, a recirculation zone is generated at the tail, and the interaction between the recirculation zone and the mainstream on both sides is weak. After arranging outward splayed ribs on both sides of the conventional strut flame stabilizer, counter-rotating streamwise vortices are generated, strengthening the heat and mass convective transport between the combustion core region and the mainstream on both sides, thus expanding the combustion area.

[0011] Second, the combustion speed is fast. The pair of outward splayed ribs generates counter-rotating streamwise vortices, which is conducive to the heat and mass convective transport between the combustion core region and the mainstream on both sides, thereby increasing the flame propagation speed and achieving stable and efficient combustion behind the recirculation zone.

[0012] Third, the flow resistance loss is small. To achieve the same combustion area and combustion speed, compared with introducing a lobe structure at the trailing edge of a conventional strut flame stabilizer, arranging outward splayed ribs on both sides of the conventional strut flame stabilizer causes less flow resistance loss. Description of the Drawings

[0013] Figure 1 Isometric view of the strut flame stabilizer with outward splayed ribs in the present invention.

[0014] Figure 2 Side view of the strut flame stabilizer with outward splayed ribs in the present invention.

[0015] Figure 3 Top view of the strut flame stabilizer with outward splayed ribs in the present invention.

[0016] Figure 4 Front view of the strut flame stabilizer with outward splayed ribs in the present invention.

[0017] Figure 5 Rear view of the strut flame stabilizer with outward splayed ribs in the present invention.

[0018] Figure 6 Temperature distribution of the downstream transverse section of the strut flame stabilizer with outward splayed ribs in the present invention.

[0019] Figure 7 Temperature distribution of the downstream transverse section of the conventional strut flame stabilizer in the present invention.

[0020] Figure 8 This is the streamline diagram of the downstream transverse section of the strut flame stabilizer with outwardly splayed ribs in the present invention.

[0021] In the attached drawings, 1 is the V-shaped surface, 2 is the straight section, 3 is the vertical trailing edge, 4 is the nozzle, and 5 is the outwardly splayed rib; L1 is the strut span, L2 is the strut chord length, L3 is the length of the straight section in the strut chord direction, L4 is the spacing between adjacent nozzles, L5 is the length of the outwardly splayed rib, H1 is the height of the vertical trailing edge, H2 is the height of the outwardly splayed rib, α1 is the V-shaped surface angle, α2 is the installation angle of the outwardly splayed rib, S1 is the inner spacing of the outwardly splayed rib to the trailing edge, S2 is the spacing between adjacent pairs of outwardly splayed ribs, S3 is the spacing between the outer side of the trailing edge of the outwardly splayed rib and the strut trailing edge, D is the nozzle diameter, and W is the thickness of the outwardly splayed rib. Detailed implementation mode

[0022] The following will combine the attached Figures 1 to 5 drawings and embodiments to further elaborate on the present invention.

[0023] A strut flame stabilizer with outwardly splayed ribs has 3 to 5 pairs of outwardly splayed ribs arranged on both sides of the strut flame stabilizer. In this embodiment, it is specifically 3 pairs.

[0024] As a further improvement of the embodiment of the present invention, the strut flame stabilizer has a chord length of 30 to 100 mm. In this embodiment, it is specifically 32 mm, and the span is determined by the specific engine. In this embodiment, it is specifically 50 mm, and it is 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 angle of 10° to 20°. In this embodiment, it is specifically 12°. The length of the straight section 2 in the strut chord direction is 0 to 50 mm. In this embodiment, it is specifically 9.5 mm. The height of the vertical trailing edge 3 is 3 to 20 mm. In this embodiment, it is specifically 4.72 mm. A nozzle 4 is arranged in the middle of the vertical trailing edge 3. The nozzle 4 has a diameter of 0.4 to 3.5 mm. In this embodiment, it is specifically 1 mm. The spacing between adjacent nozzles 4 is 2.4 to 12.5 mm. In this embodiment, it is specifically 3.4 mm.

[0025] As a further improvement of the embodiment of the present invention, the outwardly splayed rib 5 is in the shape of a cuboid, with a height of 1 to 3 mm. In this embodiment, it is specifically 1 mm, a thickness of 1 to 2 mm. In this embodiment, it is specifically 1 mm, and a length of 5 to 10 mm. In this embodiment, it is specifically 7 mm. The pairs of outwardly splayed ribs are installed in an outwardly splayed manner, with an installation angle of 35° to 45°. In this embodiment, it is specifically 40°. The inner spacing of the trailing edge is 2 to 4 mm. In this embodiment, it is specifically 2 mm. The spacing between adjacent pairs of outwardly splayed ribs is 1 to 3 mm. In this embodiment, it is specifically 2 mm. The distance between the outer side of the trailing edge of the outwardly splayed rib 5 and the strut trailing edge is 1 to 3 mm. In this embodiment, it is specifically 2 mm.

[0026] The above-described embodiments are only preferred embodiments of the present invention and not an exhaustive list of all possible embodiments of the present invention. For those of ordinary skill in the art, any obvious modifications made without departing from the principles and spirit of the present invention should be considered to be included within the scope of the claims of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the said claims.

Claims

1. A strut flame stabilizer with outward splayed ribs, characterized in that, Three to five pairs of outwardly angled ribs (5) are arranged on both side surfaces of the strut flame stabilizer; for the said strut flame stabilizer, the chord length is 30 - 100 mm, the span length is determined by the specific engine, and it is composed of a V-shaped surface (1), a straight section (2), a vertical trailing edge (3) and a nozzle (4). The included angle of the V-shaped surface (1) is 10° - 20°, the straight section (2) is 0 - 50 mm long in the chord direction of the strut, the vertical trailing edge (3) is 3 - 20 mm high, and a nozzle (4) is arranged in the middle of the vertical trailing edge (3). The diameter of the nozzle (4) is 0.4 - 3.5 mm, and the spacing between adjacent nozzles (4) is 2.4 - 12.5 mm; the said outwardly angled ribs (5) are cuboid-shaped, with a height of 1 - 3 mm, a thickness of 1 - 2 mm, and a length of 5 - 10 mm. The pairs of outwardly angled ribs are installed in an outwardly angled manner, with an installation angle of 35° - 45°, the inner spacing at the trailing edge is 2 - 4 mm, the spacing between adjacent pairs of outwardly angled ribs is 1 - 3 mm, and the outer side of the trailing edge of the outwardly angled ribs (5) is 1 - 3 mm away from the trailing edge of the strut.

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