CN115930262A - Support plate flame stabilizer with U-shaped grooves - Google Patents

Abstract

The invention relates to a support plate flame stabilizer with a shoe-shaped groove. The support plate flame stabilizer is composed of a front edge, a straight section and a V-shaped bottom surface. groove. The advantages and beneficial effects of the invention are: the afterburner adopts the support plate flame stabilizer with shoe-shaped grooves, which has good flame stability, high combustion efficiency and small flow resistance loss.

Description

A support plate flame stabilizer with a shoe-shaped groove

technical field

The invention relates to a support plate flame stabilizer with a shoe-shaped groove, which can be used for an integrated afterburner of an aero-engine with a high thrust-to-weight ratio, and belongs to the field of aviation technology.

Background technique

The new-generation afterburning turbofan engine pursues a high thrust-to-weight ratio. In terms of the afterburner, it requires simple parts, low cold flow resistance loss, a small proportion of the length of the afterburner section, and high afterburner efficiency. The afterburner uses a flame stabilizer to stabilize the flame and organize combustion, and the performance of the flame stabilizer is a decisive factor affecting the performance of the afterburner. Most of the new generation of afterburning turbofan engines use an integrated afterburner with an integrated design of rectifying struts and flame stabilizers. However, the conventional support plate flame stabilizer produces Karman vortex street type recirculation vortex, which has poor stability and will lead to local unstable combustion.

Due to the small proportion of the length of the afterburner section, the distance from the fuel injection to the trailing edge of the flame stabilizer is correspondingly reduced, and the fuel atomization, evaporation and mixing are insufficient before being ignited, which easily leads to combustion instability and instability caused by the backflow vortex. After the combustion is superimposed, the problem of combustion instability will be magnified, which will affect the combustion reaction process; the distance from the rear edge of the flame stabilizer to the outlet of the nozzle will be correspondingly reduced, the combustion section will be shortened, and the flame in the recirculation area behind the flame stabilizer will not have time to spread throughout the entire combustion in the horizontal direction In the chamber, part of the oil-air mixture is not fully burned, and part of the oil-air mixture is directly discharged without participating in the combustion, thus seriously affecting the afterburner efficiency.

Contents of the invention

The object of the present invention is to provide a support plate flame stabilizer with a shoe-shaped groove, and the shoe-shaped grooves are arranged on both sides of the support plate flame stabilizer to improve flame stability, reduce flow loss and increase combustion efficiency.

The present invention is realized through the following technical solutions.

A support plate flame stabilizer with shoe-shaped grooves, 3 to 5 shoe-shaped grooves are evenly arranged on both sides of the support plate flame stabilizer.

Further, the support plate flame stabilizer has a chord length of 90 to 150 mm, and the spread length is determined by a specific engine, and is composed of a front edge, a straight section, and a V-shaped bottom surface. The front edge is an elliptical surface, and the major axis of the ellipse is short 1.7 to 2.5 times the axis, the front edge is tangent and continuous to the straight section, the width of the straight section is 24 to 36 mm, and the included angle of the V-shaped bottom surface is 100° to 150°.

Further, the tail edge of the shoe-shaped groove is flush with the tail edge of the support plate flame stabilizer, the tail edge of the shoe-shaped groove is 40-50mm long, and the height is 1-2mm. The angle between the surface of the straight section and the straight section is 10-20°, and the two leading edge curves of the shoe-shaped groove are both splines connecting the apex and the end point of the trailing edge. The distance from the apex to the trailing edge is 23-28 mm, and the distance from the apex to the trailing edge of the leading edge curve in the bottom surface is 20-25 mm.

Compared with prior art, advantage of the present invention and the beneficial effect that obtain are:

First, the flame stability is good. The conventional support plate flame stabilizer produces Karman vortex street type reflux vortex, the frequency of reflux vortex shedding is high, the stability of reflux vortex is poor, and combustion instability is prone to occur. Moreover, the distance from the fuel injection to the recirculation area is very short, and the evaporation and mixing of the fuel are not sufficient, which easily leads to unstable combustion. After the shoe-shaped grooves are arranged on both sides of the conventional support plate flame stabilizer, a cow-horn-shaped dwelling vortex is formed in the shoe-shaped grooves, which is beneficial to the evaporation and mixing of fuel oil; the shedding frequency of the Karman vortex street type return vortex behind the stabilizer It is much lower, and the stability of the reflux vortex is enhanced. Therefore, the flame stability performance is better after the shoe-shaped groove is arranged.

Second, the combustion efficiency is high. After the shoe-shaped grooves are arranged on both sides of the conventional support plate flame stabilizer, a cow-horn-shaped dwelling vortex is formed in the shoe-shaped grooves, which is beneficial to the evaporation and mixing of fuel oil; the shedding frequency of the Karman vortex street type return vortex behind the stabilizer It is much lower, and the stability of the reflux vortex is enhanced. Therefore, the arrangement of the shoe-shaped groove is conducive to obtaining more stable and efficient combustion, thereby achieving higher combustion efficiency.

Third, the flow resistance loss is small. To achieve the same flame stability performance and combustion efficiency, compared with increasing the plugging width of the conventional support plate flame stabilizer, arranging shoe-shaped grooves on both sides of the conventional support plate flame stabilizer will cause less flow resistance loss, and , reducing the shedding frequency of the Karman vortex street type return vortex is beneficial to reducing the loss of flow resistance.

Description of drawings

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an isometric view of a shoe-shaped grooved strut flame holder of the present invention.

Fig. 2 is a side view of a support plate flame stabilizer with a shoe-shaped groove in the present invention.

Fig. 3 is a top view of a support plate flame stabilizer with a shoe-shaped groove in the present invention.

Fig. 4 is a front view of a support plate flame stabilizer with a shoe-shaped groove in the present invention.

Fig. 5 is a rear view of a support plate flame stabilizer with a shoe-shaped groove in the present invention.

Fig. 6 is a longitudinal section V _X distribution of a conventional strut plate flame holder.

Fig. 7 is a cross-sectional V _X distribution of a conventional strut plate flame holder.

Fig. 8 is the longitudinal section V _X distribution of the support plate flame stabilizer with shoe-shaped groove in the present invention.

Fig. 9 is the cross-section V _X distribution of the support plate flame stabilizer with shoe-shaped grooves in the present invention.

Fig. 10 is the streamline diagram 1 of the support plate flame stabilizer with shoe-shaped groove in the present invention.

Fig. 11 is the second streamline diagram of the support plate flame stabilizer with shoe-shaped grooves in the present invention.

In the accompanying drawings, 1 is the front edge; 2 is the straight section; 3 is the V-shaped bottom surface; 4 is the shoe-shaped groove; L1 is the chord length of the support plate flame stabilizer; L2 is the shoe-shaped groove in the shoe-shaped groove The distance from the vertex of the leading edge curve in the bottom surface to the trailing edge; L3 is the distance from the vertex of the leading edge curve to the trailing edge of the shoe-shaped groove in the straight section surface; W1 is the width of the straight section; W2 is the shoe-shaped concave The height of the tail edge of the groove; H1 is the extension length of the flame stabilizer of the support plate; H2 is the length of the tail edge of the shoe-shaped groove; α is the included angle of the V-shaped bottom surface of the flame stabilizer of the support plate;

Detailed ways

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

A support plate flame stabilizer with shoe-shaped grooves, 3 to 5 shoe-shaped grooves 4 are evenly arranged on both sides of the support plate flame stabilizer, specifically 3 in this embodiment.

As a further improvement of the embodiment of the present invention, the support plate flame stabilizer has a chord length L1 of 90 to 150 mm, specifically 120 mm in this embodiment, and the extension H1 is determined by a specific engine, specifically 180 mm in this embodiment, as stated in the previous Edge 1, straight section 2, and V-shaped bottom surface 3. Front edge 1 is an elliptical surface. 2 is tangentially continuous, the width W1 of the straight section 2 is 24-36 mm, specifically 26 mm in this embodiment, and the included angle α of the V-shaped bottom surface 3 is 100°-150°, specifically 120° in this embodiment.

As a further improvement of the embodiment of the present invention, the trailing edge of the shoe-shaped groove 4 is flush with the trailing edge of the support plate flame stabilizer, and the length H2 of the trailing edge of the shoe-shaped groove is 40-50mm. This embodiment is specifically 46mm, the height w2 of the trailing edge of the hoof-shaped groove is 1-2mm, specifically 1mm in this embodiment, the front of the bottom of the hoof-shaped groove is low and the rear is high, and the angle with the surface of the straight section is 10-20°, and this embodiment is specifically 15 °, the two leading edge curves of the shoe-shaped groove are both splines connecting the apex and the trailing edge endpoint, and in the top view direction, the distance L3 from the vertex of the leading edge curve to the trailing edge in the straight section surface is 23~ 28 mm, specifically 25 mm in this embodiment, and the distance L2 from the apex of the leading edge curve in the bottom surface to the trailing edge is 20-25 mm, specifically 22 mm in this embodiment.

The implementation manners described above 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 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 determined by the protection scope of the claims.

Claims (1)

1. A supporting plate flame stabilizer with hoof-shaped grooves is characterized in that 3-5 hoof-shaped grooves (4) are uniformly arranged on two side surfaces of the supporting plate flame stabilizer; the support plate flame stabilizer has a chord length of 90-150 mm, an extension length is determined by a specific engine, the support plate flame stabilizer consists of a front edge (1), a straight section (2) and a V-shaped bottom surface (3), the front edge (1) 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 (1) is tangent and continuous with the straight section (2), the straight section (2) is 24-36mm wide, and an included angle of the V-shaped bottom surface (3) is 100-150 degrees; the tail edge of the hoof-shaped groove (4) is flush with the tail edge of the support plate flame stabilizer, the length of the tail edge of the hoof-shaped groove (4) is 40-50 mm, the height of the tail edge of the hoof-shaped groove (4) is 1-2 mm, the front of the bottom surface of the hoof-shaped groove (4) is low, the rear of the bottom surface of the hoof-shaped groove (4) is high, an included angle between the bottom surface of the hoof-shaped groove (4) and the surface of the straight section (2) is 10-20 degrees, two front edge curves of the hoof-shaped groove (4) are sample lines connecting a vertex and tail edge end points, the distance from the vertex of the front edge curve in the surface of the straight section (2) to the tail edge is 23-28 mm in the overlooking direction, and the distance from the vertex of the front edge curve in the bottom surface of the hoof-shaped groove (4) to the tail edge is 20-25 mm.

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