A radial stabilizer configuration for a thrust chamber

Abstract

The application belongs to the technical field of aero-engines, and particularly relates to a layout structure of a radial stabilizer of a thrust chamber, a casing, a converging ring, an inner cone body and a plurality of support plates distributed circumferentially between the converging ring and the inner cone body; wherein the tail edge of the support plate is a long radial stabilizer with a gradually increasing circumferential width along the airflow direction, the converging ring is provided with a short support plate at the position between adjacent long radial stabilizers, the fixed end of the short support plate is fixed on the inner surface of the converging ring, the free end extends radially inward by a certain length, the tail edge of the short support plate is a short radial stabilizer with a gradually increasing circumferential width along the airflow direction, the fixed end of the short radial stabilizer is fixed on the inner surface of the converging ring, and the free end extends radially inward by a certain length; the tail end of the long radial stabilizer and the tail end of the short radial stabilizer have the same axial position, the application increases the backflow area of the tail end of the stabilizer, and is beneficial to the radial propagation and combustion of the flame.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to a radial stabilizer layout structure for an afterburner. Background Technology

[0002] The adaptive variable cycle engine features a high thrust-to-weight ratio, low fuel consumption, strong stealth, and a wide range of adjustable bypass ratio, which places high demands on the afterburner for aerodynamic and thermodynamic performance and low detectability.

[0003] The stabilizer is a core component of the afterburner. It utilizes the low-speed recirculation zone generated by the blunt tail edge to stabilize the flame during fuel injection combustion. To achieve a compact structure and reduce flow losses, the ignition stabilizer is integrated with the outer wall surface, forming an external concave cavity vortex ignition stabilizer. The radial support plate tail edge flame propagation ensures the flame spreads throughout the entire main combustion channel. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a radial stabilizer layout structure for an afterburner, comprising:

[0005] The casing, confluence ring, inner cone, and multiple circumferentially distributed support plates installed between the confluence ring and the inner cone;

[0006] Among them, the trailing edge of the support plate has a long radial stabilizer whose circumferential width gradually increases along the airflow direction. The outer end of the long radial stabilizer is connected to the confluence ring, the inner end is connected to the inner cone, and the front end is connected to the trailing edge of the support plate.

[0007] A short support plate is provided between adjacent long radial stabilizers in the confluence ring. The fixed end of the short support plate is fixed to the inner surface of the confluence ring, and the free end extends radially inward for a certain length. The trailing edge of the short support plate has a short radial stabilizer whose circumferential width gradually increases along the airflow direction. The fixed end of the short radial stabilizer is fixed to the inner surface of the confluence ring, and the free end extends radially inward for a certain length.

[0008] The tail end of the long radial stabilizer is in the same axial position as the tail end of the short radial stabilizer.

[0009] Preferably, the circumferential width of the tail end of the radial stabilizer gradually decreases radially inward, and the circumferential width of the short radial stabilizer gradually decreases radially inward.

[0010] Preferably, the support plate has a circumferential bend for covering the gap between adjacent support plates.

[0011] Preferably, the short support plate has a gap between adjacent support plates on the radially outer side.

[0012] Preferably, the confluence ring at the axial position of the tail end of the radial stabilizer and the tail end of the short radial stabilizer has an outer concave cavity stabilizer formed by radial outward concavity.

[0013] Preferably, both the radial stabilizer and the short radial stabilizer are equipped with fuel injection rods.

[0014] Preferably, the fuel injection rod extends radially inward beyond the end face of the short radial stabilizer at the location of the short radial stabilizer.

[0015] Preferably, the injector rod extending beyond the short radial stabilizer has an injector rod heat shield.

[0016] Preferably, the heat shield of the spray bar is streamlined.

[0017] The advantages of this application include: It increases the recirculation zone at the stabilizer's tail end, which is beneficial for radial flame propagation and combustion. The circumferential width variation along both the axial and radial gradients balances the aerodynamic and combustion performance of the stabilizer, facilitating the circumferential cross-linking of the outer flame ring. This is conducive to achieving high outlet total temperature and high combustion efficiency in the afterburner. Simultaneously, the added short radial stabilizer shields the outer low-vortex rotor, reducing design constraints on the support plate shape and significantly improving the overall performance of the adaptive variable cycle engine's afterburner. Attached Figure Description

[0018] Figure 1 This is a side view of the layout structure of the radial stabilizer of the afterburner according to a preferred embodiment of this application;

[0019] Figure 2 This is a front view of the layout structure of the radial stabilizer of the afterburner according to a preferred embodiment of this application;

[0020] Figure 3 This is a cross-sectional view of the spray bar heat shield at a radial position according to a preferred embodiment of this application;

[0021] Figure 4 Cross-sectional views of the long radial stabilizer and the short radial stabilizer at a radial position in this application; Detailed Implementation

[0022] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0023] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0024] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0025] To address the problems of small trailing edge width of the support plates and difficulties in circumferential flame connection in the outer ring, a staggered layout structure of variable slot width and length radial stabilizers is proposed. This structure increases the trailing edge recirculation zone by increasing the trailing edge width. By altering the radial direction of the trailing edge width from the inside out and adding short stabilizers between the outer ring support plates, the flame connection capability in the circumferential region is enhanced, solving the problem of difficulty in improving the thermodynamic performance of the afterburner in adaptive variable cycle engines. The radial stabilizer layout structure of the afterburner in this application includes:

[0026] The casing 4, the confluence ring 5, the inner cone 6, and multiple support plates 1 circumferentially distributed between the confluence ring 5 and the inner cone 6;

[0027] Among them, the trailing edge of the support plate 1 has a long radial stabilizer 2 whose circumferential width gradually increases along the airflow direction. The outer end of the long radial stabilizer 2 is connected to the confluence ring 5, the inner end is connected to the inner cone 6, and the front end is connected to the trailing edge of the support plate 1.

[0028] A short support plate is provided between adjacent long radial stabilizers 2 in the confluence ring 5. The fixed end of the short support plate is fixed to the inner surface of the confluence ring 5, and the free end extends radially inward for a certain length. The tail edge of the short support plate has a short radial stabilizer 7a with a circumferential width that gradually increases along the airflow direction. The fixed end of the short radial stabilizer 7a is fixed to the inner surface of the confluence ring 5, and the free end extends radially inward for a certain length. The short radial stabilizer 7a solves the problem that the fuel concentration and recirculation zone of the adjacent long radial stabilizers 2 are smaller than those of the radially inward position due to the excessive gap at the radially outward position. The short radial stabilizer added between the support plates forms a wide low-speed zone, which makes the outer flame cross-linked circumferentially, and the entire stabilizer tail end forms a full and uniform combustion front, which is beneficial to the improvement of combustion efficiency and outlet temperature.

[0029] The tail end of the long radial stabilizer 2 is axially positioned the same as the tail end of the short radial stabilizer 7a, which facilitates the connection of the recirculation zone formed by the tail ends of the long radial stabilizer 2 and the short radial stabilizer 7a in the circumferential direction.

[0030] In some alternative embodiments, the circumferential width of the tail end of the long radial stabilizer 2 gradually decreases radially inward, and the circumferential width of the short radial stabilizer 7a gradually decreases radially inward. Because the radial direction is outward, the gap between the long radial stabilizers 2 gradually increases. By making the circumferential width gradually increase radially outward, the recirculation area formed downstream of the long radial stabilizer 2 can be gradually connected circumferentially.

[0031] In some alternative embodiments, the support plate 1 has a circumferential bend for covering the gap between adjacent support plates 1.

[0032] In some alternative embodiments, the short support plate has the function of shielding the gap between adjacent support plates 1 at the radially outer side. In addition, the addition of short support plates between the support plates forms a certain shielding of the outer ring turbine rotor, which improves the stealth performance and facilitates the shape design of the outer ring of the support plate. The inlet airflow angle of the outer ring of the support plate is close to the axial direction. In order to shield the turbine rotor, a large bending angle is adopted, which is easy to generate flow separation.

[0033] In some alternative embodiments, the confluence ring 5 at the axial position of the tail end of the radial stabilizer 2 and the tail end of the short radial stabilizer 7a has a radially outwardly recessed outer cavity stabilizer 3, which forms a stable recirculation zone and can circumferentially connect flames.

[0034] In some alternative embodiments, both the radial stabilizer 2 and the short radial stabilizer 7a are provided with fuel injection rods.

[0035] In some alternative embodiments, the fuel injector extends radially inward beyond the end face of the short radial stabilizer 7a at the location of the short radial stabilizer 7a.

[0036] In some alternative embodiments, the fuel injector bar beyond the short radial stabilizer 7a has a fuel injector bar heat shield 7b.

[0037] In some alternative embodiments, the spray bar heat shield 7b is streamlined. The heat shield 7b near the inner side of the spray bar is used to protect the spray bar from being burned by the high-temperature combustion gases inside. Its streamlined shape reduces flow loss, and the tail end full angle of less than 20° reduces radar scattering.

[0038] The advantages of this application include: It increases the recirculation zone at the stabilizer's tail end, which is beneficial for radial flame propagation and combustion. The circumferential width variation along both the axial and radial gradients balances the aerodynamic and combustion performance of the stabilizer, facilitating the circumferential cross-linking of the outer flame ring. This is conducive to achieving high outlet total temperature and high combustion efficiency in the afterburner. Simultaneously, the added short radial stabilizer shields the outer low-vortex rotor, reducing design constraints on the support plate shape and significantly improving the overall performance of the adaptive variable cycle engine's afterburner.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A radial stabilizer layout structure for an afterburner, characterized in that, include: The casing (4), the confluence ring (5), the inner cone (6), and multiple support plates (1) circumferentially distributed between the confluence ring (5) and the inner cone (6); Among them, the trailing edge of the support plate (1) has a long radial stabilizer (2) whose circumferential width gradually increases along the airflow direction. The outer end of the long radial stabilizer (2) is connected to the confluence ring (5), the inner end is connected to the inner cone (6), and the front end is connected to the trailing edge of the support plate (1). A short support plate is provided between adjacent long radial stabilizers (2) of the confluence ring (5). The fixed end of the short support plate is fixed on the inner surface of the confluence ring (5), and the free end extends radially inward for a certain length. The tail edge of the short support plate has a short radial stabilizer (7a) whose circumferential width gradually increases along the airflow direction. The fixed end of the short radial stabilizer (7a) is fixed on the inner surface of the confluence ring (5), and the free end extends radially inward for a certain length. The tail end of the long radial stabilizer (2) is in the same axial position as the tail end of the short radial stabilizer (7a); The circumferential width of the tail end of the radial stabilizer (2) gradually decreases radially inward, and the circumferential width of the short radial stabilizer (7a) gradually decreases radially inward.

2. The radial stabilizer layout structure of the afterburner as described in claim 1, characterized in that, The support plate (1) has a circumferential bend for covering the gap between adjacent support plates (1).

3. The radial stabilizer layout structure of the afterburner as described in claim 2, characterized in that, The short support plate has a gap that shields the adjacent support plate (1) at the radially outer side.

4. The radial stabilizer layout structure of the afterburner as described in claim 1, characterized in that, The confluence ring (5) at the axial position of the tail end of the radial stabilizer (2) and the tail end of the short radial stabilizer (7a) has an outer concave cavity stabilizer (3) formed by radial outward concavity.

5. The radial stabilizer layout structure of the afterburner as described in claim 1, characterized in that, Both the radial stabilizer (2) and the short radial stabilizer (7a) are equipped with fuel injection rods.

6. The radial stabilizer layout structure of the afterburner as described in claim 1, characterized in that, The fuel injector extends radially inward beyond the end face of the short radial stabilizer (7a) at the location of the short radial stabilizer (7a).

7. The radial stabilizer layout structure of the afterburner as described in claim 5, characterized in that, The injector bar extending beyond the short radial stabilizer (7a) has an injector bar heat shield (7b).

8. The radial stabilizer layout structure of the afterburner as described in claim 5, characterized in that, The spray bar heat shield (7b) is streamlined.

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