Equivalent analysis method and system for aerodynamic load of adjustable nozzle adjusting sheet

Abstract

The invention relates to the technical field of adjustable nozzle design, and discloses an adjustable nozzle adjusting sheet aerodynamic load equivalent analysis method and system.The adjustable nozzle adjusting sheet aerodynamic load equivalent analysis method comprises the steps that an adjustable nozzle three-dimensional structure model is constructed, the inlet section and the throat section of an adjustable nozzle are divided, and an engine outlet and the throat section of the adjustable nozzle are analyzed; performing equivalence on the initial aerodynamic load of the adjusting sheet by adopting the proportional amplification coefficient to obtain an equivalent value of the aerodynamic load of the wall surface on the adjusting sheet; the aerodynamic load equivalent value comprises the load transmitted by the sealing piece, the load of the sealing piece does not need to be considered when aerodynamic analysis of the adjustable spray pipe is carried out, the linear-surface contact nonlinear problem between fish scales (the sealing piece and the adjusting piece) during kinetic analysis is solved, and the convergence of a calculation model is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of adjustable nozzle design, and discloses an aerodynamic load equivalent analysis method and system for an adjustable nozzle regulating plate. Background Art

[0002] The main function of the tail nozzle of a jet engine is to expand the gas and accelerate the ejection, thereby generating a forward force. The adjustable nozzle is a common device for turbine engines with afterburners. The nozzle is a circular outlet cross-section composed of an adjustment plate and a sealing plate overlapped with each other. Under different flight conditions, by adjusting the nozzle throat area and outlet area, the engine can obtain higher characteristics and performance within a wide operating range.

[0003] As a key component of modern advanced aircraft engines, the working reliability of the adjustable nozzle directly affects the maneuverability and safety of the aircraft. Carrying out load analysis on the adjustable nozzle motion mechanism is a prerequisite for ensuring the reliable operation of the adjustable nozzle. At present, there are two difficulties in carrying out load analysis and dynamic simulation of the adjustable nozzle: First, since the adjustable nozzle is a relatively complex mechanical component, its model needs to be simplified to achieve "refined and refined" so that the simplified calculation model can obtain the load calculation results of the main components; second, the aerodynamic load on the inner wall of the adjustable nozzle adjustment plate changes under different working conditions. How to accurately simulate the aerodynamic load is the key to ensuring the accuracy of the motion mechanism load calculation. Summary of the invention

[0004] The purpose of the present invention is to provide an aerodynamic load equivalent analysis method and system for an adjustable nozzle adjusting plate, which can solve the line-surface contact nonlinear problem between fish scales (sealing plates and adjusting plates) during the dynamic analysis of the adjustable nozzle, and greatly improve the convergence of the calculation model.

[0005] In order to achieve the above technical effects, the technical solution adopted by the present invention is: An equivalent analysis method for aerodynamic loads of an adjustable nozzle adjusting plate includes: Constructing a three-dimensional structural model of an adjustable nozzle, the three-dimensional structural model of the adjustable nozzle comprising an adjusting plate arranged at an engine outlet, the adjusting plates being in a plurality and evenly distributed along the circumferential direction of the engine outlet; each adjusting plate being movably installed by an actuator, and a sealing plate being further arranged between two adjacent adjusting plates, so as to form an adjustable nozzle of the engine; Establishing a first circumscribed regular polygon of the circular cross section of the inlet of the adjustable nozzle, wherein the number of sides of the first circumscribed regular polygon is equal to the number of the adjusting plates; establishing a second circumscribed regular polygon of the circular cross section of the throat of the adjustable nozzle, wherein the number of sides of the second circumscribed regular polygon is equal to the number of the adjusting plates, and the sides of the second circumscribed regular polygon are parallel to the corresponding sides of the first circumscribed regular polygon; Connect the corresponding corner points of the first circumscribed regular polygon and the second circumscribed regular polygon to form a prism structure; according to the number of initial aerodynamic loads of the adjustment plate under the calculation conditions , the prism structure is divided into Regular polygonal analytical sections; The side length of each regular polygon analysis section is calculated according to the side length of the first circumscribed regular polygon of the inlet section and the side length of the second circumscribed regular polygon of the throat section; the width of the adjusting piece at each regular polygon analysis section is obtained by analysis according to the initial width of the adjusting piece at the inlet section and the initial width of the adjusting piece at the throat section; Analyze the side length of each regular polygon section The width of the adjustment piece at the corresponding position Compared with the above, the proportional magnification factor of the adjustment piece is obtained. , the initial aerodynamic load of the regulating plate is analyzed equivalently by using the proportional magnification factor to obtain the equivalent value of the wall aerodynamic load on the regulating plate , is the initial aerodynamic load under the corresponding working condition calculated based on the flow field.

[0006] Furthermore, the side length of the first circumscribed regular polygon is ,in is the radius of the circular cross section of the adjustable nozzle inlet, is the central angle of the first circumscribed regular polygon.

[0007] Furthermore, the side length of the second circumscribed regular polygon is ,in is the radius of the circular cross section of the adjustable nozzle throat.

[0008] Further, The side length of the regular polygonal analytical section ,in , is the side length of the first circumscribed regular polygon, is the side length of the second circumscribed regular polygon; The width of the adjustment piece at the regular polygon analysis section , is the initial width of the regulating piece at the inlet section, is the initial width of the adjusting plate at the throat section.

[0009] In order to achieve the above technical effects, the present invention further provides an adjustable nozzle adjustment plate aerodynamic load equivalent analysis system, which is used to implement the adjustable nozzle adjustment plate aerodynamic load equivalent analysis method, comprising: A model building module is used to build a three-dimensional structural model of an adjustable nozzle, wherein the three-dimensional structural model of the adjustable nozzle includes an adjusting plate arranged at an engine outlet, wherein the adjusting plates are in a plurality and are evenly distributed along the circumferential direction of the engine outlet; each adjusting plate is movably installed by an actuator, and a sealing plate is further arranged between two adjacent adjusting plates, so as to form an adjustable nozzle of the engine; An inlet and outlet cross-section processing module is used to establish a first circumscribed regular polygon of the inlet circular cross-section of the adjustable nozzle, the number of sides of the first circumscribed regular polygon being equal to the number of adjusting plates; and to establish a second circumscribed regular polygon of the throat circular cross-section of the adjustable nozzle, the number of sides of the second circumscribed regular polygon being equal to the number of adjusting plates, and the sides of the second circumscribed regular polygon being parallel to the corresponding sides of the first circumscribed regular polygon; The cross-section division module is used to connect the corner points corresponding to the first circumscribed regular polygon and the second circumscribed regular polygon to form a prism structure; according to the number of initial aerodynamic loads of the adjustment plate under the calculation condition , the prism structure is divided into Regular polygonal analytical sections; A parameter calculation module is used to calculate the side length of each regular polygon analysis section according to the side length of the first circumscribed regular polygon of the inlet section and the side length of the second circumscribed regular polygon of the throat section; and to analyze and obtain the width of the adjustment piece at each regular polygon analysis section according to the initial width of the adjustment piece at the inlet section and the initial width of the adjustment piece at the throat section; Aerodynamic load equivalence module, used to convert the side length of each regular polygonal analysis section The width of the adjustment piece at the corresponding position Compared with the above, the proportional magnification factor of the adjustment piece is obtained. , the initial aerodynamic load of the regulating plate is analyzed equivalently by using the proportional magnification factor to obtain the equivalent value of the wall aerodynamic load on the regulating plate , is the initial aerodynamic load under the corresponding working condition calculated based on the flow field.

[0010] Furthermore, in the parameter calculation module, the side length of the first circumscribed regular polygon ,in is the radius of the circular cross section of the adjustable nozzle inlet, is the central angle of the first circumscribed regular polygon.

[0011] Furthermore, in the parameter calculation module, the side length of the second circumscribed regular polygon ,in is the radius of the circular cross section of the adjustable nozzle throat. Further, in the parameter calculation module, The side length of the regular polygonal analytical section ,in , is the side length of the first circumscribed regular polygon, is the side length of the second circumscribed regular polygon; The width of the adjustment piece at the regular polygon analysis section , is the initial width of the regulating piece at the inlet section, is the initial width of the adjusting plate at the throat section.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention constructs a three-dimensional structural model of an adjustable nozzle, divides the inlet section and throat section of the adjustable nozzle, and analyzes the engine outlet and the throat section of the adjustable nozzle to obtain the proportional magnification coefficient of the regulating plate, and then uses the proportional magnification coefficient to perform equivalent to the initial aerodynamic load of the regulating plate to obtain the equivalent value of the wall aerodynamic load on the regulating plate; the aerodynamic load equivalent value includes the load transmitted by the sealing plate, and there is no need to consider the load of the sealing plate when performing aerodynamic analysis of the adjustable nozzle, which solves the line-surface contact nonlinearity problem between the fish scales (sealing plate and regulating plate) during dynamic analysis, and greatly improves the convergence of the calculation model. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a flow chart of the aerodynamic load equivalent analysis method of the adjustable nozzle adjustment plate in Example 1 or 2; Figure 2 It is a schematic diagram of the force analysis of the adjustable nozzle adjusting plate and the sealing plate in Example 1 or 2; Figure 3 A schematic diagram of a regular polygonal structure of an adjustable nozzle inlet cross section and a throat cross section constructed in Example 1 or 2; Figure 4 It is a schematic diagram of the installation of the adjusting plate, the actuator and the sealing plate in Embodiment 1 or 2; Figure 5 This is a structural block diagram of the aerodynamic load equivalent analysis system for the adjustable nozzle adjustment plate in Example 1; Among them, 1. Adjustment plate; 2. Sealing plate; 3. Limit hook; 4. Support mechanism; 5. Roller; 6. Actuator; 7. Model building module; 8. Inlet and outlet section processing module; 9. Section division module; 10. Parameter calculation module; 11. Pneumatic load equivalent module. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the embodiments and drawings. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0015] Example 1 See also Figure 1-Figure 5 , an equivalent analysis method for aerodynamic loads of adjustable nozzle adjustment plates, comprising: A three-dimensional structural model of an adjustable nozzle is constructed, wherein the three-dimensional structural model of the adjustable nozzle includes an adjusting piece 1 arranged at the engine outlet, wherein the adjusting pieces 1 are in multiple numbers and the multiple adjusting pieces 1 are evenly distributed along the circumferential direction of the engine outlet; each adjusting piece 1 is movably installed by an actuator 6, and a sealing piece 2 is further arranged between two adjacent adjusting pieces 1, so as to form an adjustable nozzle of the engine; Establish a first circumscribed regular polygon of the circular cross section of the adjustable nozzle inlet, the number of sides of the first circumscribed regular polygon being equal to the number of the adjusting pieces 1; establish a second circumscribed regular polygon of the circular cross section of the adjustable nozzle throat, the number of sides of the second circumscribed regular polygon being equal to the number of the adjusting pieces 1, and the sides of the second circumscribed regular polygon being parallel to the corresponding sides of the first circumscribed regular polygon; Connect the corresponding corner points of the first circumscribed regular polygon and the second circumscribed regular polygon to form a prism structure; according to the number of initial aerodynamic loads of the adjustment plate 1 under the calculation condition , the prism structure is divided into Regular polygonal analytical sections; The side length of each regular polygon analysis section is calculated according to the side length of the first circumscribed regular polygon of the inlet section and the side length of the second circumscribed regular polygon of the throat section; the width of the adjusting piece 1 at each regular polygon analysis section is obtained by analysis according to the initial width of the adjusting piece 1 at the inlet section and the initial width of the adjusting piece 1 at the throat section; Analyze the side length of each regular polygon section The width of the adjusting piece 1 at the corresponding position Compared with the above, the proportional magnification factor of adjustment sheet 1 is obtained. , the initial aerodynamic load of the regulating piece 1 is analyzed equivalently by using the proportional magnification factor to obtain the equivalent value of the wall aerodynamic load on the regulating piece 1 , is the initial aerodynamic load under the corresponding working condition calculated based on the flow field.

[0016] In this embodiment, the adjustable nozzle is a fish scale structure composed of a sealing plate 2 and an adjusting plate 1. The extension or contraction of the hydraulic actuator 6 drives the roller 5 to move on the profile of the support mechanism 4, thereby driving the adjusting plate 1 to rotate around the hinge point c (the hinge points a and b will also rotate adaptively). The adjusting plate 1 drives the sealing plate 2 to rotate around the hinge point through the limit hook 3 to achieve the adjustment of the nozzle throat area; wherein the aerodynamic load borne by the nozzle is transmitted to the nozzle actuation mechanism through the fish scale structure. By analyzing the engine outlet and the throat section of the adjustable nozzle, the proportional magnification coefficient of the adjusting plate 1 is obtained, and then the initial aerodynamic load of the adjusting plate 1 is equivalently used to obtain the equivalent value of the wall aerodynamic load on the adjusting plate 1; the equivalent value of the aerodynamic load includes the load transmitted by the sealing plate 2, and there is no need to consider the load of the sealing plate 2 when performing the aerodynamic analysis of the adjustable nozzle, which solves the line-surface contact nonlinearity problem between the fish scale sealing plate 2 and the adjusting plate 1 during the dynamic analysis, and greatly improves the convergence of the calculation model.

[0017] Based on the same inventive concept, this embodiment also provides an adjustable nozzle adjustment plate aerodynamic load equivalent analysis system, including: A model building module 7 is used to build a three-dimensional structural model of an adjustable nozzle, wherein the three-dimensional structural model of the adjustable nozzle includes an adjusting piece 1 arranged at the engine outlet, wherein the adjusting pieces 1 are in multiple numbers and the multiple adjusting pieces 1 are evenly distributed along the circumferential direction of the engine outlet; each adjusting piece 1 is movably installed by an actuator 6, and a sealing piece 2 is further arranged between two adjacent adjusting pieces 1, so as to form an adjustable nozzle of the engine; The inlet and outlet cross-section processing module 8 is used to establish a first circumscribed regular polygon of the inlet circular cross-section of the adjustable nozzle, the number of sides of the first circumscribed regular polygon is equal to the number of the adjusting pieces 1; establish a second circumscribed regular polygon of the throat circular cross-section of the adjustable nozzle, the number of sides of the second circumscribed regular polygon is equal to the number of the adjusting pieces 1, and the sides of the second circumscribed regular polygon are parallel to the corresponding sides of the first circumscribed regular polygon; The cross-section division module 9 is used to connect the corner points corresponding to the first circumscribed regular polygon and the second circumscribed regular polygon to form a prism structure; according to the number of initial aerodynamic loads of the adjustment piece 1 under the calculation condition , the prism structure is divided into Regular polygonal analytical sections; The parameter calculation module 10 is used to calculate the side length of each regular polygon analysis section according to the side length of the first circumscribed regular polygon of the inlet section and the side length of the second circumscribed regular polygon of the throat section; and to analyze and obtain the width of the adjustment piece 1 at each regular polygon analysis section according to the initial width of the adjustment piece 1 at the inlet section and the initial width of the adjustment piece 1 at the throat section; Aerodynamic load equivalent module 11 is used to convert the side length of each regular polygon analysis section The width of the adjusting piece 1 at the corresponding position Compared with the above, the proportional magnification factor of adjustment sheet 1 is obtained. , the initial aerodynamic load of the regulating piece 1 is analyzed equivalently by using the proportional magnification factor to obtain the equivalent value of the wall aerodynamic load on the regulating piece 1 , is the initial aerodynamic load under the corresponding working condition calculated based on the flow field.

[0018] Example 2 See also Figure 1-Figure 4 , an equivalent analysis method for aerodynamic loads of adjustable nozzle adjustment plates, comprising: Step 1: construct a three-dimensional structural model of an adjustable nozzle, wherein the three-dimensional structural model of the adjustable nozzle includes an adjusting piece 1 arranged at the engine outlet, wherein the adjusting pieces 1 are in multiple numbers and the adjusting pieces 1 are evenly distributed along the circumferential direction of the engine outlet; each adjusting piece 1 is movably installed by an actuator 6, and a sealing piece 2 is further arranged between two adjacent adjusting pieces 1, so as to form an adjustable nozzle of the engine; Step 2: Establish a first circumscribed regular polygon of the circular cross section of the adjustable nozzle inlet, the number of sides of the first circumscribed regular polygon being equal to the number of the adjusting pieces 1; establish a second circumscribed regular polygon of the circular cross section of the adjustable nozzle throat, the number of sides of the second circumscribed regular polygon being equal to the number of the adjusting pieces 1, and the sides of the second circumscribed regular polygon being parallel to the corresponding sides of the first circumscribed regular polygon; In this embodiment, the side length of the first circumscribed regular polygon is ,in is the radius of the circular cross section of the adjustable nozzle inlet, is the central angle of the first circumscribed regular polygon. The side length of the second circumscribed regular polygon ,in is the radius of the circular cross section of the adjustable nozzle throat.

[0019] Step 3: Connect the corresponding corner points of the first circumscribed regular polygon and the second circumscribed regular polygon to form a prism structure; adjust the number of initial aerodynamic loads of the plate 1 under the calculation conditions. , the prism structure is divided into Regular polygonal analytical sections; Step 4: Calculate the side length of each regular polygon analysis section according to the side length of the first circumscribed regular polygon of the inlet section and the side length of the second circumscribed regular polygon of the throat section; Analyze and obtain the width of the adjusting piece 1 at each regular polygon analysis section according to the initial width of the adjusting piece 1 at the inlet section and the initial width of the adjusting piece 1 at the throat section; Step 5: Analyze the side length of each regular polygon section The width of the adjusting piece 1 at the corresponding position Compared with the above, the proportional magnification factor of adjustment sheet 1 is obtained. , the initial aerodynamic load of the regulating piece 1 is analyzed equivalently by using the proportional magnification factor to obtain the equivalent value of the wall aerodynamic load on the regulating piece 1 , is the initial aerodynamic load under the corresponding working condition calculated based on the flow field.

[0020] In this embodiment, The side length of the regular polygonal analytical section ,in , is the side length of the first circumscribed regular polygon, is the side length of the second circumscribed regular polygon; The width of the adjustment piece 1 at the regular polygon analysis section , is the initial width of the regulating piece 1 at the inlet section, is the initial width of the adjusting plate 1 at the throat section.

[0021] Equivalent aerodynamic load It can be used for parameterized analysis of the dynamics, strength calculation and life assessment of adjustable nozzle motion mechanisms.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An equivalent analysis method for aerodynamic loads of adjustable nozzle adjustment plates, characterized in that: include: Constructing a three-dimensional structural model of an adjustable nozzle, the three-dimensional structural model of the adjustable nozzle comprising an adjusting plate arranged at an engine outlet, the adjusting plates being in a plurality and evenly distributed along the circumferential direction of the engine outlet; each adjusting plate being movably installed by an actuator, and a sealing plate being further arranged between two adjacent adjusting plates, so as to form an adjustable nozzle of the engine; Establishing a first circumscribed regular polygon of the circular cross section of the inlet of the adjustable nozzle, wherein the number of sides of the first circumscribed regular polygon is equal to the number of the adjusting plates; establishing a second circumscribed regular polygon of the circular cross section of the throat of the adjustable nozzle, wherein the number of sides of the second circumscribed regular polygon is equal to the number of the adjusting plates, and the sides of the second circumscribed regular polygon are parallel to the corresponding sides of the first circumscribed regular polygon; Connect the corresponding corner points of the first circumscribed regular polygon and the second circumscribed regular polygon to form a prism structure; according to the number of initial aerodynamic loads of the adjustment plate under the calculation conditions , the prism structure is divided into Regular polygonal analytical sections; The side length of each regular polygon analysis section is calculated according to the side length of the first circumscribed regular polygon of the inlet section and the side length of the second circumscribed regular polygon of the throat section; the width of the adjusting piece at each regular polygon analysis section is obtained by analysis according to the initial width of the adjusting piece at the inlet section and the initial width of the adjusting piece at the throat section; Analyze the side length of each regular polygon section The width of the adjustment piece at the corresponding position Compared with the above, the proportional magnification factor of the adjustment piece is obtained. , the initial aerodynamic load of the regulating plate is analyzed equivalently by using the proportional magnification factor to obtain the equivalent value of the wall aerodynamic load on the regulating plate , is the initial aerodynamic load under the corresponding working condition calculated based on the flow field.

2. The method for equivalent analysis of aerodynamic loads of adjustable nozzle adjustment plates according to claim 1, characterized in that: The side length of the first circumscribed regular polygon ,in is the radius of the circular cross section of the adjustable nozzle inlet, is the central angle of the first circumscribed regular polygon.

3. The method for equivalent analysis of aerodynamic loads of adjustable nozzle adjustment plates according to claim 2, characterized in that: The side length of the second circumscribed regular polygon ,in is the radius of the circular cross section of the adjustable nozzle throat.

4. The method for equivalent analysis of aerodynamic loads of adjustable nozzle adjustment plates according to claim 3, characterized in that: No. The side length of the regular polygonal analytical section ,in , is the side length of the first circumscribed regular polygon, is the side length of the second circumscribed regular polygon; The width of the adjustment piece at the regular polygon analysis section , is the initial width of the regulating piece at the inlet section, is the initial width of the adjusting plate at the throat section.

5. An adjustable nozzle adjustment plate aerodynamic load equivalent analysis system, used to implement the adjustable nozzle adjustment plate aerodynamic load equivalent analysis method according to claim 1; characterized in that: include: A model building module is used to build a three-dimensional structural model of an adjustable nozzle, wherein the three-dimensional structural model of the adjustable nozzle includes an adjusting plate arranged at an engine outlet, wherein the adjusting plates are in a plurality and are evenly distributed along the circumferential direction of the engine outlet; each adjusting plate is movably installed by an actuator, and a sealing plate is further arranged between two adjacent adjusting plates, so as to form an adjustable nozzle of the engine; An inlet and outlet cross-section processing module is used to establish a first circumscribed regular polygon of the inlet circular cross-section of the adjustable nozzle, the number of sides of the first circumscribed regular polygon being equal to the number of adjusting plates; and to establish a second circumscribed regular polygon of the throat circular cross-section of the adjustable nozzle, the number of sides of the second circumscribed regular polygon being equal to the number of adjusting plates, and the sides of the second circumscribed regular polygon being parallel to the corresponding sides of the first circumscribed regular polygon; The cross-section division module is used to connect the corner points corresponding to the first circumscribed regular polygon and the second circumscribed regular polygon to form a prism structure; according to the number of initial aerodynamic loads of the adjustment plate under the calculation condition , the prism structure is divided into Regular polygonal analytical sections; A parameter calculation module is used to calculate the side length of each regular polygon analysis section according to the side length of the first circumscribed regular polygon of the inlet section and the side length of the second circumscribed regular polygon of the throat section; and to analyze and obtain the width of the adjustment piece at each regular polygon analysis section according to the initial width of the adjustment piece at the inlet section and the initial width of the adjustment piece at the throat section; Aerodynamic load equivalence module, used to convert the side length of each regular polygonal analysis section The width of the adjustment piece at the corresponding position Compared with the above, the proportional magnification factor of the adjustment piece is obtained. , the initial aerodynamic load of the regulating plate is analyzed equivalently by using the proportional magnification factor to obtain the equivalent value of the wall aerodynamic load on the regulating plate , is the initial aerodynamic load under the corresponding working condition calculated based on the flow field.

6. The aerodynamic load equivalent analysis system for adjustable nozzle adjustment plate according to claim 5, characterized in that: In the parameter calculation module, the side length of the first circumscribed regular polygon ,in is the radius of the circular cross section of the adjustable nozzle inlet, is the central angle of the first circumscribed regular polygon.

7. The aerodynamic load equivalent analysis system for adjustable nozzle adjustment plate according to claim 6, characterized in that: In the parameter calculation module, the side length of the second circumscribed regular polygon ,in is the radius of the circular cross section of the adjustable nozzle throat.

8. The aerodynamic load equivalent analysis system for adjustable nozzle adjustment plate according to claim 7, characterized in that: In the parameter calculation module, The side length of the regular polygonal analytical section ,in , is the side length of the first circumscribed regular polygon, is the side length of the second circumscribed regular polygon; The width of the adjustment piece at the regular polygon analysis section , is the initial width of the regulating piece at the inlet section, is the initial width of the adjusting plate at the throat section.

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