Aero-engine and divergence-angle-adjustable swirler thereof

Abstract

The invention discloses an aero-engine and a swirler with an adjustable divergence angle thereof, and the swirler with the adjustable divergence angle comprises a swirler main body, a sleeve assembly and an adjusting assembly; the sleeve assembly comprises a plurality of fan-shaped wall faces, every two adjacent fan-shaped wall faces are partially overlapped, the multiple fan-shaped wall faces are sequentially enclosed in the circumferential direction to form a conical barrel-shaped structure, and the first end of the conical barrel-shaped structure is hinged to the outlet end of the swirler body. The adjusting assembly is installed on the swirler body, connected with the fan-shaped wall face and used for driving the fan-shaped wall face to rotate relative to the swirler body, and then the divergence angle of the second end of the conical barrel-shaped structure is driven to be expanded or reduced. According to the swirler with the adjustable divergence angle, fine adjustment of a flow field in the working state can be achieved, the comprehensive performance of a combustion chamber is improved, a proper oil-gas mixture is provided for combustion in a flame tube, and a large number of resources can be saved in the design stage.

Description

Technical Field

[0001] The invention relates to the technical field of vortex finders of aircraft engines, in particular to a vortex finder with an adjustable expansion angle and an aircraft engine using the vortex finder with an adjustable expansion angle. Background Art

[0002] Swirl finders are an important component of combustion and airflow distribution in the combustion chambers of modern aircraft engines and gas turbines. Conventional combustion chamber swirlers are generally arranged at the head of the combustion chamber. Their main functions include forming a recirculation zone, anchoring the flame, stabilizing combustion, helping fuel atomization, and promoting oil-gas mixing. The airflow entering the combustion chamber is converted into a high-speed rotating airflow through the swirler and then enters the flame tube. The strong shear force of the rotating airflow at each level of the swirler performs secondary atomization on the fuel sprayed from the fuel nozzle, which can promote the fuel to break into smaller droplets and enhance the fuel atomization performance. At the same time, a large annular vortex structure is formed after the swirler outlet, that is, the central recirculation zone. This structure can anchor the flame for the combustion chamber, stabilize combustion, and promote oil-gas mixing, and plays an important role in the ignition and performance of the combustion chamber. Therefore, the swirler plays a vital role in the overall performance of the entire combustion chamber.

[0003] At present, in order to form a strong swirling airflow to enhance the quality of fuel atomization and promote the full mixing of oil and gas, the outlet of the vortex finder generally adopts an expansion sleeve structure to control the oil mist field and flow field structure downstream of the fuel nozzle. The expansion sleeve can effectively control the expansion degree of the airflow at the outlet of the vortex finder, thereby affecting the size structure of the recirculation zone in the center of the combustion chamber. Therefore, the expansion angle of the sleeve outlet is a key factor in the sleeve design. In the design of the combustion chamber, the increase of the expansion angle can effectively increase the volume of the recirculation zone and enhance the ignition performance of the combustion chamber. However, when the volume of the recirculation zone is too large, the high-temperature gas inside it is close to the wall, which will bring a greater load to the life of the flame tube. In addition, the sleeve expansion angle also has a certain influence on the stability of fuel atomization. It is generally recommended to take the value range between 60° and 140°. When the sleeve expansion angle is less than or equal to 90°, the spray stability is good. When it is greater than 140°, the spray angle is large and tends to adhere to the guide plate, and the spray quality deteriorates.

[0004] Therefore, in order to pursue better ignition performance, it is generally hoped that the sleeve expansion angle is larger, while for the sake of flame tube strength and life, it is hoped that the sleeve expansion angle is smaller, so that the high-temperature airflow is away from the flame tube wall. In addition, the impact on fuel atomization must be considered, resulting in the current sleeve design needing to repeatedly measure the impact of multiple parameters, and after multiple rounds of iterative design, the most suitable sleeve expansion angle is selected by compromise. However, the combustion chamber is not in a single state during actual working, and the optimal solution for the combustion chamber flow field structure under different states is not single. The existing vortexer structure design can only compromise and select a structural parameter that can meet the requirements in all states, and cannot achieve fine control of the combustion chamber flow field under different states, and cannot achieve the optimal solution for comprehensive performance. In addition, the performance results under each state and each parameter need to be repeatedly calculated during the design process, which consumes a lot of design costs and computing resources. Summary of the invention

[0005] The present invention primarily provides a vortex finder with an adjustable expansion angle, so as to solve the technical problems that the expansion angle of the sleeve of the existing vortex finder is difficult to design and cannot meet the requirements of different working conditions.

[0006] The present invention also provides an aero-engine, which adopts the vortex finder with adjustable expansion angle.

[0007] According to one aspect of the present invention, there is provided a vortex finder with adjustable expansion angle, comprising a vortex finder body, a sleeve assembly and an adjustment assembly;

[0008] The sleeve assembly comprises a plurality of sector-shaped wall surfaces, two adjacent sector-shaped wall surfaces are partially overlapped, and the plurality of sector-shaped wall surfaces are sequentially enclosed along the circumferential direction to form a conical cylindrical structure, and a first end of the conical cylindrical structure is hinged to the outlet end of the vortex finder body;

[0009] The regulating assembly is mounted on the vortex finder body, connected to the sector wall and used to drive the sector wall to rotate relative to the vortex finder body, thereby driving the expansion angle of the second end of the conical cylindrical structure to expand or contract.

[0010] Preferably, a chute is provided in the vortex finder body, an inner pressure hole communicating with the outlet end of the vortex finder body is provided at a first end of the chute, and an outer pressure hole communicating with the atmosphere is provided at a second end of the chute;

[0011] The adjusting assembly comprises a slider, a compression spring and a driving rod, wherein the slider is arranged in the slide slot and is used to slide along the slide slot, the compression spring is pressed between the slider and the first end of the slide slot, the first end of the driving rod is hinged to the slider, and the second end of the driving rod is hinged to the fan-shaped wall surface;

[0012] The compression spring is used to drive the slider to move toward the second end of the slide groove, thereby driving the fan-shaped wall surface to rotate radially outward along the vortex finder body through the driving rod to drive the expansion angle of the second end of the conical cylindrical structure to expand; the internal pressure hole is used to drive the slider to move toward the first end of the slide groove by the negative pressure generated by the vortex finder body during operation, thereby driving the fan-shaped wall surface to rotate radially inward along the vortex finder body through the driving rod to drive the expansion angle of the second end of the conical cylindrical structure to gradually decrease.

[0013] Preferably, the slide groove is arranged along the radial direction of the vortex finder body, and the internal pressure hole is opened along the axial direction of the vortex finder body on the side wall of the slide groove facing the outlet end of the vortex finder body.

[0014] Preferably, a connecting seat is provided on an outer side wall of one end of the sector-shaped wall surface away from the vortex finder body, and the second end of the driving rod is hinged to the connecting seat.

[0015] Preferably, a plurality of the adjusting components are provided, and the adjusting components are arranged in one-to-one correspondence with the sector-shaped wall surfaces.

[0016] Preferably, a limiting groove is provided at the outlet end of the vortex finder body, an arc-shaped rotating portion is provided on the fan-shaped wall surface and is embedded in the limiting groove and used to rotate along the limiting groove, and a limiting wall is provided in the limiting groove for limiting the maximum rotation stroke of the arc-shaped rotating portion.

[0017] Preferably, the vortex finder body comprises a primary vortex finder and a secondary vortex finder which are sequentially arranged along the axial direction, and a venturi which is arranged at the outlet end of the primary vortex finder and extends into the secondary vortex finder.

[0018] Preferably, the vortex finder body also includes a vortex finder cover plate connected to the secondary vortex finder, the vortex finder cover plate and the secondary vortex finder are combined to form an annular mounting groove arranged around the primary vortex finder, the primary vortex finder includes an annular mounting edge arranged in the annular mounting groove, the diameter of the annular mounting groove is larger than the diameter of the annular mounting edge, and the axial width of the annular mounting groove is equal to the axial width of the annular mounting edge.

[0019] Preferably, the first-stage vortex finder is configured as a bevel-hole vortex finder, and the second-stage vortex finder is configured as a radial vortex finder.

[0020] As a second aspect, the present invention further provides an aircraft engine, comprising the above-mentioned vortex finder with adjustable expansion angle.

[0021] The present invention has the following beneficial effects:

[0022] In the vortex finder with adjustable expansion angle provided by the present invention, the sleeve assembly is formed by enclosing a conical cylindrical structure through multiple fan-shaped wall surfaces, and two adjacent fan-shaped wall surfaces are partially overlapped to form a variable geometry sleeve, so that the expansion angle of the conical cylindrical structure can be flexibly expanded or reduced, and the closed cylindrical structure is kept enclosed during the adjustment process, ensuring that the flow field performance is stable and reliable. Therefore, by driving the fan-shaped wall surface to rotate relative to the vortex finder body through the adjustment assembly, the expansion angle of the second end of the conical cylindrical structure can be driven to expand or reduce, thereby realizing fine adjustment of the flow field in the working state, improving the comprehensive performance of the combustion chamber, providing a suitable oil-gas mixture for combustion in the flame tube, satisfying the autonomous adjustment of expanding the recirculation zone in a small state to enhance the ignition and cross-flame performance, and compressing the recirculation zone in a large state to reduce the wall temperature, and can save a large amount of design resources and computing resources for multi-state optimization in the design stage.

[0023] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 A schematic cross-sectional structure diagram of a vortex finder with adjustable expansion angle provided in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A perspective view of a sleeve assembly in a vortex finder with adjustable expansion angle is shown;

[0027] Figure 3 for Figure 1 The assembly structure diagram of the adjustment component in the vortex finder with adjustable expansion angle shown;

[0028] Figure 4 for Figure 1 The diagram of the changing state of the sector-shaped wall in the vortex finder with adjustable expansion angle shown;

[0029] Figure 5 for Figure 4 A local enlarged view of region A in the vortex finder with adjustable expansion angle is shown.

[0030] Legend:

[0031] 1. vortex finder body; 101. slide groove; 102. inner pressure hole; 103. outer pressure hole; 104. limit groove; 1041. limit wall; 11. primary vortex finder; 111. annular mounting edge; 112. chamfered hole air inlet; 12. secondary vortex finder; 121. radial air inlet; 13. venturi; 14. vortex finder cover; 141. annular mounting groove;

[0032] 2. Sleeve assembly; 21. Sector-shaped wall surface; 211. Arc-shaped rotating portion; 22. Connecting seat;

[0033] 3. Adjustment assembly; 31. Slider; 32. Compression spring; 33. Driving rod. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0035] Figures 1 to 5 The vortex finder with adjustable expansion angle provided by an embodiment of the present invention is collectively shown, which is used to be installed in an aircraft engine to provide a high-speed rotating airflow for the flame tube of the aircraft engine, and to perform secondary atomization on the fuel sprayed from the fuel nozzle through the strong shear force of the high-speed rotating airflow, which can promote the fuel to be broken into smaller droplets and enhance the fuel atomization performance.

[0036] Please combine Figure 1 and Figure 2 , the vortex finder with adjustable expansion angle includes a vortex finder body 1, a sleeve assembly 2 and an adjustment assembly 3; the sleeve assembly 2 includes a plurality of fan-shaped wall surfaces 21, two adjacent fan-shaped wall surfaces 21 are partially overlapped, and the plurality of fan-shaped wall surfaces 21 are sequentially enclosed along the circumferential direction to form a conical cylindrical structure, and the first end of the conical cylindrical structure is hinged to the outlet end of the vortex finder body 1. It should be understood that the outlet end of the vortex finder body 1 is the end of the vortex finder body 1 along its axial direction where the airflow outlet is provided, and the conical cylindrical structure is used to expand the outlet end of the vortex finder body 1, so as to control the expansion degree of the airflow, control the oil mist field and flow field structure downstream of the fuel nozzle, and further affect the size structure of the central recirculation zone of the combustion chamber.

[0037] Furthermore, the adjusting component 3 is installed on the vortex finder body 1, and the adjusting component 3 is connected to the fan-shaped wall 21 and is used to drive the fan-shaped wall 21 to rotate relative to the vortex finder body 1, thereby driving the expansion angle of the second end of the conical cylindrical structure to expand or contract through the simultaneous outward or inward rotation of multiple fan-shaped walls 21.

[0038] In the vortex finder with adjustable expansion angle, the sleeve assembly 2 is formed by enclosing a conical cylindrical structure through multiple fan-shaped wall surfaces 21, and two adjacent fan-shaped wall surfaces 21 are partially overlapped to form a variable geometry sleeve, so that the expansion angle of the conical cylindrical structure can be flexibly expanded or reduced, and the closed cylindrical structure is kept enclosed during the adjustment process to ensure stable and reliable flow field performance. Therefore, the fan-shaped wall surface 21 is driven to rotate relative to the vortex finder body 1 by the adjustment assembly 3, so that the expansion angle of the second end of the conical cylindrical structure can be expanded or reduced, thereby realizing fine adjustment of the flow field in the working state, improving the comprehensive performance of the combustion chamber, providing a suitable oil-gas mixture for combustion in the flame tube, satisfying the autonomous adjustment of expanding the recirculation zone to enhance ignition and cross-flame performance in a small state and compressing the recirculation zone to reduce the wall temperature in a large state, and can save a large amount of design resources and computing resources for multi-state optimization in the design stage.

[0039] like Figure 3 As shown, a slide groove 101 is provided in the vortex finder body 1, a first end of the slide groove 101 is provided with an inner pressure hole 102 connected to the outlet end of the vortex finder body 1, and a second end of the slide groove 101 is provided with an outer pressure hole 103 for connecting to the atmosphere.

[0040] Preferably, the adjustment component 3 includes a slider 31, a compression spring 32 and a driving rod 33. The slider 31 is arranged in the slide groove 101 and is used to slide along the slide groove 101. The compression spring 32 is pressed between the slider 31 and the first end of the slide groove 101. The first end of the driving rod 33 is hinged to the slider 31, and the second end of the driving rod 33 is hinged to the fan-shaped wall 21.

[0041] Specifically, the first end of the slide groove 101 is set in a direction toward the center of the vortex finder body 1, and the second end of the slide groove 101 is set in a direction away from the center of the vortex finder body 1, so that when the slider 31 is located at the first end of the slide groove 101, the driving rod 33 drives the fan-shaped wall 21 to rotate to a state of maximum expansion angle, and when the slider 31 is located at the second end of the slide groove 101, the driving rod 33 drives the fan-shaped wall 21 to rotate to a state of minimum expansion angle. The rotation stroke of the fan-shaped wall 21 can also be controlled by the length of the slide groove 101, so that the expansion angle of the conical cylindrical structure changes within a reasonable range.

[0042] The compression spring 32 is used to drive the slider 31 to move toward the second end of the slide groove 101, thereby driving the sector-shaped wall 21 to rotate radially outward along the vortex finder body 1 through the driving rod 33 to drive the expansion angle of the second end of the conical cylindrical structure to expand; the internal pressure hole 102 is used to drive the slider 31 to move toward the first end of the slide groove 101 by the negative pressure generated by the vortex finder body 1 during operation, thereby driving the sector-shaped wall 21 to rotate radially inward along the vortex finder body 1 through the driving rod 33 to drive the expansion angle of the second end of the conical cylindrical structure to gradually decrease.

[0043] The working principle of the regulating assembly 3 is as follows: in the ignition state, the internal and external pressure difference of the vortex finder body 1 is small, the slider 31 is located at the second end of the slide groove 101 under the elastic drive of the compression spring 32, and the fan-shaped wall surface 21 is subjected to the radial outward force of the driving rod 33, so that the expansion angle of the conical cylindrical structure is in the maximum state. At this time, the expansion effect on the outlet end of the vortex finder body 1 is strong, and a large recirculation area is formed at the airflow outlet. The oil and gas near the ignition nozzle are relatively high, and the airflow speed is low, which is conducive to the ignition of the combustion chamber and the improvement of the flame-linking performance, and helps the aircraft engine to achieve reliable starting; and in the process of successfully starting normal operation after the ignition is successfully started, as the working state continues to improve, the internal pressure of the vortex finder body 1 The external pressure difference continues to increase, and the air pressure in the internal pressure hole 102 gradually decreases under the negative pressure generated by the high-speed airflow, while the air pressure in the external pressure hole 103 remains unchanged. The slider 31 can continuously compress the compression spring 32 under the pressure, that is, the slider 31 gradually moves along the first end toward the slide groove 101. At this time, the fan-shaped wall 21 is subjected to the radial inward force of the driving rod 33, so that the expansion angle of the conical cylindrical structure is gradually reduced, the airflow expansion effect at the outlet end of the vortex finder body 1 is gradually weakened, and the central recirculation zone is gradually reduced. On the basis of ensuring stable combustion in the main combustion zone, the high-temperature combustion gas residing in the recirculation zone is gradually moved away from the flame tube wall, thereby reducing the flame tube wall temperature and increasing the flame tube life.

[0044] Therefore, the adjustment action of the adjustment component 3 is completely controlled by the force of the internal and external pressure difference of the vortex finder body 1. When the combustion chamber switches to different working states, the vortex finder body 1 can achieve complete autonomous control according to its aerodynamic conditions, and automatically adjust the expansion angle of the conical cylindrical structure to meet the requirements of the head flow field under different working states of the combustion chamber, so that the performance of the combustion chamber under different working states is at the optimal level.

[0045] In other embodiments, the adjustment component 3 may also adopt an electric adjustment structure, for example, including a motor and a transmission component arranged between the motor and the fan-shaped wall 21. The motor drives the fan-shaped wall 21 to rotate relative to the vortex finder body 1 through the transmission component, and can also achieve the expansion angle adjustment of the conical cylindrical structure. The adjustment amplitude can also be manually controlled according to specific parameter requirements during use, so as to adapt to more application scenarios.

[0046] like Figure 1 As shown, preferably, the chute 101 is arranged along the radial direction of the vortex finder body 1, and the internal pressure hole 102 is opened on the side wall of the chute 101 facing the outlet end of the vortex finder body 1 along the axial direction of the vortex finder body 1. This structure can not only enable the internal pressure hole 102 to avoid the end of the compression spring 32, but also enable the compression spring 32 to fully abut the bottom wall of the chute 101 and apply a stable and reliable elastic force to the slider 31, and also enable the internal pressure hole 102 to be arranged along the airflow direction of the vortex finder body 1, so that it is easier to be affected by the airflow of the vortex finder body 1 to generate a pressure difference.

[0047] Preferably, the diameter of the inner pressure hole 102 and the outer pressure hole 103 does not exceed 2 / 3 of the width of the slider 31, and the ratio of the depth to the diameter of the inner pressure hole 102 and the outer pressure hole 103 is not greater than 2 to ensure smooth ventilation.

[0048] like Figure 3 Preferably, a connection seat 22 is provided on the outer side wall of the sector-shaped wall surface 21 at one end away from the vortex finder body 1, and the second end of the driving rod 33 is hinged to the connection seat 22. The connection seat 22 increases the force bearing area of ​​the connection position between the driving rod 33 and the sector-shaped wall surface 21, so that the sector-shaped wall surface 21 can be prevented from being deformed due to excessive concentration of force during the rotation process, so that the driving rod 33 can drive the sector-shaped wall surface 21 to rotate stably and smoothly.

[0049] Furthermore, there are multiple adjustment components 3, and the adjustment components 3 are arranged in a one-to-one correspondence with the sector-shaped wall surface 21, that is, each sector-shaped wall surface 21 is adjusted by an independent adjustment component 3, and the rotation adjustment effect is better and more stable and reliable.

[0050] In this embodiment, the sector-shaped wall surface 21 is provided with three pieces, and the adjustment components 3 are provided with three pieces correspondingly. The three adjustment components 3 are arranged equidistantly along the circumference of the vortex finder body 1 and are connected to the three sector-shaped wall surfaces 21 one by one. The three sector-shaped wall surfaces 21 are arranged in sequence along the circumference and overlapped in pairs to form three splicing gaps. The three sector-shaped wall surfaces 21 can fully enclose the conical cylindrical structure and reduce the number of splicing gaps as much as possible. In other embodiments, the number of the sector-shaped wall surfaces 21 can also be increased according to specific needs.

[0051] Please combine Figure 4 and Figure 5 The outlet end of the vortex finder body 1 is provided with a limiting groove 104, and the fan-shaped wall surface 21 is provided with an arc-shaped rotating portion 211 embedded in the limiting groove 104 and used to rotate along the limiting groove 104, and the limiting groove 104 is provided with a limiting wall 1041 used to limit the maximum rotation stroke of the arc-shaped rotating portion 211. The fan-shaped wall surface 21 can be flexibly rotated by inserting the arc-shaped rotating portion 211 into the limiting groove 104, and the rotation stroke of the fan-shaped wall surface 21 can be limited by the limiting wall 1041, so that the expansion angle of the conical cylindrical structure is controlled within a reasonable range, and the connection structure is simple and efficient, and the fan-shaped wall surface 21 is conveniently and quickly disassembled for repair, maintenance or replacement.

[0052] like Figure 1 As shown, the vortex finder body 1 includes a primary vortex finder 11 and a secondary vortex finder 12 arranged in sequence along the axial direction, and a venturi 13 arranged at the outlet end of the primary vortex finder 11 and extending into the secondary vortex finder 12, and the sleeve assembly 2 and the adjustment assembly 3 are both arranged on the secondary vortex finder 12. That is, the vortex finder body 1 adopts a two-stage vortex finder structure, and the airflow of the primary vortex finder 11 and the secondary vortex finder 12 are separated by the venturi 13. The strong cyclonic airflow formed by the primary vortex finder 11 and the secondary vortex finder 12 enhances the fuel atomization quality, promotes the full mixing of oil and gas, and improves the vortex effect. In other embodiments, the vortex finder body 1 can also adopt a three-stage vortex finder structure to meet different usage requirements.

[0053] Preferably, the vortex finder body 1 further comprises a vortex finder cover plate 14, the vortex finder cover plate 14 is connected to the secondary vortex finder 12, the vortex finder cover plate 14 and the secondary vortex finder 12 enclose an annular mounting groove 141 arranged around the primary vortex finder 11, the primary vortex finder 11 comprises an annular mounting edge 111 arranged in the annular mounting groove 141, the diameter of the annular mounting groove 141 is greater than the diameter of the annular mounting edge 111, and the axial width of the annular mounting groove 141 is equal to the axial width of the annular mounting edge 111. The primary vortex finder 11 can move radially in the annular mounting groove 141, ensuring that the fuel nozzle and the vortex finder body 1 have no radial interference after installation and are matched with a small clearance in the axial direction, so as to ensure that the radial movement will not get stuck.

[0054] Preferably, the first-stage vortex finder 11 is configured as a bevel hole vortex finder, and the second-stage vortex finder 12 is configured as a radial vortex finder. Specifically, a bevel hole air inlet 112 is provided on the side wall of the first-stage vortex finder 11 which is inclined relative to its axis, and a radial air inlet 121 is provided along its radial direction of the second-stage vortex finder 12. The first-stage vortex finder 11 takes in air through the bevel hole air inlet 112, and the second-stage vortex finder 12 takes in air through the radial air inlet 121. Compared with the method of taking in air along the axial direction, the axial length of the vortex finder body 1 can be effectively shortened, the occupied space can be reduced, and it is suitable for small and medium-sized aircraft engines. In addition, the structure is easy to process and has low cost.

[0055] As a second aspect, this embodiment also provides an aircraft engine (not shown in the figure, the same below), including the above-mentioned vortex finder with adjustable expansion angle, because the vortex finder with adjustable expansion angle can actively adjust the size of the expansion angle, realize the fine adjustment of the flow field in the working state, improve the comprehensive performance of the combustion chamber, provide a suitable oil-gas mixture for the combustion in the flame tube, meet the autonomous adjustment of expanding the recirculation zone to enhance the ignition and cross-flame performance in a small state, and compressing the recirculation zone to reduce the wall temperature in a large state, and can save a lot of design resources and computing resources for multi-state optimization in the design stage. Make the performance of the aircraft engine more excellent, more durable, and effectively save design resources.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vortex finder with adjustable expansion angle, characterized in that: It comprises a vortex finder body (1), a sleeve assembly (2) and an adjustment assembly (3); The sleeve assembly (2) comprises a plurality of sector-shaped wall surfaces (21), wherein two adjacent sector-shaped wall surfaces (21) are partially overlapped, and the plurality of sector-shaped wall surfaces (21) are sequentially enclosed in the circumferential direction to form a conical cylindrical structure, wherein a first end of the conical cylindrical structure is hingedly connected to an outlet end of the vortex finder body (1); The adjusting component (3) is mounted on the vortex finder body (1), and the adjusting component (3) is connected to the sector-shaped wall surface (21) and is used to drive the sector-shaped wall surface (21) to rotate relative to the vortex finder body (1), thereby driving the expansion angle of the second end of the conical cylindrical structure to expand or contract.

2. The vortex finder with adjustable expansion angle according to claim 1, characterized in that: The vortex finder body (1) is provided with a chute (101), a first end of the chute (101) is provided with an inner pressure hole (102) connected to the outlet end of the vortex finder body (1), and a second end of the chute (101) is provided with an outer pressure hole (103) for connecting to the atmosphere; The adjusting assembly (3) comprises a slider (31), a compression spring (32) and a driving rod (33); the slider (31) is arranged in the slide groove (101) and is used to slide along the slide groove (101); the compression spring (32) is pressed between the slider (31) and the first end of the slide groove (101); the first end of the driving rod (33) is hinged to the slider (31); and the second end of the driving rod (33) is hinged to the sector-shaped wall surface (21); The compression spring (32) is used to drive the slider (31) to move toward the second end of the slide groove (101), thereby driving the fan-shaped wall surface (21) to rotate radially outwardly along the vortex finder body (1) through the driving rod (33) to drive the expansion angle of the second end of the conical cylindrical structure to expand; the internal pressure hole (102) is used to drive the slider (31) to move toward the first end of the slide groove (101) by the negative pressure generated by the vortex finder body (1) during operation, thereby driving the fan-shaped wall surface (21) to rotate radially inwardly along the vortex finder body (1) through the driving rod (33) to drive the expansion angle of the second end of the conical cylindrical structure to gradually decrease.

3. The vortex finder with adjustable expansion angle according to claim 2, characterized in that: The slide groove (101) is arranged along the radial direction of the vortex finder body (1), and the internal pressure hole (102) is opened along the axial direction of the vortex finder body (1) on the side wall of the slide groove (101) facing the outlet end of the vortex finder body (1).

4. The vortex finder with adjustable expansion angle according to claim 2, characterized in that: A connecting seat (22) is provided on the outer side wall of the sector-shaped wall surface (21) at one end away from the vortex finder body (1), and the second end of the driving rod (33) is hingedly connected to the connecting seat (22).

5. The vortex finder with adjustable expansion angle according to claim 2, characterized in that: A plurality of the adjustment components (3) are provided, and the adjustment components (3) are arranged in one-to-one correspondence with the sector-shaped wall surfaces (21).

6. The vortex finder with adjustable expansion angle according to claim 1, characterized in that: A limiting groove (104) is provided at the outlet end of the vortex finder body (1); an arc-shaped rotating portion (211) is provided on the fan-shaped wall surface (21) and is embedded in the limiting groove (104) and used to rotate along the limiting groove (104); a limiting wall (1041) is provided in the limiting groove (104) and is used to limit the maximum rotation stroke of the arc-shaped rotating portion (211).

7. The vortex finder with adjustable expansion angle according to claim 1, characterized in that: The vortex finder body (1) comprises a primary vortex finder (11) and a secondary vortex finder (12) which are arranged in sequence along the axial direction, and a venturi (13) which is arranged at the outlet end of the primary vortex finder (11) and extends into the secondary vortex finder (12).

8. The vortex finder with adjustable expansion angle according to claim 7, characterized in that: The vortex finder body (1) further comprises a vortex finder cover plate (14) connected to the secondary vortex finder (12); the vortex finder cover plate (14) and the secondary vortex finder (12) enclose an annular mounting groove (141) arranged around the primary vortex finder (11); the primary vortex finder (11) comprises an annular mounting edge (111) arranged in the annular mounting groove (141); the diameter of the annular mounting groove (141) is greater than the diameter of the annular mounting edge (111); and the axial width of the annular mounting groove (141) is equal to the axial width of the annular mounting edge (111).

9. The vortex finder with adjustable expansion angle according to claim 7 or 8, characterized in that: The first-stage vortex finder (11) is configured as a bevel hole vortex finder, and the second-stage vortex finder (12) is configured as a radial vortex finder.

10. An aircraft engine, characterized in that: The invention comprises a vortex finder with adjustable expansion angle as claimed in any one of claims 1 to 9.

Images