distortion generator

Abstract

The application discloses a distortion generator arranged in an engine case, which comprises a plurality of threaded rods arranged between an inner case and an outer case of the engine case along the radial direction of the engine case, nuts arranged on and engaged with the threaded rods, distortion members respectively connected to the nuts of different threaded rods at two ends along the length direction, the distortion members being elastic along the length direction, and a driving mechanism connected to the threaded rods and used for driving the threaded rods to rotate. When the driving mechanism drives the threaded rods to rotate, the position of the nut arranged on the threaded rod in the engine case can be changed, the distortion member connected to the nut is stretched or shrunk, and the position of the distortion member in the engine case is changed, so that the adjustment of the position of the distortion structure in the case is realized, different total pressure radial distribution rules are simulated, and the experimental period of an air intake experiment is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engine test, in particular to a distortion generator. BACKGROUND

[0002] In aero-engine test, in order to simulate the inlet non-uniform flow condition of the actual aero-engine working under the atmospheric inlet condition, a set of distortion generator (hereinafter referred to as distortion net) is usually placed at the inlet section of the engine casing for simulating the inlet non-dimensional total pressure distribution along the radial direction under the design state of the engine.

[0003] The traditional structure of the distortion net is shown in Figure 1 Different diameter metal wires 11' are arranged at different positions along the radial direction on the distortion net 1', and the design principle is to use the flow loss generated by the airflow flowing through the metal wires 11' of different diameters to make the total pressure of the airflow downstream of the metal wires 11' along the radial direction be regularly distributed. By adjusting the parameters (including diameter and position) of the metal wires 11' when designing the structure of the distortion net 1', the radial distribution of the total pressure at the target position can meet the design requirements.

[0004] However, the configuration of the traditional distortion net is fixed, and in order to adapt to different airflow conditions, different configurations of distortion nets need to be redesigned and manufactured, and then reinstalled, which results in high cost, complex disassembly and assembly, and large time consumption. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defects of poor compatibility, high design, manufacturing and installation cost of the existing distortion net, and to provide a distortion generator.

[0006] The present application solves the above technical problems by the following technical solutions:

[0007] A distortion generator is arranged in an engine casing, and the distortion generator comprises:

[0008] A plurality of threaded rods are arranged between the inner casing and the outer casing of the engine casing along the radial direction of the engine casing;

[0009] A nut is arranged and engaged on the threaded rod;

[0010] A distortion member is connected to the nuts of different threaded rods at both ends along the length direction, and the distortion member has elasticity along the length direction;

[0011] A driving mechanism is connected to the threaded rod and used to drive the threaded rod to rotate.

[0012] The distortion generator can change the position of the nut arranged on the threaded rod in the engine casing when the driving mechanism drives the threaded rod to rotate, so that the distortion member connected with the nut is stretched or shrunk, and the position of the distortion member in the engine casing is changed, so that the position of the distortion structure in the engine casing is adjusted, and then according to the different flow conditions required by the engine, the position of the distortion member in the engine casing along the radial direction is changed by controlling the driving mechanism, so that different total pressure radial distribution rules are simulated.

[0013] The distortion generator not only overcomes the defects of the prior art that the distortion net structure is fixed and cannot be changed, the distortion net compatibility is poor, and the design, manufacturing and installation costs are high, but also can simulate different total pressure radial distribution rules according to the different flow conditions required by the engine, which is beneficial to shorten the experimental period of the intake experiment.

[0014] Preferably, the threaded rods are uniformly arranged along the circumferential direction of the engine casing, and the number of the threaded rods is greater than or equal to eight.

[0015] Through the above structure, the distribution of the threaded rods in the engine casing is as uniform as possible, and then the distribution of the distortion members indirectly positioned on the threaded rods in the engine casing is also as uniform as possible.

[0016] Preferably, the two ends of the distortion member are respectively connected to the nuts of the adjacent threaded rods.

[0017] Through the above structure, the difficulty of moving the distortion member in the engine casing can be reduced, so as to enhance the distortion adjustment effect.

[0018] Preferably, the distortion generator further comprises a linkage mechanism, the driving mechanism is connected to all the threaded rods through the linkage mechanism, and the linkage mechanism can drive all the threaded rods to rotate synchronously.

[0019] Through the above structure, the nuts on the threaded rods can move on the threaded rods at the same speed, so that the adjustment consistency of the distortion generator is good, and the implementation of the intake experiment is more convenient.

[0020] Preferably, the positions of the two nuts connected with the same distortion member on the threaded rods are the same.

[0021] Through the above structure, when the number of the threaded rods is greater than or equal to eight, the figure surrounded by the distortion members in the engine casing is close to concentric circles with the same radius, so as to simulate the configuration that the traditional distortion net is arranged in the form of concentric circles, and the simulation parameters applied to the traditional distortion net can be directly used in the distortion generator, so that the compatibility and consistency are good.

[0022] Preferably, a plurality of said nuts are arranged on the single threaded rod, and the plurality of said nuts are respectively connected to different said distortion members.

[0023] Through the above structure, the number of distortion members that can be adjusted by a single threaded rod is increased, thereby increasing the number of distortion members in the engine case, and further meeting the requirements of air intake experiments.

[0024] Preferably, the driving mechanism and the linkage mechanism are located on the inner side of the inner case, and the threaded rod penetrates the surface of the inner case and is connected to the linkage mechanism.

[0025] Through the above structure, the driving mechanism and the linkage mechanism occupy the outer space of the engine case.

[0026] Preferably, the distortion member is made of metal.

[0027] Through the above structure, the strength and durability of the distortion member are improved.

[0028] Preferably, the distortion member is a spiral spring.

[0029] Through the above structure, a simple and low-cost implementation scheme is provided, and the distortion member made of metal has the characteristic of being able to stretch along the length direction to maintain tension between the two nuts.

[0030] Preferably, the surface of the distortion member is covered with an elastic rubber tube.

[0031] Through the above structure, the distortion effect of the metal spring is not obvious due to the small diameter, and the elastic rubber tube is sleeved on the outer layer of the metal spring to enhance the distortion effect, and the elastic rubber tube will also stretch with the stretching of the spring.

[0032] Preferably, the two ends of the threaded rod are respectively connected to the inner case and the outer case.

[0033] Through the above structure, a more preferred structure implementation scheme is provided, and the threaded rod is reliably fixed.

[0034] Preferably, the driving mechanism is arranged on the inner side of the inner case or the outer side of the outer case.

[0035] Through the above structure, the arrangement of the driving mechanism does not affect the normal air intake of the engine case.

[0036] The positive progress effect of the present application is that:

[0037] The distortion generator can change the position of the nut arranged on the threaded rod in the engine casing when the driving mechanism drives the threaded rod to rotate, so that the distortion member connected with the nut is stretched or shrunk, and the position of the distortion member in the engine casing is changed, so that the position of the distortion structure in the casing is adjusted, and then according to the different flow conditions required by the engine, the position of the distortion member in the engine casing along the radial direction is changed by controlling the driving mechanism, so that different total pressure radial distribution rules are simulated.

[0038] The distortion generator not only overcomes the defects of the prior art that the distortion net structure is fixed and unchanged, the distortion net compatibility is poor, and the design, manufacturing and installation costs are high, but also can simulate different total pressure radial distribution rules according to the different flow conditions required by the engine, which is beneficial to shorten the experimental period of the intake experiment. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the distortion net of the prior art.

[0040] Figure 2 It is a structural schematic diagram of the distortion generator of an embodiment of the present application.

[0041] Figure 3 It is a structural schematic diagram of the nut of an embodiment of the present application.

[0042] Figure 4 It is a structural schematic diagram of the linkage mechanism of an embodiment of the present application.

[0043] Figure 5 It is a schematic diagram of the positioning relationship between the threaded rod and the outer casing of an embodiment of the present application.

[0044] BRIEF DESCRIPTION OF DRAWINGS

[0045] Threaded rod 1, driving end 11, positioning end 12

[0046] Nut 2, inner threaded body 21, ear-shaped connecting seat 22

[0047] Distortion member 3

[0048] Driving mechanism 4

[0049] Linkage mechanism 5

[0050] Inner casing 701

[0051] Outer casing 702 DETAILED DESCRIPTION

[0052] The present application will be further described below by way of examples, but the present application is not limited in the scope of the described examples.

[0053] As Figure 2As shown, the present application provides a distortion generator which is arranged at the engine casing. The distortion generator comprises a plurality of threaded rods 1, a plurality of nuts 2 arranged on each threaded rod 1, a plurality of distortion members 3 and a driving mechanism 4.

[0054] In the embodiment, there are 12 threaded rods 1 which are evenly arranged along the circumferential direction of the engine casing at equal angles, one end of each threaded rod 1 extends to the inner casing 701 and the other end extends and is positioned on the outer casing 702. Four nuts 2 are arranged on each threaded rod 1, the nuts 2 are engaged on the threads on the surface of the threaded rod 1, and the distortion member 3 is connected to different nuts 2 at both ends along the length direction of the distortion member 3, and the two nuts 2 are located on different threaded rods 1. Moreover, the distortion member 3 is elastic and contractible along the length direction of the distortion member 3, so that the distortion member 3 remains in a straight state when connected to the two nuts 2. The driving mechanism 4 is connected to the threaded rod 1, and the driving mechanism 4 is used to drive the threaded rod 1 to rotate, so as to drive the nuts 2 to move on the threaded rod 1.

[0055] Specifically, the distortion generator drives the threaded rod 1 to rotate by the driving mechanism 4, so as to change the position of the nut 2 arranged on the threaded rod 1 in the engine casing, stretch or contract the distortion member 3 connected to the nut 2, and change the position of the distortion member 3 in the engine casing, so as to adjust the position of the distortion structure in the casing, and then change the position of the distortion member 3 in the radial direction of the engine casing according to the different flow conditions of the engine, so as to simulate different total pressure distribution rules along the radial direction.

[0056] The distortion generator not only overcomes the defects of the prior art that the distortion net structure is fixed and cannot be changed, the distortion net has poor compatibility, and the design, manufacturing and installation costs are high, but also can simulate different total pressure distribution rules along the radial direction according to the different flow conditions of the engine. At the same time, the distortion generator does not need to be manually removed and reinstalled, which saves the labor cost and improves the test efficiency, and is beneficial to shorten the experimental period of the intake experiment.

[0057] In the embodiment, the 12 threaded rods 1 are evenly arranged at equal angles along the circumferential direction of the engine case, and the two ends of the distortion member 3 are connected to the nuts 2 of the adjacent threaded rods 1, so as to give a layout scheme for forming the distortion net shape, for simulating the traditional distortion net ring. Of course, in other embodiments, the number of threaded rods 1 is more than 8, and in the case of continuous arrangement of the distortion member 3, the traditional distortion net ring shape can be basically simulated. At the same time, in order to better simulate the ring shape, the positions of the two nuts 2 connected to the two ends of the same distortion member 3 on the respective threaded rods 1 should also be the same, so that the distortion member 3 remains flat, so that the continuous arrangement of the plurality of distortion members 3 makes the figure surrounded by each distortion member 3 close to the concentric circle with the same radius, and the simulation parameters applied to the traditional distortion net can be directly used in the distortion generator, and the compatibility and consistency are good.

[0058] In addition, the material of the traditional distortion net is metal, and therefore, the material of the distortion member 3 in the embodiment is also preferably metal. In order to simply and reliably solve the problem of how the distortion member 3 made of metal has elasticity and can be contracted, the distortion member 3 in the embodiment is a metal spiral spring, so as to remain in a tensioned state when the nuts 2 on both sides move relative to the threaded rod 1.

[0059] In addition, the outer layer of the spiral spring is wrapped with an elastic rubber tube (not shown in the figure), so as to increase the diameter of the spiral spring and enhance the distortion effect, and the elastic rubber tube will also stretch with the stretching of the spring.

[0060] The cross-sectional view of the specific structure of the nut 2 in the embodiment is shown in Figure 3 The nut 2 includes an internal thread 21 and two side ear-shaped connecting seats 22. The internal thread 21 is used for threaded connection to the threaded rod 1, so as to produce displacement relative to the threaded rod 1 when the threaded rod 1 rotates. The two side ear-shaped connecting seats 22 are used for connecting to the end of the distortion member 3. Since the distortion member 3 in the embodiment is a metal spiral spring, a metal hook can be arranged at the end of the distortion member 3 to hang in the through hole in the middle of the ear-shaped connecting seat 22, so as to achieve the purpose of quick disassembly and facilitate maintenance and replacement.

[0061] In the embodiment, the 12 threaded rods 1 are synchronously rotated, and therefore, the distortion generator further includes a linkage mechanism 5 as shown in Figure 2 The driving mechanism 4 is connected to the driving end 11 of each threaded rod 1 on the inner case 701 side through the linkage mechanism 5, so that the linkage mechanism 5 drives all the threaded rods 1 to rotate synchronously under the driving of the driving mechanism 4, so that the nuts 2 on each threaded rod 1 simultaneously and at the same speed produce displacement, which is convenient for the adjustment of the distortion generator.

[0062] The linkage mechanism 5 in the embodiment is arranged at the inner side of the inner casing 701, and the specific structure is shown in Figure 4 The transmission teeth on the rack are arranged as shown in Figure 4 The driving end 11 of each threaded rod 1 is provided with a circular gear, which is engaged with the circular rack. The driving mechanism 4 is a motor, and the circular gear of the driving shaft of the motor is also engaged with the circular rack. Through the rotation of the driving shaft, the linkage mechanism 5 is driven in the direction indicated by the arrow in Figure 4 , and each threaded rod 1 is driven to rotate synchronously. By enabling the nut 2 on the threaded rod 1 to move on the threaded rod 1 at the same speed, the adjustment consistency of the distortion generator is good, and the air intake experiment is more convenient to implement.

[0063] The driving mechanism 4 and the linkage mechanism 5 are located at the inner side of the inner casing 701, and the driving end 11 of the threaded rod 1 penetrates the surface of the inner casing 701 and is connected to the linkage mechanism 5. Through the above structure, the driving mechanism 4 and the linkage mechanism 5 do not occupy the external space of the engine casing.

[0064] Of course, in other embodiments, the linkage mechanism 5 can also adopt other transmission structure forms existing in the prior art to achieve the purpose of driving each threaded rod 1 to rotate synchronously and at the same speed.

[0065] In the embodiment, as shown in Figure 5 , the positioning end 12 of each threaded rod 1 is positioned at the inner side of the outer casing 702. Through the face contact between the protruding block at the positioning end 12 and the outer casing 702, the purpose of rotational positioning is achieved, and the stability of the positioning and adjustment of each threaded rod 1 can be effectively ensured.

[0066] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A distortion generator disposed in an engine casing, characterized in that, The distortion generator includes: A plurality of threaded rods are arranged radially between the inner and outer casings of the engine casing; A nut, which is disposed on the threaded rod and engages with the thread of the threaded rod; A deformable component, wherein both ends of the deformable component along its length are respectively connected to the nuts of different threaded rods, and the deformable component is elastic along its length; A drive mechanism is connected to the threaded rod and is used to drive the threaded rod to rotate.

2. The distortion generator as described in claim 1, characterized in that, Several of the threaded rods are evenly arranged along the circumference of the engine casing, and the number of the threaded rods is greater than or equal to eight.

3. The distortion generator as described in claim 2, characterized in that, The two ends of the deformed component are respectively connected to the nuts of the adjacent threaded rods.

4. The distortion generator as described in claim 3, characterized in that, The distortion generator also includes a linkage mechanism, and the drive mechanism is connected to all the threaded rods simultaneously through the linkage mechanism. The linkage mechanism can drive all the threaded rods to rotate synchronously.

5. The distortion generator as described in claim 4, characterized in that, The two nuts of the same deformed component are positioned in the same place on the threaded rod.

6. The distortion generator as described in claim 4, characterized in that, A plurality of nuts are provided on a single threaded rod, and the plurality of nuts are respectively connected to different deformed parts.

7. The distortion generator as described in claim 4, characterized in that, Both the drive mechanism and the linkage mechanism are located inside the inner casing, and the threaded rod passes through the surface of the inner casing and is connected to the linkage mechanism.

8. The distortion generator as described in claim 1, characterized in that, The distorting component is made of metal.

9. The distortion generator as described in claim 8, characterized in that, The deformed component is a helical spring.

10. The distortion generator as described in claim 9, characterized in that, The surface of the deformed component is covered with an elastic rubber tube.

11. The distortion generator according to any one of claims 1-10, characterized in that, The two ends of the threaded rod are respectively connected to the inner casing and the outer casing.

12. The distortion generator according to any one of claims 1-10, characterized in that, The drive mechanism is located on the inside of the inner casing or on the outside of the outer casing.

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