Distortion generator

Abstract

The present invention discloses a distortion generator, which includes: a plurality of positioning rods arranged radially between the inner casing and the outer casing of the engine casing along the radial direction of the engine casing; a first magnetic member sleeved on the positioning rods and movable along the length direction of the positioning rods; a distortion member, both ends of the distortion member along the length direction are respectively connected to the first magnetic members of different positioning rods, and the distortion member has elasticity along the length direction; a second magnetic member arranged on the outer casing or the inner casing, and the second magnetic member can drive the first magnetic member to move on the positioning rods in a magnetic induction manner. This distortion generator not only overcomes the defects in the prior art that the structure of the distortion grid is fixed, the compatibility of the distortion grid is poor, and the design, manufacturing and installation costs are high, but also can simulate different total pressure radial distribution laws according to the requirements of different oncoming flow conditions of the engine, which is beneficial to shortening the experimental period of the intake experiment.

Description

Technical Field

[0001] The present invention relates to the field of aero-engine tests, and particularly to a distortion generator. Background Art

[0002] In aero-engine tests, in order to simulate the non-uniform inlet flow condition during the actual operation of an aero-engine under atmospheric inlet conditions, a set of distortion generators (hereinafter referred to as distortion grids) is usually placed at the inlet section of the engine casing to simulate the distribution form of the dimensionless total pressure at the inlet along the radial direction under the design state of the engine.

[0003] Traditionally, the structure of the distortion grid is as Figure 1 shown. Different-diameter metal wires 11' are arranged at different radial positions on the distortion grid 1'. Its design principle is to utilize the different flow losses generated when the air flow passes through the metal wires 11' with different diameters. By arranging the metal wires 11' along the radial direction at the engine inlet section according to a certain rule, the total pressure of the air flow downstream of the metal wires 11' can be distributed regularly along the radial direction. By adjusting the parameters (including diameter and position) of the metal wires 11' when designing the structure of the distortion grid 1', the radial distribution of the total pressure at the target position can meet the design requirements.

[0004] However, the configuration of the distortion grid in the traditional solution is fixed. To adapt to different air flow condition requirements, it is necessary to redesign and manufacture different configurations of distortion grids and reinstall them, resulting in high costs, complex disassembly and assembly, and large time consumption. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a distortion generator to overcome the defects of poor compatibility of the distortion grid and high design, manufacturing and installation costs in the prior art.

[0006] The present invention solves the above technical problem through the following technical solutions:

[0007] A distortion generator is provided in an engine casing. The distortion generator includes:

[0008] A plurality of positioning 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 first magnetic member is sleeved on the positioning rod and is movable along the length direction of the positioning rod;

[0010] A distortion member, both ends of the distortion member along the length direction are respectively connected to the first magnetic members on different positioning rods, and the distortion member has elasticity along the length direction;

[0011] A second magnetic member, which is disposed on the outer casing or the inner casing, and can drive the first magnetic member to move on the positioning rod by means of magnetic induction.

[0012] In this distortion generator, by arranging a second magnetic member on the engine casing, a force is generated on the first magnetic member by means of magnetic induction. At the same time, the distortion member also generates a force on the first magnetic member under the action of its own elastic deformation. The two forces acting on the first magnetic member are dynamically balanced, causing the first magnetic member to displace on the positioning rod, achieving the purpose of changing its position within the engine casing. Since the distortion member is connected to these first magnetic members, the position of the distortion member within the casing can be adjusted. Then, according to the requirements of different oncoming flow conditions of the engine, by controlling the second magnetic member, the position of the distortion member along the radial direction within the engine casing can be changed, simulating different total pressure distribution laws along the radial direction.

[0013] This distortion generator not only overcomes the defects of the existing technology, such as the fixed structure of the distortion net, poor compatibility of the distortion net, and high design, manufacturing, and installation costs, but also can simulate different total pressure distribution laws along the radial direction according to the requirements of different oncoming flow conditions of the engine, which is beneficial to shortening the experimental period of the intake experiment.

[0014] Preferably, both ends of the distortion member are respectively connected to the first magnetic members on adjacent positioning rods.

[0015] Through the above structural arrangement, the difficulty of the distortion member moving within the engine casing can be reduced, enhancing the distortion adjustment effect.

[0016] Preferably, the distortion members are all made of conductive materials, and each distortion member and the first magnetic member form a current loop in a head-to-tail connection manner along the circumferential direction of the engine casing;

[0017] The distortion generator further includes: a power source and a wire. The wire is respectively connected to both ends of the current loop and delivers the power of the power source to the current loop.

[0018] Through the above structural arrangement, by providing a power source and a wire to supply power to each first magnetic member and distortion member, the effect of the first magnetic member and the distortion member generating displacement under the magnetic induction of the second magnetic member is improved.

[0019] Preferably, both ends of the current loop are arranged on the same first magnetic member.

[0020] Through the above structural arrangement, the implementation difficulty of arranging a wire to supply power to the current loop is reduced.

[0021] Preferably, the first magnetic member forming both ends of the current loop is made of an insulating material, and the wires are respectively electrically connected to different distortion members provided on the first magnetic member.

[0022] With the above structural arrangement, a short - circuit between the two wires is completely avoided.

[0023] Preferably, the power supply is arranged outside the outer casing, and the wire extends along the positioning rod to the power supply.

[0024] With the above structural arrangement, the setting of the power supply is prevented from affecting the normal flow of air in the engine casing. At the same time, the wire extends along the direction of the positioning rod, which facilitates the installation and positioning of the wire.

[0025] Preferably, the distortion member is a helical spring.

[0026] With the above structural arrangement, a structural implementation with a simple structure and low cost is provided, enabling the distortion member made of a conductive material to have the characteristic of being able to expand and contract along the length direction, so as to always maintain a tensioned state between the two first magnetic members.

[0027] Preferably, the surface of the distortion member is covered with an elastic rubber tube.

[0028] With the above structural arrangement, for the distortion member of the spring, due to its relatively thin diameter, the distortion effect is not obvious. By sleeving an elastic rubber tube on the outer layer of the spring, the distortion effect is enhanced, and the elastic rubber tube will also stretch as the spring stretches. At the same time, by covering the elastic rubber tube, the electrical conduction between the distortion member and other components is avoided, improving the operation reliability of the distortion generator.

[0029] Preferably, a plurality of the positioning rods are evenly arranged along the circumferential direction of the engine casing, and the number of the positioning rods is greater than or equal to eight.

[0030] With the above structural arrangement, the distribution of each positioning rod in the engine casing is made as uniform as possible, and thus the distribution of the distortion members indirectly positioned on the positioning rods in the engine casing is also made as uniform as possible.

[0031] Preferably, the positioning rod is made of an insulating material.

[0032] With the above structural arrangement, the situation of electrical conduction between the first magnetic member and the positioning rod is completely avoided, improving the operation reliability of the distortion generator.

[0033] Preferably, both ends of the positioning rod are respectively fixed on the inner casing and the outer casing.

[0034] With the above structural arrangement, a relatively preferred structural implementation is provided to enable reliable fixation of the positioning rod.

[0035] The positive and progressive effects of the present invention are as follows:

[0036] In this distortion generator, by arranging a second magnetic member on the engine casing, a force is exerted on the first magnetic member through magnetic induction. Meanwhile, the distortion member also exerts a force on the first magnetic member under the action of its own elastic deformation. The two forces acting on the first magnetic member reach a dynamic balance, causing the first magnetic member to displace on the positioning rod, thereby achieving the purpose of changing its position within the engine casing. Since the distortion member is connected to these first magnetic members, the position of the distortion member within the casing can be adjusted. Furthermore, according to the requirements of different oncoming flow conditions of the engine, by controlling the second magnetic member, the position of the distortion member along the radial direction within the engine casing can be changed, simulating different total pressure radial distribution laws.

[0037] This distortion generator not only overcomes the defects of the prior art, such as the fixed structure of the distortion grid, poor compatibility of the distortion grid, and high design, manufacturing, and installation costs, but also can simulate different total pressure radial distribution laws according to the requirements of different oncoming flow conditions of the engine, which is conducive to shortening the experimental period of the intake experiment. Brief Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of a distortion grid in the prior art.

[0039] Figure 2 It is a schematic structural diagram of the distortion generator in Embodiment 1 of the present invention.

[0040] Figure 3 It is an enlarged partial structural view of the distortion generator in Embodiment 1 of the present invention.

[0041] Figure 4 It is a schematic diagram of the installation position of the second magnetic member in Embodiment 1 of the present invention.

[0042] Description of the Reference Numerals:

[0043] Positioning rod 1

[0044] First magnetic member 2

[0045] Distortion member 3

[0046] Second magnetic member 4

[0047] Wire 5, lead-out end 51

[0048] Inner casing 701

[0049] Outer casing 702 Detailed Description of the Embodiment

[0050] The present invention will be further described below by way of examples, but the present invention is not limited to the scope of the described examples for this reason.

[0051] Embodiment 1

[0052] As Figures 2 - 4 shown, the present invention provides a distortion generator, which is arranged at the engine casing. The distortion generator includes a plurality of positioning rods 1, first magnetic members 2 arranged on each positioning rod 1, a plurality of distortion members 3 and a second magnetic member 4.

[0053] Among them, the engine casing specifically includes an inner casing 701 and an outer casing 702 arranged concentrically. These positioning rods 1 are arranged in the area between the inner casing 701 and the outer casing 702 along the radial direction of the engine casing. Through holes are provided on the first magnetic members 2, and the first magnetic members 2 are sleeved on the corresponding positioning rods 1 through the through holes, so that the first magnetic members 2 can move along the length direction of the positioning rods 1. The two ends of the distortion member 3 along its own length direction are respectively connected to the first magnetic members 2 on different positioning rods 1. These distortion members 3 are elastic along the length direction, so that the distortion member 3 located between the two first magnetic members 2 remains in a tension state. The second magnetic member 4 is arranged on the engine casing, and the second magnetic member 4 can drive the first magnetic member 2 to move on the positioning rod 1 by means of magnetic induction.

[0054] For this distortion generator, by arranging the second magnetic member 4 on the engine casing to generate a force on the first magnetic member 2 by means of magnetic induction, and the distortion member 3 also generates a force on the first magnetic member 2 under the action of its own elastic deformation. The two forces received by the first magnetic member 2 are dynamically balanced, causing the first magnetic member 2 to displace on the positioning rod 1, achieving the purpose of changing its position in the engine casing. Since the distortion member 3 is connected to these first magnetic members 2, the position of the distortion member 3 in the casing can be adjusted. Furthermore, according to the requirements of different oncoming flow conditions of the engine, by controlling the second magnetic member 4, the position of the distortion member 3 in the engine casing along its radial direction can be changed to simulate different total pressure radial distribution laws.

[0055] This distortion generator not only overcomes the defects in the prior art that the distortion net structure is fixed, the distortion net has poor compatibility, and the design, manufacturing and installation costs are high, but also can simulate different total pressure radial distribution laws according to the requirements of different oncoming flow conditions of the engine, which is beneficial to shortening the experimental period of the intake experiment.

[0056] Specifically, as Figure 4 shown, the second magnetic member 4 in this embodiment is arranged on the outer side of the outer casing 702 to avoid occupying the air flow channel space inside the outer casing 702. The second magnetic member 4 is mainly composed of closely wound coils. By energizing the closely wound coils, the second magnetic member 4 can form an induced magnetic field.

[0057] As shown Figure 3 in the figure, the magnetic field generated by the second magnetic member 4 acts on each of the first magnetic members 2 to generate a force on the first magnetic member 2 that moves in the direction of the outer casing 702, causing it to have a tendency to move in the direction of the large radius (towards the outer casing 702). At the same time, the distortion member 3 is in a tensioned state, and its tension force acts on the first magnetic member 2, causing it to have a tendency to move in the direction of the small radius (towards the inner casing 701). The two balance each other, so that by changing the magnitude of the magnetic field generated by the second magnetic member 4, the purpose of moving the first magnetic member 2 to a specific position in a specific direction is achieved.

[0058] Specifically, when the magnetic field generated by the closely wound coil of the second magnetic member 4 increases, under the action of the magnetic field, the first magnetic member 2 and the distortion member 3 move in the direction of the large radius along the direction of the positioning rod 1. Conversely, when the magnetic field generated by the closely wound coil of the second magnetic member 4 decreases, under the action of the elastic restoring force of the distortion member 3, the first magnetic member 2 and the distortion member 3 move in the direction of the small radius along the direction of the positioning rod 1, thereby realizing the automatic adjustment of the distortion generator, saving labor costs and improving the test efficiency.

[0059] In this embodiment, there are a total of 12 positioning rods 1, which are evenly arranged at equal angles along the circumferential direction of the engine casing.

[0060] Among them, in this embodiment, these 12 positioning rods 1 are evenly arranged at equal angles along the circumferential direction of the engine casing, and both ends of the distortion member 33 are respectively connected to the first magnetic members 2 on adjacent positioning rods 1, so as to give a layout scheme of how to form a distortion net shape for simulating the ring of the traditional distortion net. Of course, in other embodiments, the number of positioning rods 1 is more than 8. In the case where the distortion members 3 are continuously arranged, the circular shape of the traditional distortion net can basically be simulated. At the same time, in order to better simulate the circular shape, the positions of the two first magnetic members 2 connected to both ends of the same distortion member 3 on their respective positioning rods 1 should also be the same, so that the distortion member 3 remains straight, so that through a plurality of continuously arranged distortion members 3, the figure formed by each distortion member 33 is close to concentric circles with the same radius, and the simulation parameters applied to the traditional distortion net can also be directly used in this distortion generator, with good compatibility and consistency.

[0061] To improve the effect of the second magnetic member 4 driving the first magnetic member 2 and the distortion member 3 to generate displacement, in this embodiment, by energizing the first magnetic member 2 and the distortion member 3, the effect of the first magnetic member 2 and the distortion member 3 moving under the influence of magnetic induction is improved. For the specific structure, see Figure 2 and Figure 3, these distortion components 3 are all made of conductive materials. Each distortion component 3 and the first magnetic component 2 are connected in a head-to-tail manner along the circumferential direction of the engine casing to form a current loop for current to flow in the circumferential direction. The distortion generator further includes a power source (not shown in the figure) and wires 5. Among them, the two wires 5 are respectively connected to both ends of the current loop (see Figure 3 ), and are used to deliver the power from the power source to the current loop, so that the first magnetic component 2 and the distortion component 3 on the current loop are in an energized state. At this time, the positioning rod 1 is preferably made of an insulating material to avoid problems such as short circuits.

[0062] More preferably, the distortion component 3 is a helical spring made of a metal material, so as to provide an implementation scheme with a simple structure and low cost, so that the distortion component 3 made of a conductive material has the characteristics of being able to stretch, compress or rebound along the length direction, so that when the distortion component 3 is installed between the two first magnetic components 2, the distortion component 3 can always remain in a tensioned state when the first magnetic component 2 moves.

[0063] At the same time, the energized helical spring can also generate a magnetic field, so that the effect of the second magnetic component 4 acting on and driving the displacement of the distortion component 3 is further enhanced.

[0064] Among them, in this embodiment, both ends of the current loop are located on the same first magnetic component 2a, and the wires 5 are respectively arranged at both ends of the first magnetic component 2 to be electrically connected to the ends of different distortion components 3, so that the current loop can be energized. The material of the first magnetic component 2 can be completely made of an insulating material to completely avoid short circuits between the two wires 5. And other first magnetic components 2 except the first magnetic component 2a can be made of conductive materials (such as metals, etc.) to facilitate forming a complete current loop with each distortion component 3. Specifically, the shape of the first magnetic component 2 is a ring to achieve the purpose of sleeving on the positioning rod 1 and connecting two distortion components 3 respectively, and the structure is simple.

[0065] As Figure 2 shown, the distortion generator in this embodiment includes three current loops. These three current loops are concentrically arranged, and are respectively composed of three groups of first magnetic components 2 and distortion components 3 arranged relatively concentrically. The lead-out ends 51 of the wires 5 are led to the outside of the outer casing 702 for connection to the power source. The three current loops are in a parallel relationship (see Figure 3 ), which is convenient for the power source to supply power to these three current loops at the same time.

[0066] In addition, in this embodiment, an elastic rubber tube (not shown in the figure) is also covered on the surface of the distortion member 3. The specific reason is as follows: Since the diameter of the helical spring is relatively thin and the distortion effect generated is not obvious, an elastic rubber tube is sleeved on the outer layer of the spring to enhance the distortion effect, and the elastic rubber tube will also be stretched as the spring is stretched. At the same time, by covering the elastic rubber tube, the electrical conduction between the distortion member 3 and other components is avoided, improving the operation reliability of the distortion generator.

[0067] Embodiment 2

[0068] This embodiment also provides a distortion generator, whose structure is substantially the same as that of the distortion generator provided in Embodiment 1. The difference is that in this embodiment, no current loop is formed between the first magnetic member and the distortion member. The material of the first magnetic member is made of a magnetic material to generate displacement under the action of the magnetic field generated by the second magnetic member, achieving the purpose of distortion adjustment. The distortion generator of this embodiment has a simpler and more compact structure and relatively higher operation reliability.

[0069] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A distortion generator is provided in an engine casing, characterized in that, The distortion generator includes: A plurality of positioning rods, and the plurality of positioning rods are arranged radially along the engine casing between the inner casing and the outer casing of the engine casing; A first magnetic member, which is sleeved on the positioning rod and is movable along the length direction of the positioning rod; A distortion member, and two ends of the distortion member in the length direction are respectively connected to the first magnetic members of different positioning rods, and the distortion member has elasticity in the length direction; A second magnetic member, which is arranged on the outer casing or the inner casing, and the second magnetic member can drive the first magnetic member to move on the positioning rod by means of magnetic induction.

2. The distortion generator according to claim 1, wherein Two ends of the distortion member are respectively connected to the first magnetic members of adjacent positioning rods.

3. The distortion generator according to claim 2, wherein The distortion members are all made of conductive materials, and each distortion member and the first magnetic member form a current loop in a head-to-tail connection manner along the circumferential direction of the engine casing; The distortion generator further includes: a power source and a wire, and the wire is respectively connected to both ends of the current loop and delivers the power of the power source to the current loop.

4. The distortion generator according to claim 3, characterized in that, Both ends of the current loop are arranged on the same first magnetic member.

5. The distortion generator according to claim 4, characterized in that, The first magnetic members forming both ends of the current loop are made of insulating materials, and the wire is respectively electrically connected to different distortion members arranged on the first magnetic member.

6. The distortion generator according to claim 3, wherein, The power source is arranged outside the outer casing, and the wire extends along the positioning rod to the power source.

7. The distortion generator according to claim 3, characterized in that, The distortion member is a spiral spring.

8. The distortion generator according to claim 7, wherein, The surface of the distortion member is covered with an elastic rubber tube.

9. The distortion generator according to claim 2, wherein, The plurality of positioning rods are uniformly arranged along the circumferential direction of the engine casing, and the number of the positioning rods is greater than or equal to eight.

10. The distortion generator according to any one of claims 3-9, characterized in that, The positioning rod is made of insulating materials.

11. The distortion generator according to any one of claims 1-9, characterized in that, Both ends of the positioning rod are respectively fixed on the inner casing and the outer casing.

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