Flow pulsation generator

Abstract

The present invention relates to the technical field of experimental research on the dynamic characteristics of liquid rocket engine nozzle injection, and particularly relates to a flow pulsation generator. The flow pulsation generator provided by the present invention mainly includes a generator main body, a rotor unit, a flow amplitude modulation unit, and a driving mechanism. Among them, the rotor unit is located in the first installation through hole of the generator main body and is rotationally connected to the generator main body. The flow amplitude modulation unit is located in the second installation through hole of the generator main body and forms a flow regulation area with the rotor unit. Moreover, the flow amplitude modulation unit can move closer to or away from the rotor unit in the radial direction. The driving mechanism is connected to the rotor unit and drives the rotor unit to rotate, so that different parts of the rotor unit form a flow regulation area with the flow amplitude modulation unit to adjust the cross-sectional area of the flow regulation area. The flow pulsation generator provided by the present invention has diverse oscillation forms, can achieve pulsation regulation with different amplitudes, and has a compact structure with a smaller space occupancy rate.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental research on the injection dynamic characteristics of liquid rocket engine nozzles, and particularly to a flow pulsation generator. Background Art

[0002] With the development of scientific and technological research, in the technical field of experimental research on the injection dynamic characteristics of liquid rocket engine nozzles, especially the research on flow pulsation generators, the injection dynamic characteristics under flow pulsation conditions with high frequency and large amplitude have received more and more research. Therefore, the demand and requirements for flow pulsation generators are also getting higher and higher.

[0003] Currently, the common flow pulsation generator drives a disk on a rotating shaft by a motor, so that the through holes on the disk communicate or close with the liquid flow channel in the sleeve at a certain period. Thus, by controlling the on-off of the liquid flow channel, the liquid flow rate oscillates in an approximately sinusoidal law. However, this kind of flow pulsation generator has the following problems: (1) Based on this periodic connection or closing method, this kind of flow pulsation generator can only generate oscillations in an approximately sinusoidal law, and the oscillation form is single and will not change with the change of the shape of the rotating shaft and the disk; (2) This kind of flow pulsation generator itself does not have the ability to adjust the pulsation amplitude, and can only obtain pulsations with different amplitudes by adjusting the valve opening before entering the flow pulsation generator; (3) This kind of flow pulsation generator will have a relatively large overall volume due to the presence of the disk and cannot be used in a smaller space.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The present invention provides a flow pulsation generator to solve the technical problems of the existing flow pulsation generator with a single oscillation form, inability to achieve pulsations with different amplitudes, and large space occupation.

[0006] The present invention provides a flow pulsation generator, including: a generator main body, formed with a fluid channel, a first installation through hole and a second installation through hole, the first installation through hole and the second installation through hole are respectively located on both sides of the fluid channel in the radial direction of the fluid channel and communicate with the fluid channel; a rotor unit, arranged in the first installation through hole and rotatably connected to the generator main body; a flow amplitude modulation unit, arranged in the second installation through hole and enclosing a flow regulation area with the rotor unit, and the flow amplitude modulation unit is arranged to be able to move closer to or away from the rotor unit in the radial direction to adjust the opening degree of the flow regulation area; and a driving mechanism, connected to the rotor unit and driving the rotor unit to rotate, so that different parts of the rotor unit enclose a flow regulation area with the flow amplitude modulation unit to adjust the flow channel cross-sectional area of the flow regulation area.

[0007] In some embodiments, the rotor unit has a plurality of adjusting surfaces with the same structure that are sequentially connected along its circumferential direction; the driving mechanism drives the rotor unit to rotate, so that the plurality of adjusting surfaces can sequentially form a flow rate adjustment area with the flow rate amplitude modulation unit, to periodically adjust the cross-sectional area of the flow channel in the flow rate adjustment area.

[0008] In some embodiments, the rotor unit includes a rotating shaft, the rotating shaft passes through the first installation through hole and is rotatably connected to the generator body, and the rotating shaft has a plurality of adjusting surfaces with the same structure that are sequentially connected along its circumferential direction; or the rotor unit includes a rotating shaft, a runner and a connecting member, the rotating shaft passes through the first installation through hole and is rotatably connected to the generator body, the runner is sleeved on the rotating shaft and connected to the rotating shaft through the connecting member, and the runner has a plurality of adjusting surfaces that are sequentially connected along its circumferential direction.

[0009] In some embodiments, both axial ends of the rotating shaft are rotatably connected to the generator body through bearings.

[0010] In some embodiments, the plurality of adjusting surfaces are sequentially connected and enclose a regular polygon structure or an undulating structure.

[0011] In some embodiments, the flow rate amplitude modulation unit includes: an amplitude modulation slider disposed in the second installation through hole and provided with a threaded hole; and an amplitude modulation block including a connecting portion and a screw portion, the connecting portion is located outside the second installation through hole and connected to the generator body, the screw portion is located in the second installation through hole and is threadedly connected to the amplitude modulation slider through the threaded hole; wherein, by adjusting the depth of the screw portion screwed into the threaded hole, the amplitude modulation slider can move radially in the second installation through hole.

[0012] In some embodiments, the flow rate amplitude modulation unit further includes a stroke control member fixedly disposed in the threaded hole; the screw portion includes a connecting section and a limiting section protruding from the connecting section along the circumference of the connecting section, the connecting section passes through the stroke control member, the limiting section is located on the side of the stroke control member away from the connecting portion and is threadedly connected to the threaded hole, and the limiting section can abut against the stroke control member to limit the radial movement stroke of the amplitude modulation slider.

[0013] In some embodiments, the driving mechanism includes: a mounting housing located at one end of the generator body in the axial direction of the first installation through hole and hermetically connected to the generator body; a magnetic coupling connector mounted on the mounting housing and connected to the rotor unit; and a driving assembly connected to the magnetic coupling connector to drive the rotor unit to rotate through the magnetic coupling connector.

[0014] In some embodiments, the magnetic coupling connector includes: a magnetic coupling outer rotor disposed outside the mounting housing and connected to the driving assembly; and a magnetic coupling inner rotor disposed inside the mounting housing and connected to the rotor unit, and the magnetic coupling inner rotor rotates under the magnetic force of the magnetic coupling outer rotor to drive the rotor unit to rotate.

[0015] In some embodiments, the flow pulsation generator further includes: a mounting base for mounting the generator body; an end cap axially disposed at one end of the generator body away from the magnetic coupling connector along the first mounting through hole and sealingly connected to the generator body; and two pipe connectors respectively axially disposed at both ends of the fluid passage and connected to the generator body.

[0016] In some embodiments, the flow pulsation generator further includes: a first seal for sealingly connecting the amplitude adjustment block and the generator body between the amplitude adjustment block and the generator body; a second seal for sealingly connecting the mounting housing and the generator body between the mounting housing and the generator body; and a third seal for sealingly connecting the end cap and the generator body between the end cap and the generator body.

[0017] In some embodiments, the drive assembly includes: a mounting bracket connected to the mounting base; and a drive motor disposed on the mounting bracket.

[0018] In some embodiments, the fluid in the fluid passage of the flow pulsation generator is a liquid for simulating the flow pulsation of a liquid rocket engine nozzle.

[0019] The flow pulsation generator provided by the present invention has at least the following beneficial effects compared with the prior art:

[0020] Through the structural design of the flow pulsation generator, the flow pulsation generator includes a generator body, a rotor unit, a flow amplitude modulation unit and a drive mechanism. The generator body is formed with a fluid passage for fluid to pass through, a first mounting through hole for mounting the rotor unit and a second mounting through hole for mounting the flow amplitude modulation unit. Among them, the first mounting through hole and the second mounting through hole are respectively located on both sides of the fluid passage in the radial direction of the fluid passage and communicate with the fluid passage, so that the cross-section of the fluid passage along the axial direction can largely coincide with the cross-sections of the first mounting through hole and the second mounting through hole along the radial direction, which is beneficial to broadening the area of the flow regulation area surrounded by the flow amplitude modulation unit and the rotor unit, and prompting the fluid to have a wider amplitude range;

[0021] The rotor unit is arranged in the first installation through-hole and is rotatably connected to the generator body, and is connected to the driving mechanism to rotate in the first installation through-hole under the drive of the driving mechanism. The flow amplitude modulation unit is arranged in the second installation through-hole and encloses a flow regulation area with the rotor unit. The flow amplitude modulation unit can move closer to or away from the rotor unit in the radial direction of the fluid channel to occupy different flow channel cross-sectional areas of the fluid channel, so as to realize the adjustment of the opening degree of the flow regulation area and facilitate the acquisition of pulsations with different amplitudes. In addition, the rotor unit rotates in the first installation through-hole under the drive of the driving mechanism. Different parts of the rotor unit can enclose a flow regulation area with the flow amplitude modulation unit during the rotation process. During the rotation process of the rotor unit, the cross-sectional area of the flow regulation area can change, so that the fluid flow supplied by the generator through the fluid channel can oscillate, which is conducive to realizing pulsations with different amplitudes and oscillation forms.

[0022] Therefore, during the rotation process of the rotor unit, by adjusting the output speed of the driving mechanism, pulsations of different frequencies of the fluid can be realized. And by adjusting the shape of the rotating part of the rotor unit in the fluid channel, pulsations not limited to the sine form can be obtained, such as fluid pulsations in different oscillation forms such as triangular wave form or square wave form. By adjusting the deflection distance between the center of the rotation axis of the rotor unit and the fluid channel, or by adjusting the occupied area of the fluid channel by the flow amplitude modulation unit, pulsations of different amplitudes of the fluid flow can be realized. Generally speaking, the flow pulsation generator provided by the present invention can have the ability to adjust the oscillation form and pulsation amplitude of the fluid flow pulsation based on the above structural design. Compared with using a wheel disc for fluid flow regulation, the space occupation is smaller and the flow output is more flexible.

[0023] Other features and advantages of the flow pulsation generator provided by the present invention will be further described in the following specific embodiments. Brief Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 FIG. is a schematic cross-sectional view of the flow pulsation generator provided by the embodiment of the present invention along the axial direction of the fluid channel;

[0026] Figure 2 FIG. is a partial schematic cross-sectional view of the flow pulsation generator provided by the embodiment of the present invention along the axial direction of the fluid channel;

[0027] Figure 3 Schematic cross-sectional view of the flow pulsation generator along the axial direction of the first mounting through-hole according to an embodiment of the present invention;

[0028] Figure 4 Top view of the overall structure of the flow pulsation generator according to an embodiment of the present invention.

[0029] The reference numerals are as follows:

[0030] 10. Generator main body;

[0031] T. Fluid passage; A. First mounting through-hole; B. Second mounting through-hole; D. Radial direction;

[0032] 20. Rotor unit;

[0033] 21. Rotating shaft; 22. Runner; 23. Connecting member; E. Adjusting surface;

[0034] 30. Flow amplitude modulation unit;

[0035] 31. Amplitude modulation slider; 311. Threaded hole; 32. Amplitude adjustment block; 321. Connecting portion; 322. Screw portion; 3221. Connecting section; 3222. Limiting section; 33. Stroke control member; T1. Flow adjustment area;

[0036] 40. Driving mechanism; 41. Mounting housing; 42. Magnetic coupling connector; 421. Magnetic coupling outer rotor; 422. Magnetic coupling inner rotor; 43. Driving assembly; 431. Mounting bracket; 432. Driving motor;

[0037] 50. Bearing;

[0038] 60. Mounting base;

[0039] 70. End cover;

[0040] 80. Pipe joint;

[0041] S1. First seal; S2. Second seal; S3. Third seal. Detailed implementation manners

[0042] In the description of the present invention, it should be understood that when terms such as "center", "inner", "outer", "axial direction", "radial direction", "circumferential direction", etc. are used to indicate the orientation or positional relationship, without special explanation, it is understood as the orientation or positional relationship based on the orientation shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In addition, features limited by "first" and "second" for descriptive purposes only should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Features limited by "first" and "second" may explicitly or implicitly include at least one of the limited features. When the description "a plurality" appears, it generally means at least two, such as two, three, etc., unless otherwise specifically limited.

[0044] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "joined", and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection, it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of this specification, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] It should be noted that the flow pulsation generator provided by the embodiment of the present invention is mainly applied to the dynamic characteristic experiment of the nozzle injection of a liquid rocket engine to simulate the flow pulsation of the nozzle of a liquid rocket engine. Among them, the fluid in the fluid passage T of the flow pulsation generator is a liquid. Due to its incompressibility (under normal conditions), the generation and transmission modes of its flow pulsation are different from those of gases. When simulating the flow pulsation of the nozzle of a liquid rocket engine, the liquid flows through the fluid passage T, and the fluid passage T is a variable cross-section passage under the cooperation of the rotor unit 20 and the flow amplitude modulation unit 30, enabling the flow pulsation generator to generate flow change characteristics such as flow pulsation frequency, amplitude, and waveform similar to those of a real nozzle.

[0047] As described above, the general inventive concept of the embodiments of the present invention is to provide a flow pulsation generator. Through the structural design of the flow pulsation generator, the flow pulsation generator mainly consists of components such as a generator main body 10, a rotor unit 20, a flow amplitude modulation unit 30, and a driving mechanism 40. The generator main body 10 serves as the main structure for generating fluid pulsations, forming a fluid channel T. On both sides along the radial direction D of the fluid channel T, a first mounting through-hole A and a second mounting through-hole B are respectively formed. The first mounting through-hole A and the second mounting through-hole B are both communicated with the fluid channel T and have a partially overlapping area to respectively mount the rotor unit 20 and the flow amplitude modulation unit 30. The flow amplitude modulation unit 30 and the rotor unit 20 jointly enclose a flow regulation area T1. When the fluid passes through the fluid channel T, it passes through the flow regulation area T1. The flow amplitude modulation unit 30 can perform translational movement closer to or away from the rotor unit 20 to adjust the opening degree of the flow regulation area T1, so as to cause the cross-sectional area of the flow regulation area T1 to change, thereby obtaining fluid pulsations with different amplitudes. At the same time, under the drive of the driving mechanism 40, the rotor unit 20 can rotate in the first mounting through-hole A and cause the cross-sectional area of the flow channel of the flow regulation area T1 to change during the rotation process, so as to obtain fluid pulsations with different oscillation forms.

[0048] Based on the above general inventive concept, please refer to Figures 1 to 4 As shown, the embodiments of the present invention provide a flow pulsation generator, including: a generator main body 10, which forms a fluid channel T, a first mounting through-hole A, and a second mounting through-hole B. The first mounting through-hole A and the second mounting through-hole B are respectively located on both sides of the fluid channel T in the radial direction D of the fluid channel T and are communicated with the fluid channel T; a rotor unit 20, which is arranged in the first mounting through-hole A and is rotationally connected to the generator main body 10; a flow amplitude modulation unit 30, which is arranged in the second mounting through-hole B and encloses a flow regulation area T1 with the rotor unit 20, and the flow amplitude modulation unit 30 is arranged to be able to move closer to or away from the rotor unit 20 in the radial direction D to adjust the opening degree of the flow regulation area T1; and a driving mechanism 40, which is connected to the rotor unit 20 and drives the rotor unit 20 to rotate, so that different parts of the rotor unit 20 enclose the flow regulation area T1 with the flow amplitude modulation unit 30 to adjust the cross-sectional area of the flow channel of the flow regulation area T1.

[0049] It can be understood that the fluid passage T formed in the generator main body 10 of this embodiment can allow fluid to pass through. The first mounting through hole A and the second mounting through hole B formed in the generator main body 10 are arranged offset from the axis of the fluid passage T. The first mounting through hole A and the second mounting through hole B are distributed facing each other on both sides of the central axis of the fluid passage T (i.e., on the radial direction D of the fluid passage T), and are both communicated with the fluid passage T. A rotor unit 20 capable of rotating under the drive of a drive mechanism 40 is installed in the first mounting through hole A, and a flow amplitude modulation unit 30 capable of approaching or moving away from the rotor unit 20 in the direction of the rotor unit 20 is installed in the second mounting through hole B. The rotor unit 20 and the flow amplitude modulation unit 30 can enclose a flow regulation area T1 in the fluid passage T. By moving the flow amplitude modulation unit 30 closer to or away from the rotor unit 20, the overall cross-sectional area of the flow regulation area T1 is increased or decreased, so as to adjust the opening degree of the flow regulation area T1 and achieve the adjustment of the maximum amplitude of fluid pulsation. Moreover, during the rotation of the rotor unit 20, the surface of the rotor unit 20 on the side opposite to the flow amplitude modulation unit 30 changes continuously due to rotation, so that different parts of the rotor unit 20 and the flow amplitude modulation unit 30 enclose the flow regulation area T1, and the cross-sectional area of the flow passage of the flow regulation area T1 changes continuously due to the rotation of the rotor unit 20, thereby realizing pulsation of different oscillation forms.

[0050] Therefore, the first mounting through hole A and the second mounting through hole B formed in the generator main body 10 are arranged offset from the axis of the fluid passage T, which is more conducive to obtaining a flow regulation area T1 with a larger area; by changing the shape of the part of the flow regulation area T1 blocked during the rotation of the rotor unit 20, fluid pulsations in the form of a sine wave, a triangular wave, or various other forms can be obtained; and by adjusting the output rotation speed of the drive mechanism 40, the fluid can exhibit different pulsation frequencies; since the first mounting through hole A and the second mounting through hole B are respectively located on both sides of the fluid passage T in the radial direction of the fluid passage T and are communicated with the fluid passage T, by adjusting the occupancy rate of the flow amplitude modulation unit 30 in the fluid passage T, different maximum amplitudes of fluid pulsation can be obtained; and by adjusting the deviation distance of the center of the rotation axis of the rotor unit 20 from the axis of the fluid passage T, the amplitude adjustment of the flow pulsation can be further realized.

[0051] The flow pulsation generator provided in this embodiment has a compact structure, and most components are integrated in the generator main body 10, which has an advantage in space occupancy compared with the disk-type flow pulsation generator.

[0052] It should be noted that the flow regulation area T1 formed by the rotor unit 20 and the flow amplitude modulation unit 30 in the embodiments of the present application is located within the fluid passage T. The flow amplitude modulation unit 30 can control the opening degree of the flow regulation area T1. That is, when the flow amplitude modulation unit 30 moves away from the rotor unit 20, the cross-sectional area of the flow passage of the flow regulation area T1 increases; when the flow amplitude modulation unit 30 moves closer to the rotor unit 20, the cross-sectional area of the flow passage of the flow regulation area T1 decreases, so as to obtain different maximum amplitudes of fluid pulsation. During the rotation of the rotor unit 20, the surfaces of different parts rotate within the fluid passage T, thereby causing the cross-sectional area of the flow passage of the flow regulation area T1 to change. By designing different shapes for the rotating part of the rotor unit 20 within the fluid passage T, pulsations of different oscillation forms can be obtained.

[0053] In the embodiments of the present invention, referring to Figure 1 , the first mounting through-hole A can be a through-hole with a circular cross-section to adapt to the rotation of the rotor unit 20. A part of the cross-section of the first mounting through-hole A coincides with the cross-section of the fluid passage T. During the rotation of the rotor unit 20, a part of it passes through the fluid passage T, so that the cross-sectional area of the flow passage of the flow regulation area T1 changes continuously. The second mounting through-hole B is adapted to the flow amplitude modulation unit B. When the cross-section of the flow amplitude modulation unit B in the second mounting through-hole B is rectangular, the second mounting through-hole B can be a through-hole with a rectangular cross-section. When the cross-section of the flow amplitude modulation unit B in the second mounting through-hole B is of other shapes, the second mounting through-hole B can also be designed accordingly to ensure that the flow amplitude modulation unit B can move closer to or away from the rotor unit 20.

[0054] In some specific embodiments, the fluid passage T extends along its axial direction. The first mounting through-hole A is located on the radial direction D of the fluid passage T and at the bottom of the fluid passage T, while the second mounting through-hole B is located on the radial direction D of the fluid passage T and at the top of the fluid passage T. The first mounting through-hole A and the second mounting through-hole B deviate from the central axis of the fluid passage T and are designed to be relatively parallel, so as to facilitate the flow regulation area T1 to have a larger area, thereby enabling a wider adjustable range for the amplitude and oscillation form of fluid pulsation.

[0055] To make the fluid pulsation change periodically, referring to Figure 2 , in some embodiments, the rotor unit 20 has a plurality of regulating surfaces E with the same structure connected in sequence along its circumferential direction. The driving mechanism 40 drives the rotor unit 20 to rotate, so that the plurality of regulating surfaces E can successively enclose the flow regulation area T1 with the flow amplitude modulation unit 30 to periodically regulate the cross-sectional area of the flow passage of the flow regulation area T1.

[0056] The rotor unit 20 has a plurality of adjusting surfaces E with the same structure connected in sequence along its circumferential direction. By designing the number of the adjusting surfaces E and the angle between two adjacent adjusting surfaces E, the plurality of adjusting surfaces E can form a non-circular cross-sectional shape. During the rotational movement of the rotor unit 20 driven by the driving mechanism 40, the plurality of adjusting surfaces E can successively enclose a flow rate adjustment area T1 with the flow rate amplitude modulation unit 30, prompting the flow rate adjustment area T1 to change periodically as the rotor unit 20 rotates, so as to prompt the fluid pulsation to have a periodic oscillation form, which is beneficial to the simulation of the dynamic characteristics of the liquid rocket engine nozzle injection.

[0057] It should be understood that the plurality of adjusting surfaces E in this embodiment can be 3, 4, 5, 6 (as Figure 1 shown) or more than 6. The angle between two adjacent adjusting surfaces E can be uniformly designed. For example, when the number of the adjusting surfaces E is 4, the angle between two adjacent adjusting surfaces E can be 90°. The cross-sectional shape formed by the 4 adjusting surfaces E is a square. When the rotor unit 20 rotates one week, the fluid pulsation shows a sinusoidal periodic oscillation; the angle between two adjacent adjusting surfaces E can be non-uniformly designed. For example, when the number of the adjusting surfaces E is 4, the angles between two adjacent adjusting surfaces E can be 120° and 60° respectively. The cross-sectional shape formed by the 4 adjusting surfaces E can be a parallelogram. In this non-uniform angle design, due to the different angles, the pulsations generated when the fluid flows between each adjusting surface E will have different phases and amplitudes, prompting the periodic oscillation form of the fluid to be more diversified. By adjusting the number and angle of the adjusting surfaces E, the precise control of the fluid pulsation characteristics can be realized, and more diversified oscillation forms can be obtained, rather than being limited to a single sinusoidal regular oscillation.

[0058] In some embodiments, the rotor unit 20 includes a rotating shaft 21. The rotating shaft 21 passes through the first mounting through hole A and is rotatably connected to the generator main body 10, and the rotating shaft 21 has a plurality of adjusting surfaces E with the same structure connected in sequence along its circumferential direction.

[0059] The plurality of adjusting surfaces E in this embodiment are integrally formed on the surface of the rotating shaft 21. The rotating shaft 21 passes through the first mounting through hole A and is rotatably connected to the generator main body 10, which is beneficial to simplifying the structural design of the flow rate pulsation generator, reducing the number of parts, and reducing the maintenance cost.

[0060] In some embodiments, referring to Figure 2 , the rotor unit 20 includes a rotating shaft 21, a runner 22 and a connecting member 23. The rotating shaft 21 passes through the first mounting through hole A and is rotatably connected to the generator main body 10. The runner 22 is sleeved on the rotating shaft 21 and connected to the rotating shaft 21 through the connecting member 23, and the runner 22 has a plurality of adjusting surfaces E connected in sequence along its circumferential direction.

[0061] In this embodiment, the rotor unit 20 includes a rotating shaft 21, a runner 22, and a connecting member 23. A plurality of adjusting surfaces E are formed in the circumferential direction of the runner 22. The runner 22, the rotating shaft 21, and the connecting member 23 are designed in a split type. The rotating shaft 21 passes through the first mounting through hole A and is rotatably connected to the generator main body 10 to receive the driving force provided by the driving mechanism 40. The runner 22 is sleeved on the rotating shaft 21 and is connected to the rotating shaft 21 through the connecting member 23. Through the structural design of the rotor unit 20, the plurality of adjusting surfaces E are designed on the runner 22 that can be detached from the rotating shaft 21. When facing different simulation requirements, only the runner 22 needs to be replaced, and there is no need to replace the rotating shaft 21, so as to meet the simulation requirements of different oscillation forms of fluid pulsation, making the flow pulsation generator more flexible.

[0062] Reference Figure 2 , in a specific embodiment, a clamping groove is designed on the outer edge of the rotating shaft 21. The connecting member 23 is fitted into the clamping groove and partially protrudes from the clamping groove. The runner 22 is designed with a mating groove adapted to the connecting member 23. The runner 22 is sleeved on the surface of the rotating shaft 21, and one end of the connecting member 23 away from the rotating shaft 21 is clamped in the mating groove of the runner 22, so as to realize the tight connection between the runner 22 and the rotating shaft 21, and avoid the runner 22 from shifting during rotation, affecting the simulation effect of fluid pulsation.

[0063] To ensure the rotation of the rotating shaft 21 in the generator main body 10, in some embodiments, both axial ends of the rotating shaft 21 are rotatably connected to the generator main body 10 through bearings 50. That is to say, two bearings 50 are designed at intervals along the axial direction of the rotating shaft 21 in the embodiments of the present invention. Both axial ends of the rotating shaft 21 are respectively inserted into the two bearings 50 to perform rotational motion under the drive of the driving mechanism 40, and will not affect the generator main body 10 during the rotational motion.

[0064] In some embodiments, the plurality of adjusting surfaces E are sequentially connected and enclose a regular polygon structure or an enclosed serrated structure. For example, the plurality of adjusting surfaces E sequentially connected and enclosing a regular polygon structure can be a regular hexagon, so as to make the fluid pulsation more periodic. During the single-cycle motion of the rotor unit 20, the fluid pulsation oscillation spectrum can change periodically. Compared with the structure of an irregular shape, the plurality of adjusting surfaces E sequentially connected and enclosing a regular polygon structure or an enclosed serrated structure are more conducive to increasing the oscillation frequency of the fluid pulsation under the same driving power, making the flow pulsation generator have a higher simulation efficiency.

[0065] When the fluid flows through the regular polygon part, since the shape of the runner 22 in the fluid channel T changes, the cross-sectional area of the fluid changes accordingly, so that the fluid changes periodically. At the same time, when the rotating shaft 21 rotates one week, the cross-sectional area will change periodically multiple times, so as to achieve a high-frequency pulsation effect.

[0066] Reference Figure 1 and Figure 2 To adjust the opening degree of the flow rate adjustment area T1, in some embodiments, the flow rate amplitude adjustment unit 30 includes: an amplitude adjustment slider 31 disposed in the second installation through hole B and provided with a threaded hole 311; and an amplitude adjustment block 32 including a connection portion 321 and a screw portion 322. The connection portion 321 is located outside the second installation through hole B and connected to the generator main body 10. The screw portion 322 is located in the second installation through hole B and is threadedly connected to the amplitude adjustment slider 31 through the threaded hole 311. Wherein, by adjusting the depth of the screw portion 322 screwed into the threaded hole 311, the amplitude adjustment slider 31 moves along the radial direction D in the second installation through hole B.

[0067] In this embodiment, the amplitude adjustment slider 31 is disposed in the second installation through hole B. A threaded hole 311 is provided on the surface of the amplitude adjustment slider 31 away from the fluid passage T. The connection portion 321 of the amplitude adjustment block 32 is located outside the second installation through hole B in the direction away from the fluid passage T of the second installation through hole B and is connected to the outer surface of the generator main body 10, thereby realizing the sealing of the second installation through hole B. The screw portion 322 of the amplitude adjustment block 32 is located in the second installation through hole B and is threadedly connected to the amplitude adjustment slider 31 through the threaded hole 311. By adjusting the depth of the screw portion 322 screwed into the threaded hole 311, the amplitude adjustment slider 31 can move closer to or away from the rotor unit 20 (i.e., move along the radial direction D), so that the opening degree of the flow rate adjustment area T1 is adjusted, so that the fluid pulsation has different amplitudes.

[0068] It should be understood that the connection portion 321 and the screw portion 322 in this embodiment can be integrally formed or can adopt a split design. When the connection portion 321 and the screw portion 322 are integrally formed, the opening degree of the flow rate adjustment area T1 is pre-calibrated, and the position of the screw portion 322 is relatively fixed after being screwed into the threaded hole 311. This design form is applicable to a simulation environment where the opening degree of the flow rate adjustment area T1 does not need to be frequently adjusted, which is beneficial to saving the number of parts and simplifying the structure of the flow pulsation generator.

[0069] When the connection portion 321 and the screw portion 322 adopt a split design, the connection portion 321 is provided with an installation hole facing the second installation through hole B. The screw portion 322 can be a bolt. The screw portion 322 is inserted into the installation hole and can rotate in the installation hole. One end of the screw portion 322 away from the installation hole is threadedly connected to the threaded hole 311. During the operation of the flow pulsation generator, when the opening degree of the flow rate adjustment area T1 is required, only the end of the screw portion 322 away from the threaded hole 311 needs to be rotated and adjusted by using an adjustment tool, and the flow pulsation generator does not need to be disassembled, so that the opening degree of the flow rate adjustment area T1 can be adjusted, making the flow pulsation generator more flexible.

[0070] Reference Figure 1 andFigure 2 In order to avoid interference of the amplitude modulation slider 31 with the rotation of the rotor unit 20, in some embodiments, the flow rate amplitude modulation unit 30 further includes a stroke control member 33, and the stroke control member 33 is fixedly arranged in the threaded hole 311; the screw rod portion 322 includes a connecting section 3221 and a limiting section 3222 protruding from the connecting section 3221 along the circumference of the connecting section 3221. The connecting section 3221 passes through the stroke control member 33, and the limiting section 3222 is located on the side of the stroke control member 33 away from the connecting portion 321 and is threadedly connected to the threaded hole 311, and the limiting section 3222 can be in mutual abutment with the stroke control member 33 to limit the movement stroke of the amplitude modulation slider 31 in the radial direction D.

[0071] It can be understood that the screw rod portion 322 in this embodiment includes a connecting section 3221 and a limiting section 3222 protruding from the connecting section 3221 along the circumference of the connecting section 3221, and the diameter of the connecting section 3221 is smaller than that of the limiting section 3222; the stroke control member 33 is an annular member, and the stroke control member 33 is fixedly arranged in the threaded hole 311. The connecting section 3221 passes through the stroke control member 33, and the limiting section 3222 is located on the side of the stroke control member 33 away from the connecting portion 321 and is threadedly connected to the threaded hole 311. The bottom of the stroke control member 33 can be in mutual abutment with the end face of the top of the limiting section 3222 protruding from the connecting section 3221, so that the maximum stroke of the amplitude modulation slider 31 in the direction towards the rotor unit 20 is limited. After the amplitude modulation slider 31 is adjusted by the screw rod portion 322, it can move towards the rotor unit 20 at most only to be tangent to the rotation circumference of the rotor unit, so as to avoid interference with the rotation of the rotor unit 20 and cause damage to components.

[0072] Reference Figure 3 and Figure 4 In order to realize the rotation of the rotor unit 20, in some embodiments, the drive mechanism 40 includes: a mounting housing 41, which is located at one end of the generator main body 10 in the axial direction of the first mounting through hole A and is hermetically connected to the generator main body 10; a magnetic coupling connector 42, which is mounted on the mounting housing 41 and is connected to the rotor unit 20; and a drive assembly 43, which is connected to the magnetic coupling connector 42 to drive the rotor unit 20 to rotate through the magnetic coupling connector 42.

[0073] In this embodiment, the installation housing 41 is located at one end of the generator body 10 in the axial direction of the first installation through-hole A and is hermetically connected to the generator body 10. The magnetic coupling connector 42 is installed on the installation housing 41 and is key-connected to the rotor unit 20. The driving assembly 43 is arranged at one end away from the generator body 10 in the axial direction of the first installation through-hole A and is connected to the magnetic coupling connector 42. During the operation of the flow pulsation generator, the driving assembly 43 generates a driving force to drive the magnetic coupling connector 42 to rotate, and the magnetic coupling connector 42 further drives the rotor unit 20 to rotate, thereby realizing the rotation of at least a part of the rotor unit 20 in the fluid passage T, so that the cross-sectional area of the flow passage in the flow regulation area T1 changes in real time.

[0074] Further, referring to Figure 3 , the magnetic coupling connector 42 in the embodiment of the present invention includes: a magnetic coupling outer rotor 421, which is arranged outside the installation housing 41 and is connected to the driving assembly 43; and a magnetic coupling inner rotor 422, which is arranged inside the installation housing 41 and is connected to the rotor unit 20, and the magnetic coupling inner rotor 422 rotates under the magnetic force of the magnetic coupling outer rotor 421 to drive the rotor unit 20 to rotate.

[0075] In this embodiment, the magnetic coupling outer rotor 421 is sleeved outside the installation housing 41 and is connected to the driving assembly 43, and can rotate on the installation housing 41 under the drive of the driving assembly 43; the magnetic coupling inner rotor 422 is arranged inside the installation housing 41. The magnetic coupling inner rotor 422 is axially provided with a connection hole along the first installation through-hole B. One end of the rotor unit 20 is arranged in the connection hole and is key-connected to the magnetic coupling inner rotor 422. The magnetic coupling inner rotor 422 rotates under the magnetic force of the magnetic coupling outer rotor 421, thereby driving the rotor unit 20 to rotate, so that the cross-sectional area of the flow passage in the flow regulation area T1 changes in real time.

[0076] The magnetic coupling connector 42 designed in this embodiment enables the system to still achieve the transmission effect from the driving assembly 43 to the rotor unit 20 under low-temperature conditions and high speeds. It realizes the non-contact transmission of the magnetic coupling inner rotor 422, avoids direct contact and wear in traditional mechanical transmission, thereby extending the service life of the flow pulsation generator; moreover, the non-contact transmission design can ensure the sealed connection between the installation housing 41 and the generator body 10 to improve the sealing performance of the entire system, prevent fluid leakage, and improve the safety and reliability of the flow pulsation generator; by controlling the driving force and rotation speed of the driving assembly 43, the rotation speed and direction of the rotor unit 20 can be flexibly adjusted, thereby realizing the precise control of the fluid flow rate.

[0077] It should be noted that the magnetic coupling outer rotor 421 and the magnetic coupling inner rotor 422 in this embodiment are blocked by the installation housing 41. To avoid affecting the magnetic force generated by the magnetic coupling outer rotor 421, the installation housing 41 should have as thin a wall thickness as possible while ensuring the structural strength, and a material with low magnetic resistance and conductivity can be used as the material of the installation housing, thereby alleviating the attenuation of the magnetic force when passing through the substance, improving the magnetic coupling efficiency, and ensuring the reliable rotation of the rotor unit 20 and the accuracy of flow regulation in the flow pulsation generator.

[0078] To improve the stability of the flow pulsation generator, in some embodiments, referring to Figure 3 , the flow pulsation generator further includes: a mounting base 60 for mounting the generator main body 10; an end cover 70 axially disposed at one end of the generator main body 10 away from the magnetic coupling connector 42 along the first mounting through hole A and sealingly connected to the generator main body 10; and two pipe connectors 80 axially disposed at both ends of the fluid passage T along the axial direction of the fluid passage T and connected to the generator main body 10.

[0079] The mounting base 60 is disposed at the bottom of the generator main body 10, and the generator main body 10 is fixed on the mounting base 60. The mounting base 60 provides a stable support foundation for the generator main body 10; the end cover 70 is axially disposed at one end of the generator main body 10 away from the magnetic coupling connector 42 along the first mounting through hole A and sealingly connected to the generator main body 10 to cooperate with the installation housing 41 to achieve the overall sealing of the first mounting through hole A; the two pipe connectors 80 are axially disposed at both ends of the fluid passage T along the axial direction of the fluid passage T and connected to the generator main body 10 for the supply and output of the fluid.

[0080] Since fluid pulsation usually operates under relatively high fluid pressure conditions, to improve the fluid tightness of the flow pulsation generator, referring to Figure 3 , the flow pulsation generator in the embodiment of the present invention further includes: a first seal S1 for sealingly connecting the amplitude adjustment block 32 and the generator main body 10 between the amplitude adjustment block 32 and the generator main body 10; a second seal S2 for sealingly connecting the installation housing 41 and the generator main body 10 between the installation housing 41 and the generator main body 10; and a third seal S3 for sealingly connecting the end cover 70 and the generator main body 10 between the end cover 70 and the generator main body 10.

[0081] In this embodiment, the first seal S1, the second seal S2, and the third seal S3 can all be sealing washers. The first seal S1 is disposed between the amplitude adjustment block 32 and the generator main body 10. Specifically, an installation groove can be formed on the generator main body 10, and the first seal S1 is disposed in the installation groove formed on the generator main body 10 and abuts against the amplitude adjustment block 32 to seal one end of the second installation through hole B away from the rotor unit 20. The second seal S2 is disposed between the installation housing 41 and the generator main body 10. Specifically, an installation groove can be formed on the installation housing 41, and the second seal S2 is disposed in the installation groove formed on the installation housing 41 and abuts against the generator main body 10 to seal one end of the second installation through hole B away from the rotor unit 20, thereby hermetically connecting the installation housing 41 and the generator main body 10. The third seal S3 is disposed between the end cover 70 and the generator main body 10. Specifically, an installation groove can be formed on the end cover 70, and the third seal S3 is disposed in the installation groove formed on the end cover 70 and abuts against the generator main body 10 to hermetically connect the end cover 70 and the generator main body 10. All three seals are static seals, effectively achieving the hermetic isolation of the first installation through hole A and the second installation through hole B from the external environment, which is beneficial for the operation of fluid pulsation under higher fluid pressure conditions.

[0082] In some embodiments, referring to Figure 3 and Figure 4 , the drive assembly 43 includes: a mounting bracket 431 connected to the mounting base 60; and a drive motor 432 disposed on the mounting bracket 431.

[0083] In this embodiment, the mounting bracket 431 is connected to the mounting base 60, and the drive motor 432 is fixedly mounted on the mounting bracket 431 to provide the stability of the drive motor 432. The output shaft of the drive motor 432 is key-connected to the magnetic coupling outer rotor 421 to provide the driving force required for the rotation of the magnetic coupling outer rotor 421.

[0084] In some embodiments, the fluid in the fluid passage T of the flow pulsation generator is a liquid, which is used to simulate the flow pulsation of the nozzle of a liquid rocket engine, and further to meet the simulation requirements under different operating conditions of the nozzle of the liquid rocket engine.

[0085] In summary, the flow pulsation generator provided by the embodiments of the present invention can diversify the oscillation forms of fluid pulsation, can achieve the adjustment of fluid pulsation with different amplitudes, and is more flexible and has a smaller space occupancy rate compared with the disk type for fluid flow adjustment.

[0086] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A flow pulsation generator, characterized in that: include: A generator body (10) is formed with a fluid channel (T), a first mounting through hole (A) and a second mounting through hole (B), wherein the first mounting through hole (A) and the second mounting through hole (B) are respectively located on both sides of the fluid channel (T) in a radial direction (D) of the fluid channel (T) and are in communication with the fluid channel (T); A rotor unit (20), arranged in the first mounting through hole (A) and rotatably connected to the generator body (10); a flow amplitude modulation unit (30) disposed in the second mounting through hole (B) and enclosing a flow adjustment area (T1) with the rotor unit (20), and the flow amplitude modulation unit (30) being configured to be able to move closer to or farther from the rotor unit (20) in the radial direction (D) so as to adjust the opening size of the flow adjustment area (T1); as well as a driving mechanism (40) connected to the rotor unit (20) and driving the rotor unit (20) to rotate, so that different parts of the rotor unit (20) and the flow amplitude modulation unit (30) enclose the flow adjustment area (T1), so as to adjust the flow channel cross-sectional area of ​​the flow adjustment area (T1); The rotor unit (20) has a plurality of adjustment surfaces (E) having the same structure and connected in sequence along its circumference; The driving mechanism (40) drives the rotor unit (20) to rotate, so that the plurality of adjustment surfaces (E) can sequentially enclose the flow adjustment area (T1) with the flow amplitude modulation unit (30), so as to periodically adjust the flow channel cross-sectional area of ​​the flow adjustment area (T1); The rotor unit (20) comprises a rotating shaft (21), the rotating shaft (21) is inserted into the first mounting through hole (A) and is rotatably connected to the generator body (10), and the rotating shaft (21) has a plurality of adjustment surfaces (E) of the same structure that are sequentially connected along its circumference; or, the rotor unit (20) comprises a rotating shaft (21), a rotating wheel (22) and a connecting member (23), the rotating shaft (21) is inserted into the first mounting through hole (A) and is rotatably connected to the generator body (10), the rotating wheel (22) is sleeved on the rotating shaft (21) and is connected to the rotating shaft (21) via the connecting member (23), and the rotating wheel (22) has a plurality of adjustment surfaces (E) that are sequentially connected along its circumference; The flow amplitude modulation unit (30) comprises: an amplitude modulation slider (31), which is arranged in the second mounting through hole (B) and is provided with a threaded hole (311); and an amplitude adjustment block (32), comprising a connection portion (321) and a screw portion (322), wherein the connection portion (321) is located outside the second mounting through hole (B) and is connected to the generator body (10), and the screw portion (322) is located inside the second mounting through hole (B) and is threadedly connected to the amplitude modulation slider (31) through the threaded hole (311); The depth of the screw rod portion (322) screwed into the threaded hole (311) is adjusted so that the amplitude modulation slider (31) moves along the radial direction (D) in the second mounting through hole (B).

2. The flow pulsation generator according to claim 1, characterized in that: The plurality of adjustment surfaces (E) are connected in sequence to form a regular polygonal structure or a sawtooth structure.

3. The flow pulsation generator according to claim 1, characterized in that: The flow amplitude modulation unit (30) further comprises a stroke control member (33), wherein the stroke control member (33) is fixedly disposed in the threaded hole (311); The screw rod portion (322) comprises a connecting section (3221) and a limiting section (3222) protruding from the connecting section (3221) along the circumference of the connecting section (3221); the connecting section (3221) is penetrated through the stroke control member (33); the limiting section (3222) is located on a side of the stroke control member (33) away from the connecting section (321) and is threadedly connected to the threaded hole (311); and the limiting section (3222) can abut against the stroke control member (33) to limit the movement stroke of the amplitude modulation slider (31) along the radial direction (D).

4. The flow pulsation generator according to claim 1, characterized in that: The driving mechanism (40) comprises: A mounting housing (41) located at one end of the generator body (10) in the axial direction of the first mounting through hole (A) and sealedly connected to the generator body (10); A magnetic coupling connector (42) mounted on the mounting housing (41) and connected to the rotor unit (20); and A driving assembly (43) is connected to the magnetic coupling connector (42) so as to drive the rotor unit (20) to rotate via the magnetic coupling connector (42).

5. The flow pulsation generator according to claim 4, characterized in that: The magnetic coupling connector (42) comprises: A magnetically coupled outer rotor (421), disposed outside the mounting housing (41) and connected to the drive assembly (43); and A magnetically coupled inner rotor (422) is arranged inside the mounting housing (41) and connected to the rotor unit (20), and the magnetically coupled inner rotor (422) rotates under the magnetic force of the magnetically coupled outer rotor (421) to drive the rotor unit (20) to rotate.

6. The flow pulsation generator according to claim 4, characterized in that: Also includes: A mounting base (60) for mounting the generator body (10); an end cover (70) disposed along the axial direction of the first mounting through hole (A) at an end of the generator body (10) away from the magnetic coupling connector (42) and sealedly connected to the generator body (10); and Two pipe joints (80) are respectively arranged at two ends of the fluid channel (T) along the axial direction of the fluid channel (T) and connected to the generator body (10).

7. The flow pulsation generator according to any one of claims 1 to 6, characterized in that: The fluid in the fluid channel (T) of the flow pulsation generator is liquid, so as to simulate the flow pulsation of the nozzle of a liquid rocket engine.

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