Flow pulsation generator

Abstract

The invention relates to the technical field of experimental research on dynamic injection characteristics of liquid rocket engine nozzles, in particular to a flow pulsation generator. The flow pulsation generator mainly comprises a generator body, a rotor unit, a flow amplitude modulation unit and a driving mechanism, and the rotor unit is located in a first mounting through hole of the generator body and rotationally connected with the generator body; the flow amplitude modulation unit is located in the second mounting through hole of the generator main body, a flow regulation area is defined by the flow amplitude modulation unit and the rotor unit, and the flow amplitude modulation unit can move close to or away from the rotor unit in the radial direction; the driving mechanism is connected with the rotor unit and drives the rotor unit to rotate, so that different parts of the rotor unit and the flow amplitude modulation unit define a flow adjusting area, and the sectional area of the flow adjusting area is adjusted. The flow pulsation generator provided by the invention is diversified in oscillation form, can realize pulsation adjustment of different amplitudes, is compact in structure, and has a smaller space occupancy rate.

Description

Technical Field

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

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

[0003] At present, the common flow pulsation generator is to drive the wheel on the rotating shaft to rotate by a motor, so that the through hole on the wheel and the liquid flow channel in the sleeve are connected or closed according to a certain period, thereby controlling the opening and closing of the liquid flow channel to make the liquid flow oscillate in an approximately sinusoidal law. However, this flow pulsation generator has the following problems: (1) Based on this periodic connection or closing method, this flow pulsation generator can only oscillate in an approximately sinusoidal law, the oscillation form is single and the oscillation form will not change with the change of the shape of the rotating shaft and the wheel; (2) This flow pulsation generator itself does not have the ability to adjust the pulsation amplitude, and can only obtain pulsations of different amplitudes by adjusting the valve opening before entering the flow pulsation generator; (3) Due to the existence of the wheel, this flow pulsation generator will cause the overall volume of the pulsation generator to be large and cannot be used in a small space.

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

[0005] The invention provides a flow pulsation generator to solve the technical problems of the existing flow pulsation generator having a single oscillation form, being unable to realize pulsations of different amplitudes and occupying a large space.

[0006] The present invention provides a flow pulsation generator, comprising: a generator body, formed with a fluid channel, a first mounting through hole and a second mounting through hole, the first mounting through hole and the second mounting through hole are respectively located on both sides of the fluid channel in the radial direction of the fluid channel and are connected to the fluid channel; a rotor unit, arranged in the first mounting through hole and rotatably connected to the generator body; a flow amplitude modulation unit, arranged in the second mounting through hole and forming 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 size 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 and the flow amplitude modulation unit form a flow regulation area to adjust the flow channel cross-sectional area of ​​the flow regulation area.

[0007] In some embodiments, the rotor unit has multiple adjustment surfaces with the same structure connected in sequence along its circumference; the driving mechanism drives the rotor unit to rotate so that the multiple adjustment surfaces can form a flow adjustment area in sequence with the flow amplitude modulation unit to periodically adjust the flow channel cross-sectional area of ​​the flow adjustment area.

[0008] In some embodiments, the rotor unit includes a rotating shaft, which is passed through the first mounting through hole and rotatably connected to the generator body, and the rotating shaft has a plurality of adjustment surfaces of the same structure connected in sequence along its circumference; or the rotor unit includes a rotating shaft, a rotating wheel and a connecting piece, the rotating shaft is passed through the first mounting through hole and rotatably connected to the generator body, the rotating wheel is sleeved on the rotating shaft and connected to the rotating shaft through the connecting piece, and the rotating wheel has a plurality of adjustment surfaces connected in sequence along its circumference.

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

[0010] In some embodiments, the plurality of adjustment surfaces are sequentially connected to form a regular polygonal structure or a sawtooth structure.

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

[0012] In some embodiments, the flow amplitude modulation unit also includes a stroke control member, which is 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 is passed 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 shell, located at one end of the generator body in the axial direction of the first mounting through hole and sealedly connected to the generator body; a magnetic coupling connector, mounted on the mounting shell 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, which is arranged on the outside of the mounting shell and connected to the drive assembly; and a magnetic coupling inner rotor, which is arranged on the inside of the mounting shell 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 also includes: a mounting base, on which the generator body is mounted; an end cover, which is axially arranged at one end of the generator body away from the magnetic coupling connector along the first mounting through hole and is sealed and connected to the generator body; and two pipe joints, which are respectively arranged at both ends of the fluid channel along the axial direction of the fluid channel and connected to the generator body.

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

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

[0018] In some implementations, the fluid in the fluid channel of the flow pulsation generator is liquid, so as to simulate the flow pulsation of a liquid rocket engine nozzle.

[0019] Compared with the prior art, the flow pulsation generator provided by the present invention has at least the following beneficial effects: 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 driving mechanism. The generator body is formed with a fluid channel 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, wherein the first mounting through hole and the second mounting through hole are respectively located on both sides of the fluid channel in the radial direction of the fluid channel and are connected to the fluid channel, so that the cross section of the fluid channel along the axial direction can overlap with the cross section of the first mounting through hole and the second mounting through hole along the radial direction in a large area, so as to facilitate widening the area size of the flow adjustment area surrounded by the flow amplitude modulation unit and the rotor unit, so that the fluid can have a wider amplitude range; The rotor unit is arranged in the first mounting through hole and is rotatably connected to the generator body, and is connected to the driving mechanism so as to rotate in the first mounting through hole under the drive of the driving mechanism, and the flow amplitude modulation unit is arranged in the second mounting through hole and forms 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, thereby realizing the adjustment of the opening size of the flow regulation area, so as to obtain pulsations of different amplitudes; in addition, the rotor unit rotates in the first mounting through hole under the drive of the driving mechanism, and different parts of the rotor unit can form a flow regulation area with the flow amplitude modulation unit during the rotation process. During the rotation of the rotor unit, the flow channel 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, so as to realize pulsations of different amplitudes and oscillation forms.

[0020] Therefore, by adjusting the output speed of the driving mechanism during the rotation of the rotor unit, pulsation of the fluid with different frequencies can be achieved; and by adjusting the shape of the rotating part of the rotor unit in the fluid channel, pulsation that is not limited to the sinusoidal form can be obtained, such as triangular wave or square wave forms and other fluid pulsations of different oscillation forms; by adjusting the deviation distance between the center of the rotor unit shaft and the fluid channel, or adjusting the area occupied by the flow modulation unit on the fluid channel, pulsation of the fluid flow with different amplitudes can be achieved. In summary, the flow pulsation generator provided by the present invention is capable of adjusting the oscillation form and amplitude of the fluid flow pulsation based on the above-mentioned structural design. Compared with the use of a wheel for fluid flow regulation, it occupies less space and has more flexible flow output.

[0021] Other features and advantages of the flow pulsation generator provided by the present invention will be further described in the subsequent specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for use in the specific implementation or the prior art description. Obviously, the drawings described below are some implementations of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic cross-sectional view of a flow pulsation generator along the axial direction of a fluid channel according to an embodiment of the present invention; Figure 2 A partial schematic cross-sectional view of a flow pulsation generator along the axial direction of a fluid channel provided according to an embodiment of the present invention; Figure 3A schematic cross-sectional view of a flow pulsation generator provided according to an embodiment of the present invention along the axial direction of a first mounting through hole; Figure 4 A top view of the overall structure of a flow pulsation generator provided according to an embodiment of the present invention.

[0024] The reference numerals are as follows: 10. Generator body; T, fluid channel; A, first mounting through hole; B, second mounting through hole; D, radial direction; 20. Rotor unit; 21. rotating shaft; 22. rotating wheel; 23. connecting piece; E. adjusting surface; 30. Flow modulation unit; 31. Amplitude modulation slider; 311. Threaded hole; 32. Amplitude adjustment block; 321. Connecting part; 322. Screw part; 3221. Connecting section; 3222. Position limiting section; 33. Stroke control part; T1. Flow adjustment area; 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; 50. Bearings; 60. Install the base; 70. End cap; 80. Pipe joint; S1, first sealing member; S2, second sealing member; S3, third sealing member. DETAILED DESCRIPTION

[0025] In the description of the present invention, it is necessary to understand that if terms such as "center", "inside", "outside", "axial", "radial", and "circumferential" appear in the description indicating the orientation or position relationship, unless otherwise specified, it is understood that the orientation or position relationship is based on the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 on the present invention.

[0026] In addition, if there is a feature defined as "first" or "second", it is only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly include at least one of the defined features. If there is a description of "plurality", the general meaning is to include at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0029] It should be noted that the flow pulsation generator provided in the embodiment of the present invention is mainly used in the liquid rocket engine nozzle injection dynamic characteristics experiment to simulate the flow pulsation of the liquid rocket engine nozzle. Among them, the fluid in the fluid channel T of the flow pulsation generator is liquid. Due to its incompressibility (under normal conditions), the generation and transmission mode of the flow pulsation of the liquid is different from that of the gas. When simulating the flow pulsation of the liquid rocket engine nozzle, the liquid flows through the fluid channel T. The fluid channel T is a variable cross-section channel under the cooperation of the rotor unit 20 and the flow amplitude modulation unit 30, which enables the flow pulsation generator to generate flow change characteristics such as flow pulsation frequency, amplitude, waveform, etc. similar to those of a real nozzle.

[0030] Based on the above, the general inventive concept of the embodiment of the present invention is to provide a flow pulsation generator. Through the structural design of the flow pulsation generator, the flow pulsation generator is mainly composed of a generator body 10, a rotor unit 20, a flow amplitude modulation unit 30 and a driving mechanism 40. The generator body 10 is the main structure for generating fluid pulsation, and is formed by a fluid channel T. A first mounting through hole A and a second mounting through hole B are respectively formed on both sides of the radial direction D of the fluid channel T. The first mounting through hole A and the second mounting through hole B are both connected to the fluid channel T and have a partially overlapping area, so as to respectively install the rotor unit 20 and the flow amplitude modulation unit 30. The flow amplitude modulation unit 30 and the rotor unit 20 together form a flow regulation area T1. The fluid passes through the flow regulation area T1 when passing through the fluid channel T, and the flow amplitude modulation unit 30 can perform a translational movement toward or away from the rotor unit 20 to adjust the opening size of the flow regulation area T1, thereby causing the cross-sectional area size of the flow regulation area T1 to change, so as to obtain fluid pulsations of different amplitudes; at the same time, the rotor unit 20, driven by the driving mechanism 40, can rotate in the first mounting through hole A, and during the rotation process, cause the flow channel cross-sectional area of ​​the flow regulation area T1 to change, so as to obtain fluid pulsations of different oscillation forms.

[0031] Based on the above general inventive concept, please refer to Figure 1~Figure 4 As shown, an embodiment of the present invention provides a flow pulsation generator, including: a generator body 10, which is formed with a fluid channel T, a first mounting hole A and a second mounting hole B, the first mounting hole A and the second mounting 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 connected to the fluid channel T; a rotor unit 20, which is arranged in the first mounting hole A and rotatably connected to the generator body 10; a flow amplitude modulation unit 30, which is arranged in the second mounting hole B and forms a flow regulation area T1 with the rotor unit 20, and the flow amplitude modulation unit 30 is arranged to be able to move close to or away from the rotor unit 20 in the radial direction D to adjust the opening size 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 and the flow amplitude modulation unit 30 form a flow regulation area T1 to adjust the flow channel cross-sectional area of ​​the flow regulation area T1.

[0032] It can be understood that the fluid channel T formed in the generator body 10 in this embodiment can allow fluid to pass through, and the first mounting through hole A and the second mounting through hole B formed in the generator body 10 are arranged offset from the axis of the fluid channel T. The first mounting through hole A and the second mounting through hole B are distributed on both sides of the central axis of the fluid channel T (i.e., in the radial direction D of the fluid channel T) facing each other, and are both connected to the fluid channel T. The first mounting through hole A is equipped with a rotor unit 20 that can rotate under the drive mechanism 40, and the second mounting through hole B is equipped with a flow amplitude modulation unit 30 that can approach or move away from the rotor unit 20 in the direction of the rotor unit 20. The rotor unit 20 and the flow amplitude modulation unit 30 are connected to each other. 0 can enclose a flow regulating area T1 in the fluid channel T. The flow amplitude modulation unit 30 increases or decreases the overall cross-sectional area of ​​the flow regulating area T1 by moving closer to or away from the rotor unit 20, so as to adjust the opening size of the flow regulating area T1 and realize the adjustment of the maximum amplitude of the fluid pulsation. Moreover, during the rotation of the rotor unit 20, the surface of the rotor unit 20 on the side relative to the flow amplitude modulation unit 30 continuously changes due to the rotation, so that different parts of the rotor unit 20 and the flow amplitude modulation unit 30 enclose the flow regulating area T1. The flow channel cross-sectional area of ​​the flow regulating area T1 continuously changes due to the rotation of the rotor unit 20, thereby realizing pulsation in different oscillation forms.

[0033] Therefore, the first mounting through hole A and the second mounting through hole B formed by the generator body 10 are arranged offset from the axis of the fluid channel T, which is more conducive to obtaining a larger area of ​​the flow regulation area T1; by changing the shape of the part that hinders the flow regulation area T1 during the rotation of the rotor unit 20, a fluid pulsation similar to a sine wave form, a triangular wave form or various other forms can be obtained; and by adjusting the output speed of the driving mechanism 40, the fluid can present 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 channel T in the radial direction of the fluid channel T and are connected to the fluid channel, by adjusting the occupancy rate of the flow amplitude modulation unit 30 in the fluid channel T, different maximum amplitudes of the fluid pulsation can be obtained; and by adjusting the deviation distance of the center of the rotor unit 20 shaft from the axis of the fluid channel T, the amplitude adjustment of the flow pulsation can be further achieved.

[0034] The flow pulsation generator provided in this embodiment has a compact structure, and most of the components are integrated into the generator body 10, which has more space occupancy advantages compared to the roulette-type flow pulsation generator.

[0035] 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 embodiment of the present application is located in the fluid channel T, and the flow amplitude modulation unit 30 can control the opening size of the flow regulation area T1, that is, when the flow amplitude modulation unit 30 moves away from the rotor unit 20, the flow channel cross-sectional area of ​​the flow regulation area T1 increases, and when the flow amplitude modulation unit 30 moves close to the rotor unit 20, the flow channel cross-sectional area of ​​the flow regulation area T1 decreases, so as to obtain different maximum amplitudes of fluid pulsation; and during the rotation of the rotor unit 20, the surfaces of different parts rotate in the fluid channel T, so that the flow channel cross-sectional area of ​​the flow regulation area T1 changes, and the rotating part of the rotor unit 20 in the fluid channel T can obtain pulsations of different oscillation forms by designing different shapes.

[0036] In the embodiment of the present invention, reference 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. The cross-section of the first mounting through hole A partially coincides with the cross-section of the fluid channel T. The rotor unit 20 partially passes through the fluid channel T during the rotation process, so that the cross-sectional area of ​​the flow channel in the flow regulation zone 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 other shapes, the second mounting through hole B can also adapt to the design, which can ensure the movement of the flow amplitude modulation unit B toward or away from the rotor unit 20.

[0037] In some specific embodiments, the fluid channel T extends along its axial direction, the first mounting hole A is located on the radial direction D of the fluid channel T and at the bottom of the fluid channel T, and the second mounting hole B is located on the radial direction D of the fluid channel T and at the top of the fluid channel T. The first mounting hole A and the second mounting hole B deviate from the central axis of the fluid channel T and are designed to be relatively parallel, so as to facilitate the flow adjustment area T1 to have a larger area, thereby making the amplitude and oscillation form of the fluid pulsation have a wider adjustable range.

[0038] In order to make the fluid pulsation change periodically, refer to Figure 2 In some embodiments, the rotor unit 20 has a plurality of adjustment surfaces E with the same structure 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 form a flow adjustment area T1 with the flow amplitude modulation unit 30 to periodically adjust the flow channel cross-sectional area of ​​the flow adjustment area T1.

[0039] The rotor unit 20 has a plurality of adjustment surfaces E of the same structure connected in sequence along its circumference. By designing the number of adjustment surfaces E and the angle between two adjacent adjustment surfaces E, the plurality of adjustment surfaces E can form a non-circular cross-sectional shape. When the driving mechanism 40 drives the rotor unit 20 to rotate, the plurality of adjustment surfaces E can form a flow adjustment area T1 in sequence with the flow amplitude modulation unit 30, causing the flow adjustment area T1 to change periodically with the rotation of the rotor unit 20, thereby causing 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.

[0040] It should be understood that the multiple adjustment surfaces E in this embodiment can be 3, 4, 5, or 6 (for example, Figure 1 The angle between two adjacent adjustment surfaces E can be designed uniformly, for example, when the number of adjustment surfaces E is 4, the angle between two adjacent adjustment surfaces E can be 90°, and the cross-sectional shape formed by the four adjustment surfaces E is a square. When the rotor unit 20 rotates one circle, the fluid pulsation presents a sinusoidal periodic oscillation; the angle between two adjacent adjustment surfaces E can be designed non-uniformly, for example, when the number of adjustment surfaces E is 4, the angle between two adjacent adjustment surfaces E can be 120° and 60° respectively, and the cross-sectional shape formed by the four adjustment surfaces E can be a parallelogram. Under this non-uniform angle design, due to the different angles, the pulsation generated when the fluid flows between each adjustment surface E will have different phases and amplitudes, which makes the periodic oscillation form of the fluid more diversified. By adjusting the number and angle of the adjustment surfaces E, it is possible to achieve precise control of the fluid pulsation characteristics and obtain more diversified oscillation forms, rather than being limited to a single sinusoidal regular oscillation.

[0041] In some embodiments, the rotor unit 20 includes a rotating shaft 21, which passes through 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 with the same structure that are sequentially connected along its circumference.

[0042] The multiple adjustment 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 body 10, so as to simplify the structural design of the flow pulsation generator, reduce the number of parts, and reduce maintenance costs.

[0043] In some embodiments, reference Figure 2 The rotor unit 20 includes a rotating shaft 21, a rotating wheel 22 and a connecting piece 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 through the connecting piece 23. The rotating wheel 22 has a plurality of adjustment surfaces E connected in sequence along its circumference.

[0044] The rotor unit 20 in this embodiment includes a rotating shaft 21, a rotating wheel 22 and a connecting member 23. A plurality of adjustment surfaces E are formed on the circumference of the rotating wheel 22. The rotating wheel 22, the rotating shaft 21 and the connecting member 23 are of split design. The rotating shaft 21 is passed through the first mounting through hole A and is rotatably connected to the generator body 10 to receive the driving force provided by the driving mechanism 40. The rotating wheel 22 is sleeved on the rotating shaft 21 and connected to the rotating shaft 21 through the connecting member 23. Through the structural design of the rotor unit 20, a plurality of adjustment surfaces E are designed on the rotating wheel 22 that can be removed from the rotating shaft 21. When facing different simulation requirements, only the rotating wheel 22 needs to be replaced without replacing the rotating shaft 21, so as to meet the simulation requirements of different oscillation forms of fluid pulsation, thereby making the flow pulsation generator more flexible.

[0045] refer to Figure 2 In a specific embodiment, a slot is designed on the outer edge of the rotating shaft 21, and the connecting piece 23 is embedded in the slot and partially protrudes from the slot. The rotating wheel 22 is designed with a matching slot adapted to the connecting piece 23. The rotating wheel 22 is sleeved on the surface of the rotating shaft 21, and one end of the connecting piece 23 away from the rotating shaft 21 is clamped in the matching slot of the rotating wheel 22, thereby realizing a tight connection between the rotating wheel 22 and the rotating shaft 21 to prevent the rotating wheel 22 from deviating during the rotation process and affecting the simulation effect of fluid pulsation.

[0046] In order to ensure the rotation of the rotating shaft 21 in the generator body 10, in some embodiments, the axial ends of the rotating shaft 21 are rotatably connected to the generator body 10 through bearings 50. That is to say, in the embodiment of the present invention, two bearings 50 are designed to be spaced apart along the axial direction of the rotating shaft 21, and the axial ends of the rotating shaft 21 are respectively inserted into the two bearings 50, so as to perform rotational motion under the drive of the driving mechanism 40, and the generator body 10 will not be affected during the rotational motion.

[0047] In some embodiments, multiple adjustment surfaces E are connected in sequence and enclosed into a regular polygon structure or a sawtooth structure. For example, multiple adjustment surfaces E are connected in sequence and enclosed into a regular polygon structure that 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 be periodically changed. Compared with the structure of irregular shape, multiple adjustment surfaces E are connected in sequence and enclosed into a regular polygon structure or a sawtooth structure. Under the same driving power, it is more conducive to increasing the oscillation frequency of the fluid pulsation, so that the flow pulsation generator has a higher simulation efficiency.

[0048] When the fluid flows through the regular polygonal part, the shape of the impeller 22 in the fluid channel T changes, causing the cross-sectional area of ​​the fluid to change accordingly, thereby causing the fluid to change periodically. At the same time, the cross-sectional area will change periodically multiple times when the shaft 21 rotates one circle, thereby achieving a high-frequency pulsation effect.

[0049] refer to Figure 1 and Figure 2 In order to adjust the opening size of the flow regulating zone T1, in some embodiments, the flow amplitude modulation unit 30 includes: 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, including a connecting portion 321 and a screw portion 322, the connecting 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 in the second mounting through hole B and is threadedly connected to the amplitude modulation 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 modulation slider 31 can move in the second mounting through hole B along the radial direction D.

[0050] In this embodiment, the amplitude modulation slider 31 is arranged in the second mounting through hole B, and a threaded hole 311 is opened on a side of the amplitude modulation slider 31 away from the fluid channel T. The connecting portion 321 of the amplitude adjustment block 32 is located outside the second mounting through hole B in the direction of the second mounting through hole B away from the fluid channel T, and is connected to the outer surface of the generator body 10, thereby realizing the sealing of the second mounting through hole B, and the screw portion 322 of the amplitude adjustment block 32 is located in the second mounting through hole B and is threadedly connected to the amplitude modulation slider 31 through the threaded hole 311. By adjusting the depth of the screw portion 322 screwed into the threaded hole 311, the amplitude modulation 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 size of the flow adjustment area T1 is adjusted, so that the fluid pulsation has amplitudes of different sizes.

[0051] It should be understood that the connecting portion 321 and the screw portion 322 in the present embodiment can be integrally formed or can be designed in a split style. When the connecting portion 321 and the screw portion 322 are integrally formed, the opening size of the flow regulating 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 is suitable for a simulation environment where the opening size of the flow regulating area T1 does not need to be frequently adjusted, which is beneficial to saving the number of parts to simplify the structure of the flow pulsation generator.

[0052] When the connecting portion 321 and the screw portion 322 are designed to be split, the connecting portion 321 is provided with a mounting hole facing the second mounting through hole B, and the screw portion 322 can be a bolt. The screw portion 322 is inserted into the mounting hole and can rotate in the mounting hole. The end of the screw portion 322 away from the mounting hole is threadedly connected to the threaded hole 311. During the operation of the flow pulsation generator, when the opening size of the flow adjustment area T1 is required, it is only necessary to use an adjustment tool to rotate and adjust the end of the screw portion 322 away from the threaded hole 311 without disassembling the flow pulsation generator, thereby achieving the adjustment of the opening size of the flow adjustment area T1, thereby making the flow pulsation generator more flexible.

[0053] refer to Figure 1 and Figure 2 In order to avoid the interference of the amplitude modulation slider 31 with the rotation of the rotor unit 20, in some embodiments, the flow amplitude modulation unit 30 also includes a stroke control member 33, and the stroke control member 33 is fixedly arranged in the threaded hole 311; the screw 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 is penetrated by the stroke control member 33, 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 abut against the stroke control member 33 to limit the movement stroke of the amplitude modulation slider 31 along the radial direction D.

[0054] The screw rod portion 322 in the present 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 the limiting section 3222; the stroke control member 33 is an annular member, the stroke control member 33 is fixedly arranged in the threaded hole 311, the connecting section 3221 is penetrated in the stroke control member 33, and the limiting section 3222 is located at the side of the stroke control member 33 away from the connecting section 321 and is threadedly connected to the threaded hole 311, the bottom of the stroke control member 33 can abut against the end surface of the limiting section 3222 protruding from the top of the connecting section 3221, so that the maximum stroke of the amplitude modulation slider 31 toward the rotor unit 20 is limited, and the amplitude modulation slider 31 can only move toward the rotor unit 20 to be tangent to the rotation circle of the rotor unit after being adjusted by the screw rod portion 322, so as to avoid interference with the rotation of the rotor unit 20 and damage to the components.

[0055] refer to Figure 3 and Figure 4 In order to realize the rotation of the rotor unit 20, in some embodiments, the driving mechanism 40 includes: a mounting shell 41, which is located at one end of the generator body 10 in the axial direction of the first mounting through hole A and is sealed and connected to the generator body 10; a magnetic coupling connector 42, which is installed on the mounting shell 41 and connected to the rotor unit 20; and a driving 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.

[0056] The mounting shell 41 in this embodiment is located at one end of the generator body 10 in the axial direction of the first mounting through hole A and is sealed and connected to the generator body 10, while the magnetic coupling connector 42 is mounted on the mounting shell 41 and is key-connected to the rotor unit 20, and the driving component 43 is arranged at one end away from the generator body 10 in the axial direction of the first mounting through hole A and is connected to the magnetic coupling connector 42; during the operation of the flow pulsation generator, the driving component 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 part of the rotor unit 20 in the fluid channel T, so that the flow channel cross-sectional area of ​​the flow regulation zone T1 changes in real time.

[0057] Further, refer 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 on the outside of the mounting shell 41 and connected to the driving component 43; and a magnetic coupling inner rotor 422, which is arranged on the inside of the mounting shell 41 and 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.

[0058] The magnetically coupled outer rotor 421 in this embodiment is sleeved on the outside of the mounting shell 41 and connected to the drive component 43. It can rotate on the mounting shell 41 under the drive of the drive component 43; the magnetically coupled inner rotor 422 is arranged in the mounting shell 41, and the magnetically coupled inner rotor 422 has a connecting hole axially opened along the first mounting through hole B. One end of the rotor unit 20 is arranged in the connecting hole and is keyed to the magnetically coupled inner rotor 422. The magnetically coupled inner rotor 422 rotates under the magnetic force of the magnetically coupled outer rotor 421, thereby driving the rotor unit 20 to rotate, so that the cross-sectional area of ​​the flow channel in the flow regulation zone T1 changes in real time.

[0059] The magnetic coupling connector 42 designed in this embodiment can enable the system to still achieve the transmission effect from the drive component 43 to the rotor unit 20 under low temperature conditions and high rotation speeds, realize the contactless transmission of the magnetically coupled inner rotor 422, avoid direct contact and wear in traditional mechanical transmission, and thus extend the service life of the flow pulsation generator; and, the contactless transmission design can ensure the sealed connection between the mounting shell 41 and the generator body 10, so as to improve the sealing 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 drive component 43, the rotation speed and direction of the rotor unit 20 can be flexibly adjusted, thereby achieving precise control of the fluid flow.

[0060] It should be noted that the magnetically coupled outer rotor 421 and the magnetically coupled inner rotor 422 in this embodiment are blocked by the mounting shell 41. In order to avoid the influence of the magnetic force generated on the magnetically coupled outer rotor 421, the mounting shell 41 should have a wall thickness as thin as possible while ensuring the structural strength, and materials with lower magnetic resistance and conductivity can be used as the material of the mounting shell, thereby alleviating the attenuation of the magnetic force when passing through the material, improving the magnetic coupling efficiency, and ensuring the reliable rotation of the rotor unit 20 in the flow pulsation generator and the accuracy of flow regulation.

[0061] In order to improve the stability of the flow pulsation generator, in some embodiments, reference Figure 3 The flow pulsation generator also includes: a mounting base 60, on which the generator body 10 is mounted; an end cover 70, which is axially arranged at one end of the generator body 10 away from the magnetic coupling connector 42 along the first mounting through hole A and is sealed and connected to the generator body 10; and two pipe joints 80, which are respectively arranged at both ends of the fluid channel T along the axial direction of the fluid channel T and connected to the generator body 10.

[0062] The mounting base 60 is arranged at the bottom of the generator body 10, and the generator body 10 is fixed on the mounting base 60, and the mounting base 60 provides a stable support foundation for the generator body 10; the end cover 70 is arranged at the end of the generator body 10 away from the magnetic coupling connector 42 along the axial direction of the first mounting through hole A and is sealed and connected to the generator body 10, so as to cooperate with the mounting shell 41 to achieve the overall sealing of the first mounting through hole A; two pipe joints 80 are respectively arranged at the two ends of the fluid channel T along the axial direction of the fluid channel T and connected to the generator body 10 for the supply and output of the fluid.

[0063] Since fluid pulsation usually operates under higher fluid pressure conditions, in order to improve the fluid sealing of the flow pulsation generator, refer to Figure 3 The flow pulsation generator in the embodiment of the present invention also includes: a first seal S1, which seals and connects the amplitude adjustment block 32 and the generator body 10; a second seal S2, which seals and connects the mounting shell 41 and the generator body 10; and a third seal S3, which seals and connects the end cover 70 and the generator body 10.

[0064] In this embodiment, the first seal S1, the second seal S2 and the third seal S3 can all be sealing gaskets. The first seal S1 is arranged between the amplitude adjustment block 32 and the generator body 10. Specifically, a mounting groove can be opened on the generator body 10. The first seal S1 is arranged in the mounting groove opened on the generator body 10 and abuts against the amplitude adjustment block 32 to seal the end of the second mounting through hole B away from the rotor unit 20; the second seal S2 is arranged between the mounting shell 41 and the generator body 10. Specifically, a mounting groove can be opened on the mounting shell 41. The second seal S2 is arranged in the mounting groove opened on the mounting shell 41 The third sealing member S3 is arranged between the end cover 70 and the generator body 10, and a mounting groove can be provided on the end cover 70. The third sealing member S3 is arranged in the mounting groove provided on the end cover 70 and abuts against the generator body 10 to seal the end cover 70 and the generator body 10. The three sealing members are all static seals, which effectively realize the sealing isolation of the first mounting through hole A and the second mounting through hole B from the external environment, so as to facilitate the operation of the fluid pulsation under higher fluid pressure conditions.

[0065] In some embodiments, reference Figure 3 and Figure 4 The driving assembly 43 includes: a mounting bracket 431 connected to the mounting base 60; and a driving motor 432 disposed on the mounting bracket 431.

[0066] The mounting bracket 431 in this embodiment is connected to the mounting base 60, and the drive motor 432 is installed and fixed on the mounting bracket 431 to provide stability for the drive motor 432. The output shaft of the drive motor 432 is key-connected to the magnetically coupled outer rotor 421 to provide the driving force required for the magnetically coupled outer rotor 421 to rotate.

[0067] In some embodiments, the fluid in the fluid channel T of the flow pulsation generator is liquid, so as to simulate the flow pulsation of the liquid rocket engine nozzle, thereby realizing the simulation requirements of the liquid rocket engine nozzle under different working conditions.

[0068] In summary, the flow pulsation generator provided in the embodiment of the present invention can diversify the oscillation form of fluid pulsation and can realize fluid pulsation regulation of different amplitudes. Compared with the disc-type fluid flow regulation, it is more flexible and has a smaller space occupancy rate.

[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. Those skilled in the art may change, modify, replace and vary 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) is connected to the rotor unit (20) and drives 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 regulation area (T1) to adjust the flow channel cross-sectional area of ​​the flow regulation area (T1).

2. The flow pulsation generator according to claim 1, characterized in that: 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 regulating surfaces (E) can sequentially enclose the flow regulating area (T1) with the flow amplitude modulation unit (30) to periodically adjust the flow channel cross-sectional area of ​​the flow regulating area (T1).

3. The flow pulsation generator according to claim 2, characterized in that: The rotor unit (20) comprises a rotating shaft (21), the rotating shaft (21) is passed through the first mounting through hole (A) and is rotatably connected to the generator body (10), and the rotating shaft (21) has a plurality of adjusting 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 adjusting surfaces (E) sequentially connected along its circumference.

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

5. The flow pulsation generator according to claim 1, characterized in that: 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).

6. The flow pulsation generator according to claim 5, 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).

7. 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).

8. The flow pulsation generator according to claim 7, 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.

9. The flow pulsation generator according to claim 7, 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).

10. The flow pulsation generator according to any one of claims 1 to 9, 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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