Synthetic jet exciter based on thermoacoustic refrigeration effect

Abstract

The synthetic jet exciter based on the thermo-acoustic refrigeration effect comprises a left thermo-acoustic refrigeration unit and a right thermo-acoustic refrigeration unit which are symmetrically arranged, each thermo-acoustic refrigeration unit comprises a cold-end heat exchanger, honeycomb ceramic and a hot-end heat exchanger which are connected in sequence, the hot-end heat exchangers are connected with a resonant tube, and the two cold-end heat exchangers are both communicated with a sound cavity; the acoustic cavity is of a cross tube structure, the two ends of a short tube of the cross tube are connected with the two cold-end heat exchangers respectively, and the jet flow plate and the acoustic driver are installed at the two ends of a long tube of the cross tube respectively. The synthetic jet exciter and the thermoacoustic refrigeration unit are combined, the function that the synthetic jet exciter continuously sprays low-temperature fluid is achieved through the thermoacoustic refrigeration effect, the cooling effect of the high-temperature surface is enhanced, and the technical problems that after a traditional synthetic jet exciter operates for a long time, the jet temperature becomes high, and the cooling effect becomes poor are solved.

Description

Technical Field

[0001] The invention relates to the fields of thermoacoustic refrigeration and synthetic jets, in particular to a synthetic jet actuator which utilizes the thermoacoustic refrigeration principle to reduce the jet temperature. Background Art

[0002] A synthetic jet is a discontinuous jet generated by an actuator that alternately blows and sucks the surrounding fluid. The actuator usually includes an acoustic driver and a sound cavity connected to the external fluid through an orifice. When the actuator is working, it alternately blows and sucks the fluid. The blown fluid forms a vortex ring through shearing and moves away from the orifice. Under certain conditions, it is not sucked back into the actuator. The notable feature of synthetic jets is that they only output momentum and have zero mass, so they are called zero-mass jets. Compared with traditional continuous flow control technology, synthetic jets have a simple structure, light weight, low cost, easy maintenance, and do not require an additional air source, so they have attracted widespread attention.

[0003] The low-temperature jet generated by the synthetic jet actuator can be used to cool the high-temperature surface. It removes heat by continuously breaking the thermal boundary layer of the high-temperature surface and reduces the temperature of the high-temperature surface. Synthetic jet cooling technology has the advantages of high cooling efficiency, no need for external fluid supply, and compact structure. It is widely used in electronic equipment, aircraft engines, and electric vehicle batteries. However, there are challenges in the practical application of synthetic jet cooling technology. For example, during long-term operation, the actuator will suck the fluid near the high-temperature surface outside the orifice back into the acoustic cavity, causing the temperature of the fluid in the acoustic cavity to rise and the impact cooling efficiency to decrease; in addition, the acoustic driver will also generate heat during operation, causing the temperature of the fluid in the acoustic cavity to rise. Therefore, effective measures need to be taken to ensure the stable and efficient operation of the synthetic jet actuator.

[0004] Thermoacoustic refrigeration technology is an advanced refrigeration technology with broad application prospects. The technology is based on the thermoacoustic effect, that is, the working gas is compressed and expanded under the action of sound waves, resulting in periodic temperature changes; the working gas exchanges heat with the surrounding solid wall during the compression and expansion process to form a refrigeration cycle. Thermoacoustic refrigerators usually consist of a resonance tube, a regenerator, a heat exchanger and an acoustic driver. The acoustic driver generates sound waves of a certain frequency to drive the working gas to oscillate back and forth in the resonance tube. The regenerator has a porous structure and interacts with the oscillating gas to transfer heat from one end of the regenerator to the other end. The two ends of the regenerator are connected to the heat exchanger respectively; if the temperature of the high-temperature end heat exchanger is controlled at room temperature, the temperature of the low-temperature end heat exchanger is lower than room temperature, producing a cooling effect. Thermoacoustic refrigerators usually use air or inert gas as the working gas, do not require any refrigerant, and will not pollute the environment. Thermoacoustic refrigeration technology has the advantages of fewer mechanical moving parts, low maintenance cost, and long service life. However, how to combine thermoacoustic cooling technology with synthetic jet technology to reduce the temperature of the synthetic jet and improve cooling efficiency is a difficult problem. Summary of the invention

[0005] The technical problem to be solved by the present invention is: after the existing synthetic jet actuator runs for a long time, the temperature of the fluid in the acoustic cavity increases and the cooling efficiency decreases. Thermoacoustic cooling technology can effectively reduce the temperature of the fluid in the acoustic cavity without significantly changing the structure of the synthetic jet actuator. How to combine thermoacoustic cooling technology with synthetic jet technology to enhance the cooling effect of synthetic jets.

[0006] The technical solution adopted by the present invention is: A synthetic jet actuator based on thermoacoustic refrigeration effect, comprising two symmetrically arranged thermoacoustic refrigeration units on the left and right, wherein the thermoacoustic refrigeration unit comprises a cold-end heat exchanger, a honeycomb ceramic and a hot-end heat exchanger connected in sequence, the hot-end heat exchanger is connected to a resonance tube, and both cold-end heat exchangers are connected to an acoustic cavity; The acoustic cavity is a cross-tube structure, two ends of a short cross-tube are respectively connected to two cold-end heat exchangers, and two ends of a long cross-tube are respectively installed with a jet plate and an acoustic driver.

[0007] In the aforementioned synthetic jet actuator based on the thermoacoustic cooling effect, the jet plate is arranged perpendicular to the axis of the short tube of the acoustic cavity, and a jet hole is opened in the center of the jet plate.

[0008] The aforementioned synthetic jet actuator based on thermoacoustic cooling effect is provided with heat exchange fins inside the acoustic cavity. A plurality of heat exchange fins are arranged in parallel along the axial direction of the acoustic cavity short tube. The heat exchange fins are made of copper and are arranged at equal intervals between adjacent heat exchange fins.

[0009] The aforementioned synthetic jet actuator based on the thermoacoustic cooling effect has a porous heat exchange structure arranged inside the acoustic cavity along the axial direction of the acoustic cavity short tube, and the porous heat exchange structure includes a heat exchange structure body, and a plurality of pores are arranged on the heat exchange structure body along the axial direction of the acoustic cavity short tube.

[0010] The aforementioned synthetic jet actuator based on thermoacoustic refrigeration effect, wherein one side of the cold-end heat exchanger is closely attached to the honeycomb ceramic, and the other side is connected to the heat exchange fins; the cold-end heat exchanger includes a circular outer wall, and a plurality of parallel plate fins are arranged inside the outer wall parallel to the central axis direction of the resonance tube.

[0011] In the aforementioned synthetic jet actuator based on thermoacoustic cooling effect, the honeycomb ceramic is made of alumina, has a plurality of square through holes inside, and has a porosity of 0.8.

[0012] The aforementioned synthetic jet exciter based on the thermoacoustic cooling effect, wherein one side of the hot end heat exchanger is closely attached to the honeycomb ceramic and the other side is connected to the resonance tube, the hot end heat exchanger comprises a circular outer wall 2, a plate-fin structure is arranged inside the outer wall parallel to the central axis direction of the resonance tube, the plate-fin structure comprises two vertical plates perpendicular to the axial direction of the outer wall, a plurality of parallel plate fins 2 are arranged between the two vertical plates and on the outside of the vertical plates, a cooling water channel is opened along the inside of the two vertical plates, and a hole is opened on the outer wall 2 at a position corresponding to the cooling water channel.

[0013] The aforementioned synthetic jet actuator based on the thermoacoustic cooling effect, the acoustic cavity is a cross-tube structure, the material is aluminum alloy, the cross-tube structure includes pipes in four directions, the long tube with the acoustic driver installed is 60 mm long, and the long tube with the jet plate installed is 120 mm long.

[0014] In the aforementioned synthetic jet actuator based on the thermoacoustic cooling effect, the acoustic driver adopts a loudspeaker, which is driven by a sweeper to generate sound waves of specific frequency and amplitude.

[0015] The aforementioned synthetic jet actuator based on the thermoacoustic cooling effect, the acoustic driver adopts piezoelectric ceramics, and the piezoelectric ceramics are driven by a signal transmitter and a power amplifier to generate sound waves of specific frequency and amplitude.

[0016] The aforementioned synthetic jet actuator based on the thermoacoustic refrigeration effect, the acoustic driver adopts a reciprocating piston, and the reciprocating piston is driven by a crank-connecting rod mechanism to generate sound waves of specific frequency and amplitude.

[0017] Beneficial effects achieved by the present invention: The synthetic jet actuator of the present invention combines a traditional synthetic jet actuator with a thermoacoustic refrigeration unit, utilizes the thermoacoustic effect to achieve refrigeration, and cools the fluid in the acoustic cavity of the synthetic jet actuator through heat exchange fins, so that the jet plate can continuously spray low-temperature fluid to cool the high-temperature surface, solving the problem of excessively high fluid temperature in the acoustic cavity after long-term operation in traditional synthetic jet cooling technology, and providing a more efficient and reliable solution for synthetic jet cooling technology.

[0018] The present invention adds a thermoacoustic cooling unit to the traditional synthetic jet actuator. The whole system has no complicated mechanical moving parts, has a simple structure, is safe and reliable, and has low maintenance cost.

[0019] The acoustic driver of the present invention can adopt a variety of schemes: for high-power equipment, a rotating motor can be used to drive the piston to reciprocate to generate large-amplitude sound pressure fluctuations; and for low-power equipment, a speaker or piezoelectric ceramics can be used to generate small-amplitude sound pressure fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Schematic diagram of the overall structure of the synthetic jet actuator in Example 1; Figure 2 is a cross-sectional view of the synthetic jet actuator in the ZY plane in Example 1; Figure 3 is an XY plane cross-sectional view of the synthetic jet actuator in Example 1; Figure 4 Schematic diagram of the structure of the jet plate in Example 1; Figure 5 Schematic diagram of the heat exchange fin structure in Example 1; Figure 6 Schematic diagram of the cold end heat exchanger structure in Example 1; Figure 7 Schematic diagram of the honeycomb ceramic structure in Example 1; Figure 8 Schematic diagram of the structure of the hot end heat exchanger in Example 1; Fig. 9 is a schematic diagram of the resonance tube structure in Example 1; Fig.10 Schematic diagram of the acoustic cavity structure in Example 1; Fig.11 Schematic diagram of the overall structure of the synthetic jet actuator in Example 1; Fig.12 Schematic diagram of the overall structure of the synthetic jet actuator in Example 2; Fig.13 Schematic diagram of the overall structure of the synthetic jet actuator in Example 3.

[0021] Figure numerals: 1. jet plate, 11. jet hole, 2. heat exchange fin, 3. cold end heat exchanger, 31. outer wall one, 32. plate fin one, 4. honeycomb ceramic, 5. hot end heat exchanger, 51. outer wall two, 52. vertical plate, 53. plate fin two, 54. cooling water channel, 6. resonance tube, 7. sound cavity, 71. short tube, 72. long tube, 8. speaker, 9. piezoelectric ceramic, 10. reciprocating piston. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Example 1

[0023] As shown in Figure 1, Figure 2 and Figure 3 As shown, this embodiment provides a synthetic jet actuator based on the thermoacoustic refrigeration effect, including two symmetrically arranged thermoacoustic refrigeration units on the left and right, wherein the thermoacoustic refrigeration unit includes a cold-end heat exchanger 3, a honeycomb ceramic 4 and a hot-end heat exchanger 5 connected in sequence, the hot-end heat exchanger 5 is connected to a resonance tube 6, and both cold-end heat exchangers 3 are connected to an acoustic cavity 7; The acoustic cavity 7 is a cross-tube structure, the two ends of the short cross-tube 71 are respectively connected to the two cold end heat exchangers 3, and the two ends of the long cross-tube 72 are respectively installed with a jet plate and an acoustic driver. The acoustic cavity and the resonance tube are filled with working gas, usually air.

[0024] like Figure 4 As shown, the jet plate 1 is arranged perpendicular to the short tube axis of the acoustic cavity 7, the jet plate 1 has a thickness of 10 mm and a diameter of 46 mm, and a jet hole 11 is opened in the center of the jet plate 1 with a diameter of 3 mm - 7 mm.

[0025] like Figure 5 As shown, a heat exchange fin 2 is arranged inside the acoustic cavity 7. The heat exchange fin 2 is arranged in parallel along the axial direction of the acoustic cavity short tube. The heat exchange fin 2 is made of copper. Adjacent heat exchange fins are arranged at equal intervals with a spacing of 3 mm. Each heat exchange fin is 60 mm long and 1 mm thick. The heat exchange fin 2 is in contact with the cold end heat exchanger to maintain a low temperature. At the same time, it exchanges heat with the oscillating fluid in the acoustic cavity long tube to reduce the temperature of the oscillating fluid in the acoustic cavity. The parallel plate structure heat exchange fins are used, which has a relatively simple structure and is easy to process.

[0026] like Figure 6 As shown, one side of the cold end heat exchanger 3 is close to the honeycomb ceramic, and the other side is connected to the heat exchange fin 2. The cold end heat exchanger includes a circular outer wall 31, the outer wall 31 has an axial length of 5 mm, and a plurality of parallel plate fins 32 are arranged inside the outer wall parallel to the central axis of the resonance tube, the plate fin thickness is 1 mm, the spacing is 1 mm, and the axial length is 3 mm. The parallel channels between the parallel plate fins are reciprocating oscillating fluids, one side of the parallel plate fins is close to the honeycomb ceramic, and the other side is connected to the heat exchange fin 2. Due to the thermoacoustic refrigeration effect, the honeycomb ceramic absorbs heat from the parallel plate fins of the cold end heat exchanger, reducing the temperature of the parallel plate fins, and then reducing the temperature of the heat exchange fins connected to the parallel plate fins.

[0027] like Figure 7 As shown, the honeycomb ceramic 4 is made of alumina, is 40 mm long, has a plurality of square through holes inside, the size of the square through holes is 1 mm×1 mm, and the porosity is 0.8.

[0028] like Figure 8As shown, one side of the hot end heat exchanger 5 is close to the honeycomb ceramic 4, and the other side is connected to the resonance tube 6. The hot end heat exchanger includes a circular outer wall 51, the outer wall 51 has an axial length of 5 mm, and a plate-fin structure is arranged inside the outer wall parallel to the central axis of the resonance tube. The plate-fin structure includes two vertical plates 52 perpendicular to the axial direction of the outer wall, and a plurality of parallel plate fins 53 are arranged between the two vertical plates and outside the vertical plates. The plate fins are 1 mm thick, 1 mm apart, and 3 mm long in the axial direction. A cooling water channel 54 is opened inside the two vertical plates 52, and a hole is opened on the outer wall 51 at a position corresponding to the cooling water channel. The cooling water takes away the heat of the hot end heat exchanger, so that the temperature of the hot end heat exchanger is maintained at room temperature. The cooling water takes away the heat of the hot end heat exchanger, so that the temperature of the hot end heat exchanger is maintained at room temperature. Due to the thermoacoustic refrigeration effect, the end of the honeycomb ceramic in contact with the hot end heat exchanger is at room temperature, and the temperature of the end in contact with the cold end heat exchanger is lower than room temperature.

[0029] like Fig. 9 As shown, the resonance tube 6 is made of aluminum alloy, has an inner diameter of 46 mm, a wall thickness of 2 mm, and a length of 60 mm.

[0030] like Fig.10 As shown, the acoustic cavity 7 is a cross-tube structure made of aluminum alloy. The cross-tube structure includes pipes in four directions. The inner diameter of the pipes is 46 mm, the wall thickness is 2 mm, the long pipe with the acoustic driver is 60 mm long, and the long pipe with the jet plate is 120 mm long.

[0031] The working process of the synthetic jet actuator based on the thermoacoustic cooling effect of this embodiment is as follows: the acoustic driver generates sound waves of specific frequency and amplitude, and the gas working medium in the resonance tube and the sound cavity oscillates back and forth under the action of the sound waves. In particular, the gas working medium in the honeycomb ceramic exchanges heat with the surrounding solid wall surface during periodic compression and expansion, transfers heat from one end of the honeycomb ceramic to the other end, and generates a constant temperature difference at both ends of the honeycomb ceramic. One end of the honeycomb ceramic is connected to a hot heat exchanger, and the hot end heat exchanger takes away heat by water cooling, so that the temperature of the hot end heat exchanger is maintained at room temperature. The other end of the honeycomb ceramic is connected to a cold heat exchanger. Due to the thermoacoustic cooling effect, the heat of the cold end heat exchanger is continuously transported to the hot end heat exchanger, and the temperature of the cold end heat exchanger will be lower than room temperature. The heat exchange fins are connected to the cold end heat exchanger, and its temperature will also be lower than room temperature, so the gas working medium in the sound cavity can be effectively cooled. Under the action of the sound field, the low-temperature gas working medium in the sound cavity impacts the high-temperature surface in the form of a high-speed jet from the jet hole on the jet plate to reduce the temperature of the high-temperature surface.

[0032] like Fig.11 As shown, in this embodiment, the acoustic driver adopts a loudspeaker 8, which can be driven by a sweep frequency meter to generate sound waves of specific frequency and amplitude.

[0033] Under the action of the acoustic driver, the gas working medium in the acoustic cavity and the resonance tube oscillates periodically. The cold end heat exchanger, the honeycomb ceramic and the hot end heat exchanger are tightly connected in sequence and placed inside the resonance tube. The honeycomb ceramic interacts with the oscillating gas to produce a cooling effect, transferring the heat of the cold end heat exchanger to the hot end heat exchanger. The hot end heat exchanger maintains the ambient temperature through water cooling, and the temperature of the cold end heat exchanger is lower than the ambient temperature. Under the action of the acoustic field, the oscillating gas in the acoustic cavity is periodically inhaled and ejected at the small holes of the jet plate. The inhaled gas enters the acoustic cavity and exchanges heat with the heat exchange fins connected to the cold end heat exchanger to reduce the gas temperature in the acoustic cavity. The ejected gas impacts the high-temperature surface in the form of a high-speed jet to reduce the temperature of the high-temperature surface. The present invention combines a synthetic jet actuator with a thermoacoustic refrigeration unit, and uses the thermoacoustic refrigeration effect to realize the function of the synthetic jet actuator to continuously eject low-temperature fluid, thereby enhancing the cooling effect of the high-temperature surface and solving the technical problem that the jet temperature of the traditional synthetic jet actuator becomes high and the cooling effect becomes poor after long-term operation. Example 2

[0034] like Fig.12 As shown, this embodiment provides a synthetic jet actuator based on thermoacoustic cooling effect, including: This embodiment provides a synthetic jet actuator based on thermoacoustic cooling effect, including two symmetrically arranged thermoacoustic cooling units on the left and right, the thermoacoustic cooling unit includes a cold end heat exchanger 3, a honeycomb ceramic 4 and a hot end heat exchanger 5 connected in sequence, the hot end heat exchanger 5 is connected to the resonance tube 6, and the two cold end heat exchangers 3 are connected to the acoustic cavity 7; The acoustic cavity 7 is a cross-tube structure, with two cold-end heat exchangers 3 connected at both ends of the short cross-tube, containing heat exchange fins, and jet plates and acoustic drivers installed at both ends of the long cross-tube.

[0035] The acoustic driver adopts piezoelectric ceramics 9, which can be driven by a signal transmitter and a power amplifier to generate sound waves with specific frequency and amplitude. Example 3

[0036] like Fig.13 As shown, this embodiment provides a synthetic jet actuator based on the thermoacoustic refrigeration effect, including two symmetrically arranged thermoacoustic refrigeration units on the left and right, wherein the thermoacoustic refrigeration unit includes a cold-end heat exchanger 3, a honeycomb ceramic 4 and a hot-end heat exchanger 5 connected in sequence, the hot-end heat exchanger 5 is connected to a resonance tube 6, and the two cold-end heat exchangers 3 are connected to a sound cavity 7; The acoustic cavity 7 is a cross-tube structure, with two cold-end heat exchangers 3 connected at both ends of the short cross-tube, containing heat exchange fins, and jet plates and acoustic drivers installed at both ends of the long cross-tube.

[0037] The acoustic driver uses a reciprocating piston 10, which is driven by a crank-connecting rod mechanism to generate sound waves with specific frequency and amplitude. Example 4

[0038] This embodiment provides a synthetic jet actuator based on the thermoacoustic cooling effect, comprising two symmetrically arranged thermoacoustic cooling units on the left and right, wherein the thermoacoustic cooling unit comprises a cold-end heat exchanger 3, a honeycomb ceramic 4 and a hot-end heat exchanger 5 connected in sequence, the hot-end heat exchanger 5 is connected to a resonance tube 6, and the two cold-end heat exchangers 3 are connected to an acoustic cavity 7; The acoustic cavity 7 is a cross-tube structure, with two cold-end heat exchangers 3 connected at both ends of the short cross-tube, containing heat exchange fins, and jet plates and acoustic drivers installed at both ends of the long cross-tube.

[0039] A porous heat exchange structure is arranged inside the acoustic cavity 7 along the axial direction of the acoustic cavity short tube. The porous heat exchange structure includes a heat exchange structure body. A plurality of pores are arranged on the heat exchange structure body along the axial direction of the acoustic cavity short tube. The porous heat exchange structure can be made of foam metal. On the one hand, the porous structure is in contact with the cold end heat exchanger to maintain a low temperature; at the same time, it exchanges heat with the oscillating fluid in the acoustic cavity long tube to reduce the temperature of the oscillating fluid in the acoustic cavity.

[0040] The above is a detailed description of the implementation mode of the present invention in conjunction with the accompanying drawings, but the above is only a preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A synthetic jet actuator based on thermoacoustic cooling effect, characterized in that: It comprises two symmetrically arranged thermoacoustic refrigeration units on the left and right, wherein the thermoacoustic refrigeration units comprise a cold-end heat exchanger (3), a honeycomb ceramic (4) and a hot-end heat exchanger (5) which are connected in sequence, the hot-end heat exchanger (5) being connected to a resonance tube (6), and the two cold-end heat exchangers (3) being both connected to an acoustic cavity (7); The acoustic cavity (7) is a cross-tube structure, with two ends of the short cross-tube (71) being connected to two cold-end heat exchangers (3) respectively, and a jet plate (1) and an acoustic driver being installed at both ends of the long cross-tube (72).

2. A synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: The jet plate (1) is arranged perpendicular to the axis of the short tube of the acoustic cavity (7), and a jet hole (11) is provided at the center of the jet plate (1).

3. A synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: Heat exchange fins (2) are arranged inside the acoustic cavity (7), and a plurality of heat exchange fins (2) are arranged in parallel along the axial direction of the acoustic cavity short tube. The heat exchange fins (2) are made of red copper, and adjacent heat exchange fins are arranged at equal intervals.

4. A synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: A porous heat exchange structure is arranged inside the acoustic cavity (7) along the axial direction of the acoustic cavity short tube, wherein the porous heat exchange structure comprises a heat exchange structure body, and a plurality of pores are arranged on the heat exchange structure body along the axial direction of the acoustic cavity short tube.

5. The synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: One side of the cold end heat exchanger (3) is in close contact with the honeycomb ceramic, and the other side is connected to the heat exchange fins (2); the cold end heat exchanger comprises a circular outer wall (31), and a plurality of parallel plate fins (32) are arranged inside the outer wall parallel to the central axis direction of the resonance tube.

6. The synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: The honeycomb ceramic (4) is made of alumina and has a plurality of square through holes inside, with a porosity of 0.

8.

7. The synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: One side of the hot end heat exchanger (5) is in close contact with the honeycomb ceramic (4), and the other side is connected to the resonance tube (6). The hot end heat exchanger comprises a circular outer wall (51), and a plate-fin structure is arranged inside the outer wall parallel to the central axis direction of the resonance tube. The plate-fin structure comprises two vertical plates (52) perpendicular to the axial direction of the outer wall, and a plurality of parallel plate-fins (53) are arranged between the two vertical plates and outside the vertical plates. A cooling water channel (54) is opened inside the two vertical plates (52), and a hole is opened on the outer wall (51) at a position corresponding to the cooling water channel.

8. The synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: The acoustic cavity (7) is a cross-tube structure made of aluminum alloy. The cross-tube structure includes pipes in four directions. The long tube on which the acoustic driver is installed is 60 mm long, and the long tube on which the jet plate is installed is 120 mm long.

9. The synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: The acoustic driver uses a loudspeaker (8), which is driven by a frequency sweeper to generate sound waves with specific frequency and amplitude.

10. The synthetic jet actuator based on thermoacoustic cooling effect according to claim 1, characterized in that: The acoustic driver uses a piezoelectric ceramic (9), and the piezoelectric ceramic (9) is driven by a signal transmitter and a power amplifier to generate sound waves of a specific frequency and amplitude; or The acoustic driver adopts a reciprocating piston (10), and the reciprocating piston (10) is driven by a crank-connecting rod mechanism to generate sound waves with specific frequency and amplitude.

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