A synthetic jet actuator based on thermoacoustic refrigeration effect

Abstract

The application discloses a synthetic jet actuator based on thermoacoustic refrigeration effect, comprising two symmetrical thermoacoustic refrigeration units arranged 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 with a resonance tube, and the two cold end heat exchangers are connected with a sound cavity in communication; the sound cavity is a cross pipe structure, the two ends of a cross pipe short pipe are connected with the two cold end heat exchangers respectively, and the two ends of a cross pipe long pipe are respectively provided with a jet plate and an acoustic driver. The synthetic jet actuator is combined with the thermoacoustic refrigeration unit, the thermoacoustic refrigeration effect is utilized to realize the function of continuously spraying low-temperature fluid of the synthetic jet actuator, the cooling effect of a high-temperature surface is enhanced, and the technical problem that the jet temperature is high and the cooling effect is poor after the long-time operation of the traditional synthetic jet actuator is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermoacoustic refrigeration and synthetic jet, and particularly to a synthetic jet actuator for reducing jet temperature by using the principle of thermoacoustic refrigeration. BACKGROUND

[0002] Synthetic jet is a kind of non-continuous jet generated by an actuator alternately blowing and sucking surrounding fluid. The actuator usually contains an acoustic driver and an acoustic cavity connected with the outside fluid through an orifice. The actuator alternately blows and sucks fluid during operation, and the blown fluid forms a vortex ring through shearing action and moves away from the orifice. Under certain conditions, it is not sucked back into the actuator. The significant feature of synthetic jet is that it only outputs momentum and has zero mass, hence the name zero mass jet. Compared with traditional continuous flow control technology, synthetic jet has the advantages of simple structure, light weight, low cost, easy maintenance and no need for additional gas supply, so it has attracted widespread attention.

[0003] The low-temperature jet generated by the synthetic jet actuator can be used to cool high-temperature surfaces by continuously breaking the thermal boundary layer of the high-temperature surface to carry away heat and reduce the temperature of the high-temperature surface. Synthetic jet cooling technology has the advantages of high cooling efficiency, no need for external fluid supply, compact structure, etc., and is widely used in electronic devices, aircraft engines, electric vehicle batteries and other fields. However, there are challenges in the practical application of synthetic jet cooling technology. For example, during long-term operation of the actuator, the fluid near the high-temperature surface outside the orifice is sucked 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 also generates 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. This 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 compression and expansion, forming a refrigeration cycle. A thermoacoustic refrigerator usually consists of a resonant 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 resonant tube. The regenerator has a porous structure and interacts with the oscillating gas, transferring heat from one end of the regenerator to the other end. The two ends of the regenerator are connected to the heat exchangers; if the high-temperature end heat exchanger is controlled at room temperature, the low-temperature end heat exchanger will be below room temperature, resulting in a refrigeration effect. Thermoacoustic refrigerators usually use air or inert gases as working gas and do not require any refrigerant, which 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 refrigeration technology with synthetic jet technology to reduce the temperature of synthetic jet and improve the cooling efficiency is a difficult problem. SUMMARY

[0005] The technical problems solved by the present application are that the temperature of fluid in the sound cavity of the existing synthetic jet exciter increases after long-time operation, the cooling efficiency is reduced, the thermoacoustic refrigeration technology can effectively reduce the temperature of fluid in the sound cavity without significantly changing the structure of the synthetic jet exciter, and how to combine the thermoacoustic refrigeration technology with the synthetic jet technology to improve the cooling effect of the synthetic jet.

[0006] The technical scheme adopted by the present application is as follows:

[0007] A synthetic jet exciter based on the thermoacoustic refrigeration effect comprises two symmetrical thermoacoustic refrigeration units arranged on the left and right, 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 with a resonant pipe, and the two cold end heat exchangers are both connected with a sound cavity.

[0008] The sound cavity is a cross pipe structure, the two ends of a cross pipe short pipe are connected with the two cold end heat exchangers respectively, and the two ends of a cross pipe long pipe are respectively installed with a jet plate and an acoustic driver.

[0009] The synthetic jet exciter based on the thermoacoustic refrigeration effect described above, the jet plate is arranged perpendicularly to the axis of the short pipe of the sound cavity, and a jet hole is formed in the center of the jet plate.

[0010] The synthetic jet exciter based on the thermoacoustic refrigeration effect described above is provided with heat exchange fins inside the sound cavity, a plurality of heat exchange fins are arranged in parallel along the axis direction of the sound cavity short pipe, the material of the heat exchange fins is red copper, and the adjacent heat exchange fins are arranged at equal intervals.

[0011] The synthetic jet exciter based on the thermoacoustic refrigeration effect described above is provided with a porous heat exchange structure inside the sound cavity along the axis direction of the sound cavity short pipe, the porous heat exchange structure comprises a heat exchange structure body, and a plurality of apertures are arranged on the heat exchange structure body along the axis direction of the sound cavity short pipe.

[0012] The synthetic jet exciter based on the thermoacoustic refrigeration effect described above, one side of the cold end heat exchanger is closely attached to the honeycomb ceramic, and the other side is connected with the heat exchange fins; the cold end heat exchanger comprises a circular outer wall, and a plurality of parallel plate fins are arranged inside the outer wall in parallel to the central axis direction of the resonant pipe.

[0013] The synthetic jet exciter based on the thermoacoustic refrigeration effect described above, the material of the honeycomb ceramic is alumina, a plurality of square through holes are formed in the inside, and the porosity is 0.8.

[0014] The synthetic jet exciter based on the thermoacoustic refrigeration effect, one side of the heat exchanger is close to the honeycomb ceramic, and the other side is connected to the resonant tube, the heat exchanger comprises a circular outer wall two, and a plate fin structure is arranged inside the outer wall in parallel to the central axis direction of the resonant tube, the plate fin structure comprises two vertical plates perpendicular to the axial direction of the outer wall, a plurality of parallel plate fins two are arranged between the two vertical plates and outside the vertical plates, a cooling water channel is formed along the inside of the two vertical plates, and holes are formed on the outer wall two at positions corresponding to the cooling water channel.

[0015] The synthetic jet exciter based on the thermoacoustic refrigeration effect, the acoustic cavity is a cross pipe structure, and the material is aluminum alloy, the cross pipe structure comprises four pipes in different directions, the length of the long pipe where the acoustic driver is installed is 60 mm, and the length of the long pipe where the jet plate is installed is 120 mm.

[0016] The synthetic jet exciter based on the thermoacoustic refrigeration effect, the acoustic driver adopts a loudspeaker, and the loudspeaker is driven by a frequency sweep instrument to generate acoustic waves of specific frequency and amplitude.

[0017] The synthetic jet exciter based on the thermoacoustic refrigeration effect, the acoustic driver adopts a piezoelectric ceramic, and the piezoelectric ceramic is driven by a signal transmitter and a power amplifier to generate acoustic waves of specific frequency and amplitude.

[0018] The synthetic jet exciter 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 acoustic waves of specific frequency and amplitude.

[0019] The synthetic jet exciter of the present application combines the traditional synthetic jet exciter with the thermoacoustic refrigeration unit, utilizes the thermoacoustic effect to realize refrigeration, and cools the fluid in the acoustic cavity of the synthetic jet exciter through the heat exchange fins, so that the jet plate can continuously spray low-temperature fluid to cool the high-temperature surface, solving the problem of high temperature of the fluid in the acoustic cavity of the traditional synthetic jet cooling technology after long time work, and providing a more reliable solution with higher cooling efficiency for the synthetic jet cooling technology.

[0020] The present application adds a thermoacoustic refrigeration unit to the traditional synthetic jet exciter, and the whole system does not have complex mechanical moving parts, is simple in structure, safe and reliable, and low in maintenance cost.

[0021] The acoustic driver of the present application can adopt various schemes: for high-power equipment, a rotary motor can be used to drive the piston to reciprocate to generate large-amplitude acoustic pressure fluctuations; and for small-power equipment, a loudspeaker or a piezoelectric ceramic can be used to generate small-amplitude acoustic pressure fluctuations. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1The overall structure of the synthetic jet actuator in Example 1 is shown in the schematic diagram.

[0023] Figure 2 The ZY plane cross-sectional view of the synthetic jet actuator in Example 1 is shown in the schematic diagram.

[0024] Figure 3 The XY plane cross-sectional view of the synthetic jet actuator in Example 1 is shown in the schematic diagram.

[0025] Figure 4 The structure of the jet plate in Example 1 is shown in the schematic diagram.

[0026] Figure 5 The structure of the heat exchange fin in Example 1 is shown in the schematic diagram.

[0027] Figure 6 The structure of the cold end heat exchanger in Example 1 is shown in the schematic diagram.

[0028] Figure 7 The structure of the honeycomb ceramic in Example 1 is shown in the schematic diagram.

[0029] Figure 8 The structure of the hot end heat exchanger in Example 1 is shown in the schematic diagram.

[0030] Figure 9 The structure of the resonant tube in Example 1 is shown in the schematic diagram.

[0031] Figure 10 The structure of the acoustic cavity in Example 1 is shown in the schematic diagram.

[0032] Figure 11 The overall structure of the synthetic jet actuator in Example 1 is shown in the schematic diagram.

[0033] Figure 12 The overall structure of the synthetic jet actuator in Example 2 is shown in the schematic diagram.

[0034] Figure 13 The overall structure of the synthetic jet actuator in Example 3 is shown in the schematic diagram.

[0035] The reference 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, resonant tube, 7, acoustic cavity, 71, short tube, 72, long tube, 8, loudspeaker, 9, piezoelectric ceramic, 10, reciprocating piston. DETAILED DESCRIPTION

[0036] The technical solutions of the present application are further described below in combination with the drawings and specific examples. Example 1

[0037] As shown in Figure 1,Figure 2 and Figure 3 As shown, this embodiment provides a synthetic jet exciter based on thermoacoustic cooling effect, including two symmetrically arranged thermoacoustic cooling units. Each 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 a resonant tube 6, and both cold end heat exchangers 3 are connected to a sound cavity 7.

[0038] The acoustic cavity 7 has a cross-shaped tube structure. The two ends of the short tube 71 are connected to two cold-end heat exchangers 3, and the two ends of the long tube 72 are respectively equipped with jet plates and acoustic actuators. The working fluid inside the acoustic cavity and resonant tube is gas, usually air.

[0039] like Figure 4 As shown, the jet plate 1 is arranged perpendicular to the axis of the short tube of the acoustic cavity 7. The jet plate 1 has a thickness of 10 mm and a diameter of 46 mm. A jet hole 11 with a diameter of 3 mm to 7 mm is opened in the center of the jet plate 1.

[0040] like Figure 5 As shown, heat exchange fins 2 are arranged inside the acoustic cavity 7. Multiple heat exchange fins 2 are arranged parallel to the axis of the short tube of the acoustic cavity. The heat exchange fins 2 are made of copper, and adjacent heat exchange fins are evenly spaced at 3 mm intervals. Each heat exchange fin is 60 mm long and 1 mm thick. The heat exchange fins 2 are in contact with the cold-end heat exchanger to maintain a low temperature, and simultaneously exchange heat with the oscillating fluid inside the long tube of the acoustic cavity, reducing the temperature of the oscillating fluid inside the acoustic cavity. The parallel plate structure of the heat exchange fins is relatively simple and easy to manufacture.

[0041] like Figure 6 As shown, the cold-end heat exchanger 3 is attached to the honeycomb ceramic on one side and connected to the heat exchange fins 2 on the other side. The cold-end heat exchanger includes a circular outer wall 31 with an axial length of 5 mm. Several parallel plates 32 are arranged inside the outer wall parallel to the central axis of the resonant tube. The plates 32 are 1 mm thick, spaced 1 mm apart, and 3 mm long along the axial direction. The parallel channels between the parallel plates 32 contain reciprocating oscillating fluid. One side of the parallel plates 32 is attached to the honeycomb ceramic, and the other side is connected to the heat exchange fins 2. Due to the thermoacoustic cooling effect, the honeycomb ceramic absorbs heat from the parallel plates 32 of the cold-end heat exchanger, reducing the temperature of the parallel plates 32, and consequently reducing the temperature of the heat exchange fins connected to the parallel plates 32.

[0042] like Figure 7 As shown, the honeycomb ceramic 4 is made of alumina, is 40 mm long, and has multiple square through holes inside. The square through holes are 1 mm × 1 mm in size and have a porosity of 0.8.

[0043] like Figure 8As shown, the hot end heat exchanger 5 is in close contact with the honeycomb ceramic 4 on one side and connected to the resonant tube 6 on the other side. The hot end heat exchanger includes a circular outer wall two 51, the outer wall two 51 has an axial length of 5 mm, and a plate fin structure is arranged inside the outer wall in parallel to the central axis direction of the resonant 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 two 53 are arranged between the two vertical plates and outside the vertical plates, the plate fin two has a thickness of 1 mm, a spacing of 1 mm, and an axial length of 3 mm. A cooling water channel 54 is formed along the inside of the two vertical plates 52, and a hole is formed on the outer wall two 51 at a position corresponding to the cooling water channel. The cooling water carries 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 end in contact with the cold end heat exchanger is at a temperature lower than room temperature.

[0044] As shown in Figure 9 The resonant 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.

[0045] As shown in Figure 10 The acoustic cavity 7 is a cross tube structure made of aluminum alloy, which includes four directional pipelines with an inner diameter of 46 mm and a wall thickness of 2 mm, and a long tube with a length of 60 mm installed with an acoustic driver and a long tube with a length of 120 mm installed with a jet plate.

[0046] The working process of the synthetic jet exciter based on the thermoacoustic refrigeration effect in this embodiment is as follows: the acoustic driver generates sound waves of a specific frequency and amplitude, and the gas working medium in the resonant tube and the acoustic cavity reciprocally oscillates under the action of the sound waves. In particular, the gas working medium in the honeycomb ceramic exchanges heat with the surrounding solid wall in the process of periodic compression and expansion, transfers heat from one end of the honeycomb ceramic to the other end, and generates a constant temperature difference between the two ends of the honeycomb ceramic. One end of the honeycomb ceramic is connected to the hot heat exchanger, and the hot end heat exchanger removes 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 the cold heat exchanger, and due to the thermoacoustic refrigeration 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 is lower than room temperature. The heat exchange fins connected to the cold end heat exchanger will also have a temperature lower than room temperature, so they can effectively cool the gas working medium in the acoustic cavity. The low-temperature gas working medium in the acoustic cavity impacts the high-temperature surface in the form of high-speed jet flow from the jet orifice on the jet plate under the action of the sound field, thereby reducing the temperature of the high-temperature surface.

[0047] As shown in Figure 11 In this embodiment, the acoustic driver uses a loudspeaker 8, which can be driven by a frequency sweeper to generate sound waves of a specific frequency and amplitude.

[0048] Under the action of an acoustic actuator, the gaseous working fluid inside the acoustic cavity and resonant tube oscillates periodically. The cold-end heat exchanger, honeycomb ceramic, and hot-end heat exchanger are sequentially and tightly connected, placed inside the resonant tube. The honeycomb ceramic interacts with the oscillating gas, producing a cooling effect and transferring heat from the cold-end heat exchanger to the hot-end heat exchanger. The hot-end heat exchanger maintains the ambient temperature through water cooling, while the cold-end heat exchanger's temperature is lower than the ambient temperature. Under the influence of the acoustic field, the oscillating gas inside the acoustic cavity is periodically drawn in and ejected through small holes in the jet plate. The drawn-in gas enters the acoustic cavity and exchanges heat with the heat exchange fins connected to the cold-end heat exchanger, reducing the gas temperature inside the acoustic cavity. The ejected gas impacts the high-temperature surface in the form of a high-speed jet, reducing the high-temperature surface temperature. This invention combines a synthetic jet exciter with a thermoacoustic cooling unit, utilizing the thermoacoustic cooling effect to achieve the function of continuously ejecting low-temperature fluid by the synthetic jet exciter, enhancing the cooling effect on high-temperature surfaces, and solving the technical problem of increased jet temperature and decreased cooling effect after long-term operation of traditional synthetic jet exciters. Example 2

[0049] like Figure 12 As shown, this embodiment provides a synthetic jet exciter based on thermoacoustic cooling effect, including: This embodiment provides a synthetic jet exciter based on thermoacoustic cooling effect, including two symmetrically arranged thermoacoustic cooling units, each thermoacoustic cooling unit including 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 resonant tube 6, and the two cold end heat exchangers 3 are connected to a sound cavity 7.

[0050] The acoustic cavity 7 has a cross-shaped tube structure. The two ends of the short tube are connected to two cold-end heat exchangers 3, which contain heat exchange fins. The two ends of the long tube are respectively equipped with jet plates and acoustic actuators.

[0051] The acoustic driver uses piezoelectric ceramic 9, which can be driven by a signal transmitter and a power amplifier to generate sound waves with specific frequencies and amplitudes. Example 3

[0052] like Figure 13 As shown, this embodiment provides a synthetic jet exciter based on thermoacoustic cooling effect, including two symmetrically arranged thermoacoustic cooling units. Each 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 a resonant tube 6, and the two cold end heat exchangers 3 are connected to a sound cavity 7.

[0053] The acoustic cavity 7 has a cross-shaped tube structure. The two ends of the short tube are connected to two cold-end heat exchangers 3, which contain heat exchange fins. The two ends of the long tube are respectively equipped with jet plates and acoustic actuators.

[0054] The acoustic driver adopts a reciprocating piston 10 driven by a crank connecting rod mechanism to generate acoustic waves of specific frequency and amplitude. Embodiment 4

[0055] The embodiment provides a synthetic jet exciter based on a thermoacoustic refrigeration effect, which comprises two symmetrical thermoacoustic refrigeration units arranged on the left and right, the thermoacoustic refrigeration 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 with a resonant tube 6, and the two cold end heat exchangers 3 are connected with an acoustic cavity 7.

[0056] The acoustic cavity 7 is a cross pipe structure, the two ends of a cross pipe short pipe are connected with the two cold end heat exchangers 3 respectively, the cross pipe short pipe contains heat exchange fins, and the two ends of a cross pipe long pipe are respectively provided with a jet plate and an acoustic driver.

[0057] A porous heat exchange structure is arranged in the acoustic cavity 7 along the axis direction of the acoustic cavity short pipe, the porous heat exchange structure comprises a heat exchange structure body, a plurality of pores are arranged on the heat exchange structure body along the axis direction of the acoustic cavity short pipe, the porous heat exchange structure can adopt a foamed metal, the porous structure is in contact with the cold end heat exchanger on one hand to keep low temperature, and is in heat exchange with the oscillating fluid in the acoustic cavity long pipe on the other hand to reduce the temperature of the oscillating fluid in the acoustic cavity.

[0058] The embodiment of the application is described in detail above in combination with the drawings, but the above description is only the preferred embodiment of the application, and it should be pointed out that, for ordinary skilled in the art, some improvements and modifications can be made without departing from the technical principles of the application, and these improvements and modifications should also be regarded as the protection scope of the application.

Claims

1. A synthetic jet exciter based on thermoacoustic cooling effect, characterized in that, It includes two symmetrically arranged thermoacoustic cooling units, each of which 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 resonant tube (6), and both cold end heat exchangers (3) are connected to a sound cavity (7). The acoustic cavity (7) is a cross tube structure. The two ends of the short tube (71) of the cross tube are connected to two cold end heat exchangers (3), and the two ends of the long tube (72) of the cross tube are respectively installed with jet plate (1) and acoustic driver. The jet plate (1) is set perpendicular to the short tube axis of the acoustic cavity (7), and a jet hole (11) is opened in the center of the jet plate (1).

2. The synthetic jet exciter based on thermoacoustic cooling effect according to claim 1, characterized in that, A heat exchange fin (2) is provided inside the acoustic cavity (7). Multiple heat exchange fins (2) are arranged parallel to each other along the axial direction of the short tube of the acoustic cavity. The heat exchange fins (2) are made of copper and are arranged at equal intervals between adjacent heat exchange fins.

3. A synthetic jet exciter based on thermoacoustic cooling effect according to claim 1, characterized in that, A porous heat exchange structure is provided inside the acoustic cavity (7) along the axial direction of the short tube of the acoustic cavity. The porous heat exchange structure includes a heat exchange structure body, and multiple pores are provided on the heat exchange structure body along the axial direction of the short tube of the acoustic cavity.

4. A synthetic jet exciter based on thermoacoustic cooling effect according to claim 1, characterized in that, The cold end heat exchanger (3) is attached to the honeycomb ceramic on one side and connected to the heat exchange fins (2) on the other side; the cold end heat exchanger includes a circular outer wall (31) and several parallel plates (32) are arranged inside the outer wall parallel to the central axis of the resonant tube.

5. A synthetic jet exciter based on thermoacoustic cooling effect according to claim 1, characterized in that, The honeycomb ceramic (4) is made of alumina and has multiple square through holes with a porosity of 0.

8.

6. A synthetic jet exciter based on thermoacoustic cooling effect according to claim 1, characterized in that, The hot end heat exchanger (5) is attached to the honeycomb ceramic (4) on one side and connected to the resonant tube (6) on the other side. The hot end heat exchanger includes a circular outer wall (51). The inner side of the outer wall is provided with a plate fin structure parallel to the central axis of the resonant tube. The plate fin structure includes two vertical plates (52) perpendicular to the axial direction of the outer wall. Several parallel plate fins (53) are provided between the two vertical plates and on the outside of the vertical plates. Cooling water channels (54) are opened inside the two vertical plates (52). Holes are opened on the outer wall (51) at the corresponding positions of the cooling water channels.

7. A synthetic jet exciter based on thermoacoustic cooling effect according to claim 1, characterized in that, The acoustic cavity (7) is a cross-shaped tube structure made of aluminum alloy. The cross-shaped 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.

8. A synthetic jet exciter based on thermoacoustic cooling effect according to claim 1, characterized in that, The acoustic driver employs a loudspeaker (8), which is driven by a sweep frequency generator to generate sound waves with specific frequencies and amplitudes.

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

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