Active flow control structure of supersonic inlet flow field based on hybrid synthetic jet

Abstract

The invention discloses an active flow control structure for a supersonic inlet flow field based on a mixed synthetic jet; it belongs to the field of hypersonic inlets, and comprises a synthetic jet vibrating diaphragm array unit, upstream and downstream synthetic jet generating channels and a pulse valve connecting module; the upstream synthetic jet enters the injection stroke, forms a vortex pair series by self-coupling, and linearly provides momentum, and the downstream synthetic jet is in the opposite suction stroke, and the return vortex system of the boundary layer is sucked into the downstream synthetic jet cavity, and the separation wall boundary layer is accelerated to reattach; as the upstream synthetic jet enters the suction stroke, the low-pressure fluid on the wall is sucked into the cavity to weaken the near-wall adverse pressure gradient, and at the same time, the downstream synthetic jet injects energy into the downstream boundary layer, and the pulse cut-off valve is periodically opened and closed to periodically connect the upstream and downstream synthetic jet generating channels, and the pulse jet formed under the induction of the pressure difference on both sides increases the fluid turbulence and velocity pulsation while weakening the influence of ballast on the working efficiency of the synthetic jet.

Description

Technical Field

[0001] The present invention belongs to the field of hypersonic inlets, and relates to a supersonic inlet flow field active flow control structure based on a mixed synthetic jet; specifically, it relates to a supersonic inlet flow field active control method based on a mixed synthetic jet. Background Art

[0002] The working characteristics of the supersonic inlet directly determine the overall performance of the ramjet. In order to overcome the problem of flow separation caused by the shock wave boundary layer interference-induced low-energy flow in the boundary layer, which leads to a decrease in the total pressure recovery coefficient, a decrease in inlet performance, or even failure to start, researchers have adopted a series of auxiliary flow control technology solutions such as variable geometry structure, vortex generators, bleed, and active excitation to improve the stability and performance of the supersonic inlet.

[0003] A Chinese patent (patent number: CN 117927381 A) discloses a wide-speed hypersonic inlet with a lip mask and a throat that are continuously adjustable in two stages, and a control method and a design method thereof. The inlet cleverly indirectly controls the throat area through a rotating arm and controls the capture area through a translational lip mask to achieve better starting performance and intake indicators; however, the disadvantage is that the geometric structure of the device is complex.

[0004] A Chinese patent (patent number: CN 110985208 B) discloses an inward-rotating inlet duct assembly based on a plasma vortex generator. This method promotes momentum exchange between the mainstream and the low-energy flow in the boundary layer through the flow vortex formed by the interaction between the plasma jet and the free flow, enhances the boundary layer's ability to resist adverse pressure gradients, and thus has a certain delay or suppression effect on the shock wave / boundary layer interference separation zone induced by the downstream inner compression surface; however, its disadvantage is that the vortex generator in this device is easily damaged.

[0005] A Chinese patent (CN 107091158 B) discloses a method for controlling low external resistance hypersonic inlet and shock wave boundary layer interference. The method arranges a two-dimensional bulge at the inlet entrance and arranges a local air release slit / hole array at the concave part of the windward surface and the leeward surface. By controlling the opening and closing of two air release sub-cavities under the bulge, the optimal control capability of boundary layer separation caused by the lip mask shock wave / boundary layer interference is achieved; however, the disadvantage is that the bulge in the device has poor effect in a wide speed range.

[0006] Due to the defects of traditional control methods (such as complex structure of variable geometry, easy damage of vortex generators, serious and potential loss of air loss in capturing flow, and poor effect of bulging in a wide speed range), the self-regulation ability is limited. In recent years, new control technology solutions such as particle delivery method with both relaxation effect and thermal protection advantages, synthetic jet with zero mass flow characteristics, and flexible wall with pressure oscillation have further improved the working performance of the propulsion system, but the above methods rarely involve the integration and compatibility of different technical solutions. Therefore, it is necessary to explore more auxiliary flow control technologies to improve the stability and performance of supersonic inlets. Summary of the invention

[0007] In view of the above problems, the purpose of the present invention is to propose an active flow control structure of a supersonic inlet flow field based on a mixed synthetic jet, which utilizes the periodic blowing and suction effect of a mixed jet formed by a synthetic jet induced by a vibrating diaphragm and a pulsed jet driven by a pressure difference to destroy the vortex system of the separation bag on the inlet surface and inhibit the separation of the boundary layer. The synthetic jet vibrating diaphragm injects vortex and energy into the wall boundary layer by changing the frequency and amplitude, and the pulsating jet realizes the pressure difference regulation of the upstream and downstream synthetic jet generation channels by changing the frequency, so as to efficiently control the intake efficiency of the supersonic inlet.

[0008] The technical solution of the present invention is: the active flow control structure of the supersonic inlet flow field based on the hybrid synthetic jet described in the present invention comprises a synthetic jet vibrating diaphragm array unit, an upstream synthetic jet generating pipeline, a downstream synthetic jet generating channel and a pulse valve connecting module;

[0009] The synthetic jet vibrating diaphragm array unit is arranged between the upstream synthetic jet generating pipe and the downstream synthetic jet generating channel, and its arrangement direction is parallel to the horizontal direction;

[0010] The pulse valve communication module is arranged between the upstream synthetic jet generation pipeline and the downstream synthetic jet generation pipeline, and together with the synthetic jet vibration diaphragm array unit, divides the fluid channel into the upstream synthetic jet generation pipeline and the downstream synthetic jet generation channel.

[0011] Furthermore, the upstream synthetic jet generating conduit and the downstream synthetic jet generating channel share the same synthetic jet vibration diaphragm array unit, and correspond to the front and back sides of the synthetic jet vibration diaphragm array unit respectively.

[0012] Furthermore, the synthetic jet vibration diaphragm array unit is composed of a single row or multiple rows of several independent vibration diaphragm units arranged in parallel, and a metal substrate is arranged on one side of the several independent vibration diaphragm units.

[0013] Furthermore, the independent vibrating diaphragm unit adopts electromagnetic or piezoelectric drive, and produces reciprocating motion under the action of electrical signals input at both ends, and is controlled by a signal generator and a power amplifier connected thereto (electrical signals are loaded through the signal generator and the power amplifier, and the electromagnetic or piezoelectric effect is used to make the diaphragm produce periodic reciprocating vibrations. The diaphragm excitation frequency and amplitude are actively adjusted according to the degree of separation of the wall boundary layer).

[0014] Furthermore, the upstream synthetic jet generation pipeline is a cavity with holes, which includes an upstream synthetic jet generation pipeline guide channel and an upstream synthetic jet hollow cavity with a synthetic jet vibration diaphragm array unit arranged at one end;

[0015] The downstream synthetic jet generation channel is also a cavity with holes, which includes a downstream synthetic jet generation pipeline guide channel and a downstream synthetic jet hollow cavity.

[0016] One end of the upstream synthetic jet hollow cavity and the downstream synthetic jet hollow cavity are both connected to the synthetic jet vibrating diaphragm array unit;

[0017] The upstream synthetic jet hollow cavity and the downstream synthetic jet hollow cavity are connected by a synthetic jet vibrating diaphragm unit at one end, the only gas inlet and outlet is sucked into or discharged from the cavity through the upstream synthetic jet guide channel, and the other walls are kept sealed from the outside, and the cavity is buried in the air inlet duct and does not exceed the size of the air inlet duct;

[0018] The upstream synthetic jet generating pipeline guide channel and the downstream synthetic jet generating pipeline guide channel are at a certain angle to the inlet duct wall. One end of the guide channel is connected to the inlet duct wall in a slit shape and is arranged near the upstream of the boundary layer separation and reattachment, and the other end is connected to the synthetic jet cavity.

[0019] Furthermore, one end of the upstream synthetic jet generation pipeline guide channel and the downstream synthetic jet generation pipeline guide channel is in a slit shape, connected to the wall of the installed air inlet duct, and arranged near the upstream of the boundary layer separation and attachment, and the other end is connected to the synthetic jet chamber;

[0020] The end of the upstream synthetic jet hollow cavity opposite to the downstream synthetic jet hollow cavity comprises another vibration surface of the synthetic jet vibration diaphragm array unit.

[0021] Furthermore, the pulse valve communication module includes a pulse valve core and a pulse valve actuating component connected to each other;

[0022] The pulse valve communication module connects or isolates the upstream synthetic jet generation pipeline and the downstream synthetic jet generation channel by periodically opening or closing the channel;

[0023] When the pulse valve connection module is opened, while the upstream synthetic jet generation pipeline and the downstream synthetic jet generation channel are connected, the pressure difference on both sides will drive the fluid on the low-pressure side to form a pulse jet in the pipeline;

[0024] When the pulse valve connection module is closed, the only gas inlet and outlet of the synthetic jet vibration diaphragm array unit is inhaled or discharged from the cavity through the slit outlet of the synthetic jet guide channel, and the other wall surfaces remain sealed from the outside world. The cavity is buried in the air inlet duct and does not exceed the size of the air inlet duct.

[0025] Furthermore, the synthetic jet vibrating diaphragm array unit is driven by electromagnetic or piezoelectric means.

[0026] Furthermore, both sides of the independent vibration diaphragm unit are arranged with vibration diaphragm connecting components and are arranged at equal intervals. The arrangement direction is parallel to the horizontal direction, and it is fixed to the metal substrate of the array by bonding or riveting through the vibration diaphragm connecting components.

[0027] Furthermore, the pulse valve connection module adopts electromagnetic drive or piston drive (piston or electromagnetic drive), which connects and separates the upstream synthetic jet generation pipeline and the downstream synthetic jet generation channel through periodic opening and closing; utilizes the pressure difference on both sides to induce the generation of pulse jets and increase the turbulence and velocity pulsation of the fluid in the channel, and the pulsating jet frequency is actively adjusted according to the degree of separation of the wall boundary layer and the effect of the synthetic jet.

[0028] The beneficial effects of the present invention are as follows: the mixed jet formed by the synthetic jet induced by the vibrating diaphragm and the pulse jet driven by the pressure difference has the characteristic of zero mass input, does not require external mass flow input, and has significant self-excitation characteristics; the pulse valve is opened and closed periodically, and the upstream and downstream generation channels are connected and separated, which effectively solves the ballast imbalance of the synthetic jets in the channels on both sides, and at the same time, the pressure difference on both sides is used to induce the generation of pulse jets to increase the turbulence and velocity pulsation of the fluid in the channel, thereby effectively improving the jet energy; when the synthetic jet diaphragm undergoes periodic reciprocating vibration, the vibration energy can be efficiently utilized, and the upstream and downstream channels on both sides can benefit, that is, when the diaphragm moves to one side, the volume of the hollow cavity on one side is reduced, and a high-energy vortex ring string is sprayed out of the channel, injecting high-energy fluid into the boundary layer; at the same time, the volume of the hollow cavity in the other channel is increased, and the low-energy boundary layer is sucked into the hollow cavity on the other side, and then When the synthetic jet diaphragm moves in the opposite direction, it transfers linear momentum to the absorbed low-energy fluid and discharges it with high energy through the slit nozzle; the synthetic jet vibrating diaphragm injects vortex and energy into the wall boundary layer by changing the frequency and amplitude, and the pulsating jet realizes the pressure difference regulation of the upstream and downstream synthetic jet generation channels by changing the frequency, which is beneficial to eliminate the influence of ballast and improve the working efficiency of the synthetic jet; the mixed synthetic jet device eliminates flow separation by absorbing the low-energy boundary layer and injects high-energy fluid into the boundary layer by intra-cavity excitation enhancement to suppress separation and improve the inlet performance, which is beneficial to improve the total pressure recovery coefficient; in summary, the present invention utilizes the mixed jet formed by the synthetic jet induced by the vibrating diaphragm and the pulse jet driven by the pressure difference to enhance the energy of the boundary layer of the hypersonic flow field, thereby effectively suppressing the flow separation, and has the advantages of low energy consumption, high efficiency, electric drive control, lightweight, low cost, easy maintenance and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the device of the present invention;

[0030] Figure 2 is a side view of the device of the present invention;

[0031] Figure 3 is a detailed diagram of the active control module in the present invention;

[0032] Figure 4 This is a basic principle diagram of the pulse valve module in the present invention using electromagnetic drive;

[0033] Figure 5 This is a basic principle diagram of the pulse valve module in the present invention being driven by a piston;

[0034] Figure 6 is a schematic diagram of a slit outlet assembly of the device of the present invention;

[0035] Figure 7 It is a schematic diagram of a synthetic jet vibrating diaphragm array unit assembly in the present invention;

[0036] Figure 8 It is a simplified diagram of the working principle of the present invention in which the upstream channel sucks and the downstream channel sprays;

[0037] Fig. 9 It is a simplified diagram of the working principle of the present invention in which the upstream channel sucks and the downstream channel sprays;

[0038] Fig.10 It is a simplified diagram of the working principle of the pulse valve when it is opened in the present invention;

[0039] In the figure: 1 is a synthetic jet vibrating diaphragm array unit, 11 is an independent vibrating diaphragm unit, 12 is a vibrating diaphragm connecting component, and 13 is a metal substrate;

[0040] 2 is an upstream synthetic jet generating pipeline, 21 is a flow guide channel of the upstream synthetic jet generating pipeline, and 22 is an upstream synthetic jet hollow cavity;

[0041] 3 is a downstream synthetic jet generation channel, 31 is a downstream synthetic jet generation pipeline guide channel, and 32 is a downstream synthetic jet hollow cavity;

[0042] 4 is a pulse valve communication module, 41 is a pulse valve core, and 44 is a pulse valve actuating component. DETAILED DESCRIPTION

[0043] The specific technical scheme of the present invention is further described in detail below with reference to specific examples.

[0044] As shown in the figure, the active flow control structure of the supersonic inlet flow field based on the hybrid synthetic jet of the present invention comprises a synthetic jet vibrating diaphragm array unit 1, an upstream synthetic jet generating pipeline 2, a downstream synthetic jet generating channel 3 and a pulse valve connecting module 4;

[0045] The synthetic jet vibration diaphragm array unit 1 is composed of a single row or multiple rows of several independent vibration diaphragm units 11 arranged in parallel; the synthetic jet vibration diaphragm array unit 1 is placed between the upstream synthetic jet generation pipeline 2 and the downstream synthetic jet generation channel 3, and its arrangement direction is parallel to the horizontal direction.

[0046] Furthermore, the independent vibration diaphragm unit 11 generates reciprocating motion under the action of electrical signals input from both ends, and is controlled by a signal generator and a power amplifier connected thereto.

[0047] Furthermore, the upstream synthetic jet generation pipeline 2 is a cavity with holes, including an upstream synthetic jet generation pipeline guide channel 21 and an upstream synthetic jet hollow cavity 22 with a synthetic jet vibration diaphragm array unit 1 installed at one end;

[0048] The downstream synthetic jet generating channel 3 is also a cavity with holes, including a downstream synthetic jet generating pipeline guide channel 31 and a downstream synthetic jet hollow cavity 32 .

[0049] Furthermore, one end of the hollow cavity includes another vibration surface of the synthetic jet vibration diaphragm array unit 1 .

[0050] Further, the upstream synthetic jet generation pipeline 2 and the downstream synthetic jet generation channel 3 share the same synthetic jet vibration diaphragm array unit 1, corresponding to the front and back sides of the synthetic jet vibration diaphragm array unit 1;

[0051] The pulse valve connecting module 4 includes a pulse valve core 41 and a pulse valve actuating component 42, which are arranged between the upstream synthetic jet generating pipeline 2 and the downstream synthetic jet generating channel 3. Together with the synthetic jet vibration diaphragm array unit 1, the fluid channel is divided into the upstream synthetic jet generating pipeline 2 and the downstream synthetic jet generating channel 3.

[0052] The pulse valve communication module 4 connects or isolates the upstream synthetic jet generation pipeline 2 and the downstream synthetic jet generation channel 3 by periodically opening or closing the channel.

[0053] Furthermore, when the pulse valve connection module 4 is opened, while the upstream synthetic jet generation pipeline 2 and the downstream synthetic jet generation channel 3 are connected, the pressure difference on both sides will drive the fluid on the low-pressure side to form a pulse jet in the pipeline; specifically, the synthetic jet vibrating diaphragm array unit 1 injects vorticity and energy into the wall boundary layer by changing the frequency and amplitude, and the pulsating jet realizes the pressure difference regulation of the upstream and downstream synthetic jet generation channels by changing the frequency, which is conducive to eliminating the influence of ballast and improving the working efficiency of the synthetic jet;

[0054] The hybrid synthetic jet device eliminates flow separation by absorbing the low-energy boundary layer and injects high-energy fluid into the boundary layer through intra-cavity excitation enhancement to suppress separation and improve the inlet performance, which is beneficial to the improvement of the total pressure recovery coefficient.

[0055] In the embodiment, the pulse valve communication module 4 is realized by electromagnetic drive or piston movement; it includes a pulse valve core 41 and a left electromagnetic drive device, the pulse valve core 41 is directly fixed on the moving iron core, and the fixed iron core at the other end is connected to the moving iron core through a spring;

[0056] The pulse valve actuating component 42 generates reciprocating motion under the electromagnetic effect of the peripheral coil current; it includes a pulse valve core 41 and a left crank-connecting rod mechanism, and the pulse valve core 41 generates reciprocating motion driven by the crank-connecting rod mechanism.

[0057] In the embodiment, the slit outlet of the upstream synthetic jet generating pipe guiding channel 21 and the slit outlet of the downstream synthetic jet generating pipe guiding channel 31 are arranged in parallel.

[0058] Furthermore, the upstream synthetic jet hollow cavity 22 and the downstream synthetic jet hollow cavity 22 adopt a parallelepiped structure.

[0059] In the embodiment, the synthetic jet vibrating diaphragm array unit 1 is driven by electromagnetic or piezoelectric means.

[0060] Furthermore, the electromagnetic drive is consistent with the basic principle of the electromagnetic drive in the pulse valve communication module 4.

[0061] Furthermore, in the piezoelectric driving mode, voltage is applied to the positive and negative electrodes of the piezoelectric ceramic diaphragm, so that the piezoelectric ceramic diaphragm vibrates under the piezoelectric effect.

[0062] In the embodiment, the synthetic jet vibration diaphragm array unit 1 includes an independent vibration diaphragm unit 11, a vibration diaphragm connecting component 12 and a metal substrate 13; preferably, vibration diaphragms are arranged on both sides of the synthetic jet vibration diaphragm array unit 1, with equal intervals, and the vibration diaphragm connecting component 12 is fixed to the array metal substrate by bonding or riveting.

[0063] In the embodiment, the synthetic jet vibration diaphragm array unit 1 can efficiently utilize vibration energy when it undergoes periodic reciprocating vibration, and both upstream and downstream channels on its two sides can benefit; when the synthetic jet vibration diaphragm array unit 1 is squeezed toward the side of the upstream synthetic jet hollow cavity 22, the volume of the upstream synthetic jet hollow cavity 22 is reduced.

[0064] Furthermore, under the action of shear, the fluid in the upstream synthetic jet hollow cavity 22 sprays a high-energy vortex ring series to the outside of the channel through the slit outlet of the upstream synthetic jet generating pipe guide channel 21, and injects high-energy fluid into the boundary layer; at the same time, the synthetic jet vibration diaphragm array unit 1 is squeezed toward the side of the upstream synthetic jet hollow cavity 22, which also corresponds to the expansion of the side of the downstream synthetic jet hollow cavity 32. The volume of the downstream synthetic jet hollow cavity 32 increases, and the low-energy boundary layer is sucked into the downstream synthetic jet hollow cavity 32 through the slit outlet of the downstream synthetic jet guide channel 31.

[0065] Furthermore, as the diaphragm reciprocates, when the synthetic jet vibration diaphragm array unit 1 moves in the opposite direction and squeezes toward the downstream synthetic jet hollow cavity 32, the vibration in the downstream synthetic jet hollow cavity 32 transfers linear momentum to the absorbed low-energy fluid, and is discharged through the slit outlet of the downstream synthetic jet generating pipe guide channel 31.

[0066] In the embodiment, when the pulse valve core 41 is in an open state, the originally separated upstream synthetic jet hollow cavity 22 and the downstream synthetic jet hollow cavity 32 are directly connected, and the pressure difference on both sides induces the generation of a pulse jet to increase the turbulence and velocity pulsation of the fluid in the channel, thereby effectively improving the jet energy.

[0067] Furthermore, the upstream synthetic jet generating channel 2 and the downstream synthetic jet generating channel 3 are ballast-balanced.

[0068] Furthermore, the synthetic jet vibrating diaphragm array unit 1 injects vorticity and energy into the wall boundary layer by changing the frequency and amplitude.

[0069] Furthermore, the pulse valve communication module 4 changes the frequency to generate pulse jets of different frequencies, and regulates the pressure difference between the upstream synthetic jet hollow cavity 22 and the downstream synthetic jet hollow cavity 32 to weaken the impact of ballast.

[0070] Furthermore, the working efficiency of the synthetic jet is improved. Specifically, the hybrid synthetic jet device eliminates flow separation by absorbing the low-energy boundary layer and injects high-energy fluid into the boundary layer to suppress separation and improve the inlet performance by strengthening the excitation in the cavity, which is conducive to improving the total pressure recovery coefficient.

[0071] Furthermore, the mixed jet formed by the synthetic jet induced by the vibrating diaphragm and the pulse jet driven by the pressure difference in the present invention has a zero mass input characteristic, does not require external mass flow input, and has a significant self-excitation characteristic.

Claims

1. The active flow control structure of supersonic inlet flow field based on hybrid synthetic jet is characterized by: The active flow control structure comprises a synthetic jet vibrating diaphragm array unit (1), an upstream synthetic jet generating pipeline (2), a downstream synthetic jet generating channel (3) and a pulse valve connecting module (4); The synthetic jet vibrating diaphragm array unit (1) is arranged between an upstream synthetic jet generating pipeline (2) and a downstream synthetic jet generating channel (3), and its arrangement direction is parallel to the horizontal direction; The pulse valve communication module (4) is arranged between the upstream synthetic jet generation pipeline (2) and the downstream synthetic jet generation pipeline (3) and on one side of the synthetic jet vibration membrane array unit (1), and together with the synthetic jet vibration membrane array unit (1) divides the fluid channel into the upstream synthetic jet generation pipeline (2) and the downstream synthetic jet generation channel (3); The upstream synthetic jet generation pipeline (2) and the downstream synthetic jet generation channel (3) share the same synthetic jet vibration diaphragm array unit (1), and correspond to the front and back sides of the synthetic jet vibration diaphragm array unit (1) respectively; The synthetic jet vibrating diaphragm array unit (1) is electromagnetically driven or piezoelectrically driven, and is composed of a single row or multiple rows of a plurality of independent vibrating diaphragm units (11) arranged in parallel, and a metal substrate (13) is arranged on one side of the plurality of independent vibrating diaphragm units (11); The independent vibration diaphragm unit (11) is driven by electromagnetic or piezoelectric means, and generates reciprocating motion under the action of electrical signals input at both ends, and is controlled by a signal generator and a power amplifier connected thereto; The pulse valve connection module (4) comprises a pulse valve core (41) and a pulse valve actuating component (42) which are connected to each other; the pulse valve connection module (4) connects or isolates the upstream synthetic jet generation pipeline (2) and the downstream synthetic jet generation channel (3) by periodically opening or closing the channel; the pulse valve connection module (4) is electromagnetically driven or piston driven; and connects and isolates the upstream synthetic jet generation pipeline (2) and the downstream synthetic jet generation channel (3) by periodically opening and closing.

2. The active flow control structure of supersonic inlet flow field based on hybrid synthetic jet according to claim 1, characterized in that: The upstream synthetic jet generation pipeline (2) is a cavity with a hole, comprising an upstream synthetic jet generation pipeline guide channel (21) and an upstream synthetic jet hollow chamber (22) with a synthetic jet vibration diaphragm array unit (1) arranged at one end; The downstream synthetic jet generation channel (3) is also a cavity with holes, which includes a downstream synthetic jet generation pipeline guide channel (31) and a downstream synthetic jet hollow cavity (32). One end of the upstream synthetic jet hollow cavity (22) and one end of the downstream synthetic jet hollow cavity (32) are both connected to the synthetic jet vibrating diaphragm array unit (1); One end of the upstream synthetic jet generation pipeline guide channel (21) and the downstream synthetic jet generation pipeline guide channel (31) are in the shape of a slit, connected to the wall surface of the installed air inlet duct, and arranged near the upstream of the boundary layer separation and attachment, and the other end is connected to the synthetic jet chamber; One end of the upstream synthetic jet hollow cavity (22) opposite to the downstream synthetic jet hollow cavity (32) comprises another vibration surface of the synthetic jet vibration diaphragm array unit (1).

3. The active flow control structure of supersonic inlet flow field based on hybrid synthetic jet according to claim 1, characterized in that: Both sides of the independent vibration diaphragm unit (11) are arranged with vibration diaphragm connection components (12) and are arranged at equal intervals, with the arrangement direction being parallel to the horizontal direction, and are fixed to the metal substrate (13) of the array by bonding or riveting the vibration diaphragm connection components (12).

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