A supersonic mixing layer control method
A control method and supersonic technology, applied in the direction of mixers, fluid mixers, chemical instruments and methods, etc., can solve the problems of low operating frequency, low energy density, low mixing efficiency, etc., achieve small total pressure loss, improve Blending efficiency, effect of reducing total pressure loss
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Embodiment 1
[0062] Specifically, in this embodiment, a plasma synthetic jet actuator is used to generate a jet to apply disturbance to the supersonic mixing layer;
[0063] Such as figure 1 , two supersonic parallel airflows with velocities U1 and U2 meet behind the partition to form a supersonic mixing layer 4, such as figure 2 As shown, the plasma synthetic jet actuator array 710 is installed in the partition 1, the plasma synthetic jet actuator is arranged in the partition between two supersonic airflows, and the jet outlet of the plasma synthetic jet actuator is arranged at the The upper and lower surfaces; under the arrangement of the upper and lower surfaces, the jet outlet angle of the plasma synthetic jet actuator is perpendicular to the supersonic incoming flow direction; the jet outlet flow direction of the plasma synthetic jet actuator is 10mm away from the tail end of the partition. The jet outlets of the plasma synthetic jet actuator are distributed spanwise, and the distan...
Embodiment 2
[0068] The difference from Embodiment 1 is that the jet outlet of the plasma synthetic jet actuator array 720 is arranged at the rear end of the partition, and the direction of the jet outlet is parallel to the direction of the incoming flow. The distance between the two jet outlets is 20mm, such as image 3 shown.
[0069] The plasma synthetic jet actuator array 720 acts on the velocity inflection point of the mixed layer through the high-speed ejected jet, causing the supersonic mixed layer to destabilize rapidly, so that the supersonic mixed layer 4 generates a larger-scale vortex structure within a shorter distance, realizing The mixed layer space growth rate increases.
[0070] Such as Figure 8 As shown, when the plasma synthetic jet actuator array 720 starts to work for 450 μs, a larger-scale vortex structure appears in a shorter distance and the thickness of the mixing layer increases significantly, indicating that the purpose of improving the mixing efficiency is ac...
Embodiment 3
[0072] The difference from Embodiment 1 or 2 is that the plasma synthetic jet exciter array 730 is also set on the wall at the flow direction position of the supersonic mixed layer transition (about 50 mm from the flow direction distance from the tail end of the partition). After the actuator array 710 (or 720) works, a large-scale vortex structure is generated. After a delay of 100 μs, the plasma synthetic jet actuator 730 is turned on, and interacts with the supersonic airflow 602 to generate a shock wave 8, which interacts with the supersonic mixing layer 4. The vortex structure in the supersonic mixing layer 4 is quickly broken into smaller-scale vortices, thereby making the supersonic mixing layer 4 more uniformly mixed.
[0073] As a preferred solution, on the basis of Example 3, multiple plasma synthetic jet actuators can also be arranged along the flow direction. When the incoming flow condition changes, the transition position of the mixed layer also changes. At this t...
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