Numerical Simulation Of Nanosecond Pulse Plasma Actuator Properties And Flow Control Applications

In order to reveal the mechanism and evolution of nanosecond pulse discharge, this research usemulti-field coupling simulation method based on the physical principles to simulate the dischargecharacteristics of nanosecond pulsed plasma actuator. The research will provide a reference for theplasma flow control research.First, the plasma discharge theory is introduced, three basic theories that plasma act on flow arediscussed, and this part also introduces its application on the aeronautics. Then, the plasma simulationmethod-multi-field coupling simulation method based on physical principles is described in detail,also the mathematical model of plasma module and flow module is described here.Then, the numerical simulation of the discharge and aerodynamic characteristics of nanosecondsurface dielectric barrier discharge in quiescent air is realized to study the coupled physical effects ofthe plasma interacting with the quiescent flow. The accuracy of the numerical simulation model isverified in comparison with the experimental results. Moreover, the effect of the design parameters ofthe actuator and another three kinds of plasma actuator were studied. A computational study isperformed for Mach4.6air over a cylinder with a dielectric barrier discharge actuator set into thecylinder surface. Simulation results show that nanosecond discharge will lead to a heating spotlocating at the back end of upper electrode. The fast heating effect will result in a strong pressureperturbation and form an asymmetric perturbation wave spreading at the speed of sound. In the highspeed flow around cylinder, as the shock wave travels upstream, it interacts with the standingbow-shock and momentarily increases the bow-shock standing distance and weakens the shockstrength, thus resulting the drag decrease.Considering the effect of the energy transferring for air, the flow characteristics of nanosecondplasma synthetic jet actuator is simulated. It have shown that the effect of rapid heating lead to a sharpincrease in pressure inside the chamber. Therefore, high-pressure blast wave and high-speed jet isformed. Finally, the interaction between the NS-PSJ plasma actuator and the shock boundary layer issimulated. Research shows that NS-PSJ plasma actuator improving the separation phenomenon，weakening the intensity of the shock and reducing the angle of separation compression shock andreattachment compression shock, but efficiency needs further study.