Numerical study of the flow characteristics and active parameters for the sparkjet actuator

• 1、College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics

Abstract：The way of numerical simulation was discussed for the sparkjet actuator. Using the source term in energy equation to simulate the input energy for actuator is reasonable compared with the experimental data. The numerical results show that the processing of energy deposition, discharge, and recovery is obtained by the way of numerical. The instance energy input can produce the condition of high pressure and temperature in the actuator, which induce the forming of synthetic jet. Under the periodic action, the velocity of synthetic jet on the nozzle is stabilized on a non-sinusoidal law after three periodic times. The characteristic of short discharge time and long recovery time is different from the piezoelectric synthetic jet. The vortices pair at the downstream of nozzle with high intensity has an ability to roll environment air for flow control. Holding the input energy and actuator volume fixedness, the active frequency has no effect on jet velocity. But the recovery stage time shorten with the increase of active frequency. So, the choice of active frequency is under consider of the temperature resistance for actuator.

Keywords： sparkjet actuator synthetic jet flow control numerical simulation flow characteristic