Flow Around Wing Model with a Surface HF Discharge

Airflow around wing model W, controlled by pulse-repetitive HF discharge, is studied at flow velocities up to 100m/s, Pst~ 1 Bar and Re < 10 5 in this work. Transversal capacity coupled HF discharge (CHFD) with the typical frequency of f= 350 kHz is created on the model’s surface near its leading edge. It is revealed that there is drag decrease of the model W at high HF pulse power input in plasma and large attack angles (AoA). These results are sensitive to Strouchal’s number value. There are two drag minimums at the Sh~1 and the Sh~5. Mean power input in plasma doesn’t exceed 10 W/cm at the pulse HF power about of ~1 kW. Shadow pictures of the airflow around the wing model show a large-scale vortex creation near the separation line. There are acoustic waves (Fa~ 600 kHz) created by surface CHFD.