Enhancement of aerodynamic performance of a wing model using an array of slotted synthetic jets

The present work deals with the improvement in aerodynamic performance of a wing model, NACA 0025, using an array of slotted synthetic jets. A new synthetic jet actuator was designed and located at 30% of the chord. Force balance and hot-wire measurements were carried out in a subsonic wind tunnel to assess the performance enhancement due to the operation of the synthetic jet array. Initially, the synthetic jet velocity was measured under quiescent flow condition at different actuation frequencies and input power. Actuation at 1000 Hz and 200 V resulted in the highest blowing velocity of 10.5 m/s. Experiments were performed at various actuation frequencies, namely, 200 HZ, 600 Hz and 1000 Hz. It was observed that, actuation at 1000 Hz led to increase in lift coefficient by 35.6% and reduction in drag coefficient by 33%. Subsequently, hot-wire measured power spectrum was computed from 40% to 80% of the chord. The power spectra showed successful stabilization of the flow field at the actuation of 1000 Hz.