Reduction in Airfoil Trailing-Edge Noise Using a Pulsed Laser as an Actuator

Trailing-edge noise (TE noise) is an aeroacoustic sound radiated from isolated airfoil in the specific ranges of low-speed flow. We used a pulsed laser as actuator to reduce TE without modifying airfoil’s surface. The wind tunnel test was conducted verify capability Nd:YAG actuator. beam focused into air just outside velocity boundary layer on lower side NACA0012 airfoil. experimental result shows that suppressed for certain period after irradiations. then analyzed physical mechanism reduction with actuation by implicit large eddy simulation (ILES), high-fidelity numerical method computational fluid dynamics (CFD). investigations indicate energy deposition changes unstable amplification mode layer, source acoustic feedback loop radiating noise, another does not generate noise. wave attenuation observed once induced fluctuations and consequently generated vortices sweep out flow structure mode. also examined effect irradiation zone’s shape simulations. results show larger zone, which introduces disturbances over wider range span direction, more effective reducing than shorter focusing length same energies.