Airframe Noise Reduction for a Wing-flap Configuration Using DBD Plasma Actuators

Paper in proceeding, 2019

Airframe is considered to be one of the primary noise sources during aircraft take off and landing maneuvers, causing disturbance to the people living vicinity to airports. With the increasing demand for air transportation, there is need to innovate new technologies to reduce airframe noise. High lift device noise, in particular the wing-flap noise, gives a considerable contribution to the total airframe noise levels. This paper investigates the noise from a simplified wing-flap configuration and possibility of reducing the noise with the use of a Dielectric Barrier Discharge (DBD) plasma actuator. A compressible SST k-to based Improved Delayed Detached Eddy Simulation (IDDES) has been used to simulate the unsteady flow field. The Ffowcs- Williams & Hawkings (FW-H) acoustic analogy has been used to predict the far field noise. The effects of plasma has been modeled as volumetric body force source, based on the Suzen and Huang model. Results indicate a noise reduction of about 2.5 dB at frequencies below 1 kHz, as electric potential increases to 20 kV.