Computational Aeroacoustic Analysis of a Wing-Tip Mounted Propeller and High-Lift Device

In the landing and takeoff phases of a propeller-driven aircraft, the interaction between the propeller slipstream, the wing and the high-lift devices plays a crucial role in the low-speed aerodynamic performance and noise signature of the aircraft. In particular, this interaction is intensified and the farfield noise directivity modified as the flap deflection is increased. This paper provides an in-depth investigation into this phenomenon by performing high-fidelity RANS simulations on the TU Delft PROWIM configuration in order to elucidate the key noise generation mechanisms. Both turbulent flow field around the configuration and farfield noise directivity are simulated over a range of flap deflections. The work illustrates that when the flap is deployed there is an increase in the overall sound pressure level of the wing-tip mounted propeller configuration of nearly 5 dB at certain observer angles in the fly-over plane.