Tonal and Broadband Noise Calculations for Aeroacoustic Optimization of a Pusher Propeller

摘要: A multidisciplinary analysis and optimization is carried out for a propeller in real pusher aircraft configuration with the goal of reducing radiated noise power levels, while preserving aerodynamic efficiency. The process involves shape blade position engine exhaust ducts. coupling unsteady structural-dynamic models provides aeroelastic model that drives tonal broadband aeroacoustic prediction. results from periodic flow unsteadiness due to nonaxial flight impingement exhausts on disk. mainly interaction between leading edge turbulence. It shown overwhelmsthebroadbandnoiseandthattheoptimizationaffectstheshapeofthebladeatthetipandinthespanwise segment hit by exhausts. An overall sound pressure level reduction 3.5 dB achieved at takeoff condition, design thrust resulting small penalty efficiency cruise.