Effects of Asymmetric Inflow on Near-Field Propeller Noise

摘要

The interior noise of jet aircraft can compete with luxury cars. Propeller drivenaircraft, however, generally suffer from an unpleasantly loud cabin noise. The aerodynamic and acoustic effects of non-axial inflow on wide-chord, advanced high speed propellers are studied by means of a lifting surface theory. Starting from the flow equations for a perturbed, axially subsonic flow, expressions are derived for the pressure and velocity field of a propeller. By using a Green's function representation in separated, cylindrical coordinates the boundary condition at the hub is naturally incorporated.