Vane Sweep Effects on Rotor/Stator Interaction Noise

摘要

The application of a lifting surface theory to compute the aerodynamic andacoustic response of swept vane stators to viscous rotor wakes is studied. Starting from the flow equations for a perturbed, axially subsonic flow, expressions are derived for the velocity field induced by a stator. A new representation of Green's function is used which avoids the traditional expansion in duct modes. This representation is more practical for arbitrary vane shapes than the classical one. The boundary condition at the vane surface yields an integral equation into a set of linear equations that is solved numerically. The method agrees with the classical method and experimental data for zero sweep. Sample calculations show that vane sweep can be exceptionally effective in the reduction of noise resulting from the interaction of rotor wakes and stator.