Prediction of Fan Tone Radiation Scattered By A Cylindrical Fuselage

Abstract A theoretical prediction method of the scattering fan tone radiation from a turbofan inlet duct by airframe fuselage is presented. The noise modelled an acoustic disc source that represents sound field at termination. Adjacent to cylindrical scatters radiation. valid for upstream pressure on affected refraction as it propagates through boundary layer. This effect known layer shielding more prominent forward turbofan, since radiated propagating upstream. An asymptotic approach used model propagation which thin linear shear velocity profile. Consequently scattered can be computed very quickly, thus providing fast and efficient method. Although realistic turbulent does not resemble layer, shown taking liner profile with shape factor matches