MODELING METHOD OF ACOUSTIC SOURCE OF JET NOISE, ANALYSIS METHOD OF JET NOISE, AND DESIGN METHOD OF AIRCRAFT

摘要

PROBLEM TO BE SOLVED: To provide a modeling method of acoustic sources of jet noise and an analysis method of jet noise and a design method of aircraft therewith.;SOLUTION: An intensity distribution is determined from stationary RANS analysis for stream from jet engines and, following its discretization, each acoustic source intensity is obtained by setting a plurality of point acoustic sources. Furthermore. based on the noise level of observation points of far acoustic field utilizing existing databases, the phase of each point acoustic source is optimized and determined. Thus, an acoustic source model containing a plurality of point acoustic sources specified with the acoustic source intensity and the phase. By analyzing the acoustic field near stream of jet engine using the present acoustic source model, jet noise can be analyzed and, based on the analytical result, an aircraft is designed with an airframe capable of insulating noise.;COPYRIGHT: (C)2008,JPO&INPIT