Study on Characteristics Noise Radiation of Civil Aircraft Engine
CHEN Ling1，XIA Yu 2，JI Liang 3
( 1. Shanghai Aircraft Design and Research Institute, Shanghai 200232, China; 2. Shanghai Institute of Spaceflight Control Technology, Shanghai 200233, China; 3. North Western Polytechnic Univesity, Xi’an, 710072, China ）
In order to study the engine noise radiation characteristics of civil aircraft on the cruise state, a similar transformation law was used in which the engine state parameter measured on ground work was transfered to one of the flight state. Analyzing two known aircraft engines, the engine noise pressure level changes corresponding to the ground test state and the air cruise state were investigated with different speed and the radiation angle, and the noise radiation field change rule of these two kind of state was obtained.