簡易型4音源モデルによるジェット騒音の予測

概要

論文の詳細を見る
Jet mixing noise radiated from turbo-fan engines is dominant during take-off of civil aircraft. Simple and available empirical models to predict the jet mixing noise under several engine conditions are required for developing the suppressors of the jet mixing noise. To improve the accuracy of noise prediction, especially in coaxial jet configurations, a Four-Source concept has been applied in place of the former noise models such as SAE AIR1905. The Four-Source concept, allocating four types of noise sources behind the nozzle, is originally coupled with ESDU, the data base having difficulty in accessibility. This study thus proposes a simpler combination of the Four-Source concept with an available model, the SAE ARP876. The authors compared the proposed noise model with the experimental data. From the agreement of the noise model with the experimental data, it was confirmed that the proposed combination is practical in predicting jet mixing noise as well as the original model that is a Four-Source concept with ESDU.