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喷气噪声是发动机主要噪声源之一,其大小直接影响到飞机的适航取证。由发动机静态噪声数据可以预测飞机飞行噪声级,提前了解飞机噪声的适航性,从而避免进行试验测量,达到节省时间和成本的目的。通过研究STONE喷气预测模型,提出民用航空涡扇发动机喷气噪声预测方法,并开发相应的Matlab预测程序。利用该程序预测C919客机主发的竞争发动机——CFM56-7B的喷气噪声,分析其噪声指向性以及频率特性,并与实验数据对比,验证此预测方法的准确性。
Jet noise is one of the main noise sources of the engine, its size directly affects the airworthiness certification of the aircraft. The static noise data of the engine can predict the aircraft flight noise level and understand the airworthiness of the aircraft noise in advance so as to avoid the experimental measurement and save the time and cost. Through the research of STONE jet prediction model, this paper puts forward the forecast method of jet noise of civil aviation turbofan engine, and develops the corresponding Matlab prediction program. The program is used to predict the jet noise of CFM56-7B, a competition engine of C919 passenger aircraft. The noise directivity and frequency characteristics are analyzed. Compared with the experimental data, the accuracy of this prediction method is verified.