航空发动机飞越噪声预测优化算法研究  

Research on Optimization of Noise Prediction Method for Aero-engine during Take-off

作　　者：闫国华[1] 张敏[1] 刘勇 张青[1] Yan Guohua;Zhang Min;Liu Yong;Zhang Qing(Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学,天津300300

出　　处：《航空科学技术》2024年第8期21-28,共8页Aeronautical Science & Technology

基　　金：中国民航大学实验技术创新基金(2021CXJJ90)。

摘　　要：发动机风扇和喷气噪声是飞机起飞过程中发动机最主要的两个部件噪声源,在飞机起飞过程中,可以用发动机风扇噪声和喷气噪声近似替代发动机整机噪声进行噪声预测,这对新型发动机的降噪设计和民用航空器的噪声适航性评估具有重要意义。本文提出一种新的航空发动机整机飞越噪声预测方法,该方法基于Heidmann风扇噪声模型和Stone喷流噪声模型获取地面风扇噪声与喷气噪声数据,考虑噪声传播过程中多普勒效应、几何发散衰减、大气声吸收衰减的影响,将风扇噪声和喷气噪声分别映射到飞机起飞航迹线上,在飞行状态合成得到起飞航迹线上航空器噪声适航审定程序所要求的发动机整机噪声,计算实际飞机起飞时噪声适航审定中所需测量的每隔0.5s动态声压级的预测值,并计算最终的有效感觉噪声级。以CFM56-7B发动机为算例,将模型计算得到的有效感觉噪声级与试验结果进行对比,验证了该方法的有效性和准确性。本文方法可用于航空器适航噪声预测,为我国自主实现航空器噪声适航审定提供技术支持。Engine fan noise and jet noise are the two main noise sources of the engine during the take-off process of the aircraft.During the take-off process of the aircraft,the engine fan noise and jet noise can be used to approximately replace the engine noise for noise prediction,which is of great significance for the noise reduction design of the new engine and the noise airworthiness evaluation of the civil aircraft.A new method for predicting the take-off noise of aero-engine is proposed.Based on Heidmann fan noise model and Stone jet noise model,the data of ground fan noise and jet noise are obtained.Considering the influence of Doppler effect,geometric divergence attenuation and atmospheric sound absorption attenuation in the process of noise propagation,the fan noise and jet noise are mapped to the take-off track line respectively,and the engine noise required by the aircraft noise airworthiness certification program on the take-off track line is synthesized in the flight state.Taking the CFM56-7B engine as an example,the effective perceived noise level calculated by the model is compared with the experimental results to verify the effectiveness and accuracy of the method.This method can be used for aircraft airworthiness noise prediction and provide technical support for Chinese independent realization of aircraft noise airworthiness certification.

关 键 词：起飞 风扇噪声 喷气噪声 发动机整机噪声 噪声适航审定 

分 类 号：V235.1[航空宇航科学与技术—航空宇航推进理论与工程]