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