Numerical Analysis on Aerodynamic Noise of the High-speed Train Head

Along with the raising of the train speed,aerodynamic noise of the high-speed train are generated more and more significantly and their reduction has become one of the key factors to control noises of the high-speed train.In this paper,aerodynamic noise radiated from the high-speed train head surface are analyzed numerically.The mathematical and physical models of the three dimensional flow field of the high-speed train are established and the external steady and unsteady flow fields of the high-speed train are calculated by using the standard k-e turbulence model and large eddy simulation(LES) respectively.On the basis of the steady flow field,aerodynamic noise sources on the car body surface of the high-speed train are calculated by using the broadband noise source model.On the basis of the unsteady flow field,the time domain and frequency domain characteristics of fluctuating pressures on the car body surface are analyzed.The far-field aerodynamic noise of the high-speed train are calculated by applying the Lighthill acoustic analogue theory and the time domain and frequency domain characteristics of aerodynamic noise in the far-field are analyzed.The computational research is significant to study and control of aerodynamic noise of the high-speed train.