A Fast Approach for Predicting Aerodynamic Noise Sources of High-Speed Train Running in Tunnel

Deng Qin,Honglin Wang,Jiye Zhang,Jizhong Yang,Yao Jiang,Tian Li,Haiquan Bi

doi:10.32604/cmes.2022.018480

Abstract

The aerodynamic noise of high-speed trains passing through a tunnel has gradually become an important issue. Numerical approaches for predicting the aerodynamic noise sources of high-speed trains running in tunnels are the key to alleviating aerodynamic noise issues. In this paper, two typical numerical methods are used to calculate the aerodynamic noise of high-speed trains. These are the static method combined with non-reflective boundary conditions and the dynamic mesh method combined with adaptive mesh. The fluctuating pressure, flow field and aerodynamic noise source are numerically simulated using the above methods. The results show that the fluctuating pressure, flow field structure and noise source characteristics obtained using different methods, are basically consistent. Compared to the dynamic mesh method, the pressure, vortex size and noise source radiation intensity, obtained by the static method, are larger. The differences are in the tail car and its wake. The two calculation methods show that the spectral characteristics of the surface noise source are consistent. The maximum difference in the sound pressure level is 1.9 dBA. The static method is more efficient and more suitable for engineering applications.

Highlights

With the continuous development of high-speed railways, there are many operating environments for high-speed trains
The results show that the track form has a small impact on the internal noise of high-speed trains, while the tunnel has a greater impact on the internal noise
Two different numerical methods are used to obtain the flow around and aerodynamic noise source of a high-speed train running in a tunnel

Summary

Introduction

With the continuous development of high-speed railways, there are many operating environments for high-speed trains. Tunnels are one of the major routes of high-speed trains. When high-speed trains pass through tunnels, complex aerodynamic effects, along with noise problems will occur [1–3]. The sound generated by the high-speed train passing through a tunnel will create a large noise action by the multiple waves’ reflections and superposition. The noise in tunnels is much larger than that in the open air. An in depth study of the aerodynamic noise characteristics of high-speed trains passing through tunnels is of great importance for the reduction of aerodynamic noises

Methods

Results

Conclusion