中南大学学报(英文版)
Journal of Central South University
| Vol. 27 No. 6 June 2020 |
（1. Key Laboratory of Traffic Safety on Track, Central South University, Ministry of Education,Changsha 410075, China;
2. Joint International Research Laboratory of Key Technologies for Rail Traffic Safety,
Changsha 410075, China;
3. National and Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Changsha 410075, China;
4. School of Automotive and Transportation Engineering, Hefei University of Technology,
Hefei 230009, China）
Abstract:This paper investigates the main scale analysis of the aerodynamic noise in the foremost bogie area by the large-eddy simulation (LES) and the Ffowcs Williams-Hawkings (FW-H) analogy. The mechanism of the aerodynamic noise in this area has been excavated. The aerodynamic excitation results show that the bogie divides the bogie compartment into two cavities, each of which contains a large circulating flow and presents multi-peak characteristics in the frequency domain. The far-field noise results suggest that in the speed range of 200-350 km/h, the aerodynamic noise mechanism in the bogie area is the same. Cavity noise is the main noise mechanism in the foremost bogie area, and the bogie divides the bogie cabin into two cavities, thereby changing the aerodynamic noise in this area.
Key words: large-eddy simulation; high-speed train; flow-field structure; aerodynamic noise; bogie
