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- Title
高速地铁隧道内运行气动特性分析.
- Authors
姚拴宝; 宋军浩; 陈大伟; 丁叁叁; 郑 静
- Abstract
Frequent start and stop are the characteristics of high-speed subway operations in the tunnel. In this article, the testing data from moving model test has been used to verify the correctness of value calculation method based on overset grid, analyze the impact of 4 different start/stop modes on aerodynamic effects of high-speed subway tunnel and make comparison against the working conditions under which the trains pass the tunnel at constant speed. The results indicated the start/stop mode has substantial impact on aerodynamic characteristics of trains passing the tunnel. The shorter the start acceleration is, the bigger the peak-peak value of pressure wave on carbody and the aerodynamic drag force is. Also, the closer the position of train start is to the tunnel entrance, the bigger the peak-peak value of pressure wave on carbody surface and the aerodynamic drag force is. However, the increment of aerodynamic drag force is smaller. Compared with tunnel passing at constant speeds, when the duration of acceleration and deceleration by train during start and stop within the tunnel is 5 s, both peak-peak value of pressure wave on carbody surface and the aerodynamic drag force have significant increase. Compared with 15 s as duration of acceleration, the peak-peak value of the pressure wave with acceleration of 5 s has increased by 20%. When the train stops in the center of tunnel, the pressure in the tunnel and on the surface of carbody is still varying. Also, the amplitude of the pressure within 30 s of the train stop basically remains unchanged. For high-speed subway trains with bigger blockage ratio, appropriate consideration shall be given to the impact of pressure wave on the comfort and safety of passengers on the train while stopping at the platform.
- Subjects
DRAG (Aerodynamics); AERODYNAMIC load; SUBWAY tunnels; DRAG force; PASSENGER trains; HIGH speed trains; SUBWAYS
- Publication
Rolling Stock (1002-7602), 2023, Vol 61, Issue 4, p66
- ISSN
1002-7602
- Publication type
Article
- DOI
10.3969/j.issn.1002-7602.2023.04.013