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- Title
横风作用下高铁全封闭 矩形声屏障气动性能.
- Authors
黄永明; 何旭辉; 邓锷; 邹云峰
- Abstract
A number of important high-speed railway lines have been planned (some of them have been built) in coastal areas of China, and various types of fully enclosed rectangular noise barriers will be widely used along the high-speed railway lines in this area. In recent years, large typhoons generated in the western pacific frequently landed in this area, and the noise barrier structure of high-speed railway bridge in this area was frequently attacked by strong crosswinds. In order to provide theoretical basis for wind resistance design of fully enclosed noise barrier structure with moment form on high-speed railway bridge, a 3D fine CFD numerical simulation model of crosswind-train-bridge-noise barrier with the same size was established by referring to the dynamic model test device of train-noise barrier with scale ratio of 1:16.8. The large eddy simulation (LES) method was used to analyze the aerodynamic pressure and flow field structure of two fully enclosed barriers under crosswinds. Based on proper orthogonal decomposition (POD) theory, Matlab was used to decompose the flow field around the noise barrier with two forms under crosswinds. The contribution of each mode to its turbulent kinetic energy was discussed. The results are drawn. (1) The longitudinal distribution of turbulence intensity around the noise barrier with fully enclosed form is small at both ends and large in the middle. The turbulence intensity inside the noise barrier is higher than that outside the noise barrier, and the difference is most significant in the middle of the noise barrier. (2) Opening holes at the top of the inlet and outlet of the noise barrier will reduce the negative pressure inside the fully enclosed noise barrier by 82% and increase the turbulence intensity by 114%. (3) Compared with the fully enclosed barriers, the longitudinal area of the barrier with opening holes in the top of both ends is longer, and the corresponding turbulent modal composition is extremely complex; the fully enclosed barrier with opening holes in the top of both ends will lead to the intensified wind-induced vibration.
- Subjects
CHINA; NOISE barriers; LARGE eddy simulation models; PROPER orthogonal decomposition; HIGH speed trains; CROSSWINDS
- Publication
Journal of Railway Science & Engineering, 2023, Vol 20, Issue 1, p23
- ISSN
1672-7029
- Publication type
Article
- DOI
10.19713/j.cnki.43-1423/u.T20220264