Location of anemometer along Lanzhou-Xinjiang railway
来源期刊：中南大学学报(英文版)2014年第9期
论文作者：GAO Guang-jun(高广军) ZHANG Jie(张洁) XIONG Xiao-hui(熊小慧)
文章页码：3698 - 3704
Key words：anemometer location; wind barrier; detached eddy simulation; wind speed distribution
Abstract: Using structured mesh to discretize the calculation region, the wind velocity and pressure distribution in front of the wind barrier under different embankment heights are investigated based on the Detached Eddy Simulation (DES) with standard Spalart- Allmaras (SA) model. The Reynolds number is 4.0×105 in this calculation. The region is three-dimensional. Since the wind barrier and trains are almost invariable cross-sections, only 25 m along the track is modeled. The height of embankment ranges from 1 m to 5 m and the wind barrier is 3 m high. The results show that the wind speed changes obviously before the wind barrier on the horizontal plane, which is 4.5 m high above the track. The speed of wind reduces gradually while approaching the wind barrier. It reaches the minimum value at a distance about 5 m before the wind barrier, and increases dramatically afterwards. The speed of wind at this location is linear with the speed of far field. The train aerodynamic coefficients decrease sharply with the increment of the embankment height. And they take up the monotonicity. Meanwhile, when the height increases from 3 m to 5 m, they just change slightly. It is concluded that the optimum anemometer location is nearly 5 m in front of the wind barrier.
GAO Guang-jun(高广军), ZHANG Jie(张洁), XIONG Xiao-hui(熊小慧)
(1. Key Laboratory of Traffic Safety on Track of Ministry of Education (Central South University),
Changsha 410075, China
2. School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China)
Abstract:Using structured mesh to discretize the calculation region, the wind velocity and pressure distribution in front of the wind barrier under different embankment heights are investigated based on the Detached Eddy Simulation (DES) with standard Spalart- Allmaras (SA) model. The Reynolds number is 4.0×105 in this calculation. The region is three-dimensional. Since the wind barrier and trains are almost invariable cross-sections, only 25 m along the track is modeled. The height of embankment ranges from 1 m to 5 m and the wind barrier is 3 m high. The results show that the wind speed changes obviously before the wind barrier on the horizontal plane, which is 4.5 m high above the track. The speed of wind reduces gradually while approaching the wind barrier. It reaches the minimum value at a distance about 5 m before the wind barrier, and increases dramatically afterwards. The speed of wind at this location is linear with the speed of far field. The train aerodynamic coefficients decrease sharply with the increment of the embankment height. And they take up the monotonicity. Meanwhile, when the height increases from 3 m to 5 m, they just change slightly. It is concluded that the optimum anemometer location is nearly 5 m in front of the wind barrier.
Key words:anemometer location; wind barrier; detached eddy simulation; wind speed distribution
