环境风与列车交会耦合作用下磁浮列车横向气动性能

Lateral aerodynamic performances of maglev train when two trains meet with wind blowing

采用三维、可压、非定常N-S方程,用动网格技术实现列车与地面、环境风与列车之间的相对运动,对不同风速、风向环境风作用下,磁浮列车以430 km/h速度等速交会时列车横向气动性能进行数值分析。研究结果表明：当风向角为135°时,磁浮列车受到的交会压力波幅值最大;头车和尾车横向力在风向角分别为270°和225°时最大,分别为-172.5 kN和77.4 kN;头、尾车侧滚力矩均在风向角为90°时最大,分别为-226.7 kN·m和-203.7 kN·m;在90°风向角下,风速增大,列车受到的横向力和侧滚力矩增大,横向力近似与风速的0.8次方成正比,而侧滚力矩约与风速的1.3-1.5次方成正比。

Based on three dimensional and compressional models with unsteady N-S equation, the technology named ‘Dynamic Mesh＇ was adopted to carry out two kinds of movements： trains and floor, wind and trains. Numerical analysis was made on lateral aerodynamic performances when two maglev trains met at the constant speed of 430 km/h, and wind with various direction and speed is blew to them. The research results indicate that the amplitude of air crossing pressure pulse the maglev train feels is the biggest in 135° wind direction. When two trains meet at the speed of 430 kin/h, aerodynamic forces change with wind direction. The capsizal moments that the head and tail receive, are both the biggest at 90°, i.e., -226.7 kN·m and -203.7 kN·m respectively, but the biggest lateral force of head and tail separately appears, -172.5 and 77.4 kN under 270° and 225°. In 90° wind direction, the lateral force and capsizal moment increase with the increase of wind speed, proportional to the power of wind speed increase, about 0.8 and 1.3-1.5, respectively.