高速列车通过带有套衬结构隧道气动效应分析

Analysis on aerodynamic effect of high-speed train passing tunnel with lining structures

采用三维、可压缩、非定常N-S方程的数值计算方法,对8辆编组的高速列车以300 km/h速度通过带有套衬结构隧道时车体表面及隧道壁面的瞬变压力进行分析。研究结果表明:数值计算结果与动模型实验结果较吻合,2种方法得到的压力曲线变化规律一致,幅值误差在5%以内;列车通过隧道时,车体头、尾处测点压力差别较大,中部测点压力差异较小;沿列车车身方向,测点正压幅值逐渐减小,负压幅值逐渐增大;隧道壁面测点压力峰峰值在隧道进、出口附近较小,而在靠近隧道中部时较大;隧道内安装套衬对于高速铁路双线隧道气动效应影响很小,加装套衬前后,测点压力幅值差异在2%以内。因此,建议在对高速铁路隧道病害整治中,考虑使用套衬技术。

Based on unsteady N-S equation of three-dimensional and compressible viscous fluid, transient pressure of the train and tunnel was studied when an 8-car high-speed train passed a tunnel with lining structure at a speed of 300 km/h. The results show that the calculated results agree with those of the experimental model. The pressure curves attained by two methods are identical, and the difference of amplitudes is below 5%. The pressure changes of the measuring points in the head and end of the train are different, while those in the middle part of the train are almost the same. Along the direction of the body, the amplitude of positive pressure decreases gradually while the negative increases. The peak pressure values of measuring points around the inlet and the outlet on tunnel wall are less than those near the middle part of tunnel. Installing lining structure shows no significant effect on the aerodynamic effects of existing double-line tunnel, and the difference in maximum pressure values of measuring points is below 2%. Thus, the lining technology is proposed to be used in addressing the disease of high-speed railway tunnel.