无竖井单线隧道活塞风影响因素分析

采用非恒定流活塞风计算理论,按列车行驶在单线无竖井隧道中的不同位置,分四种情况(列车部分进入隧道,列车全部进入隧道,列车部分驶出隧道,列车全部驶出隧道后活塞风的衰减过程)建立了简化的活塞风分析数学模型.在此基础上,通过MATLAB软件进行数值求解,得到列车经过某区间隧道时的活塞风速度变化情况.分析了列车运行速度、列车长度、列车对隧道的阻塞比以及区间隧道长度对活塞风的影响.本方法可以作为列车以不同速度行驶在各种单线、无竖井隧道内活塞风速度的试用计算工具.

Influence Factors of the Piston Wind in Single Line Tunnel

According to the computing theory of the unsteady flow of piston wind,this paper sets up a simplified mathematic model for the piston wind, which is caused by the train running in different places of the tunnel (only parts of the train running in the tunnel; all parts of the train running in the tunnel; parts of the train already running out of the tunnel; all parts of the train running out of the tunnel). With the computing software MATLAB,the authors make a numerical evaluation of the velocity of the piston wind in an interzonal tunnel,analyze the influences of the train speed, the length of the tunnel, the length of the train and the blockage ratio to the piston wind.