高速列车进入隧道时的一维非等熵流

为了给我国的高速铁路设计提供理论依据 ,采用特征线法对高速列车进入隧道引起的一维非定常流动进行了数值研究。作为 Kage等人研究工作的拓展 ,重点研究了隧道内非等熵流与等熵流间的差别。建立的控制方程中包含了壁面摩擦项和 Kage等人计算中没有考虑的有效截面侧壁径向做功项 ;壁面摩擦项的处理采用 Woods等类似的方法 ,得到与相应实验数据较为吻合的计算结果 ,数值计算结果表明侧壁做功和壁面摩擦的作用将导致压力波峰值的明显升高 ,是不可忽略的

One dimensional non-isentropic flow induced by high-speed train entering a tunnel

One dimensional unsteady flow induced by a high speed train entering a tunnel was numerically studied using the method of characteristics. The difference between isentropic and non isentropic flows was studied as a development of Kage's work. The governing equations not only contain the frictional terms similar to those of Woods, but also a term which includes the work done by the wall of an effective tube due to its motion in the radial direction. The numerical results, which agree well with experimental data, show that the effect of the work of the moving wall and the effect of friction are not negligible.