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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
In order to provide a theoretical basis for the design of high-speed railway in our country, the characteristic line method is used to study the one-dimensional unsteady flow induced by high-speed train entering the tunnel. As an extension of the research work of Kage et al., The difference between non-isentropic flow and isentropic flow in a tunnel is mainly studied. The established governing equations include the wall friction term and the radial section work of the effective cross-section not considered in the Kage et al. Calculation. The treatment of the wall friction term adopts Woods et al. Method to obtain the calculation results that are in good agreement with the corresponding experimental data The numerical results show that the effect of sidewall work and wall friction will lead to a significant increase of pressure wave peak, which can not be ignored