【摘要】 基于一维可压缩非定常不等熵流动模型、薄壁孔口出流模型以及广义黎曼变量特征线法,发展了单列车通过内置开孔隔墙隧道的压力波数值分析方法。与国外试验结果比较验证本文建立的计算方法的正确合理性基础上,通过对不同开孔率的计算得出采用过大的开孔率将导致一维流动模型计算时出现较大的数值振荡,分析了计算结果震荡可能的一维流动模型适用性的原因。同时,通过对隔墙中开孔和不开孔的模拟计算,得出隔墙开孔可较大幅度的减缓压力波,为今后研究和隧道内设置开孔隔墙提供了有益的启示。更多还原

【Abstract】 The perforated wall have great effect on pressure waves produced a high-speed train through a tunnel.In this paper the effect on perforated wall for pressure waves was calculated numerically by the method of characteristics based on the equations of one-dimensional unsteady compressible non-isentropic fluid flow.The numerical method was validated by experimental results of Netherlands NLR.The validating results show the numerical method in this paper can predicts effect on pressure waves produced by a high speed train passing a tunnel with perforated wall.It was proved that the perforate wall can alleviate pressure waves obviously in the paper.In the paper the effect of perforated-hole ratio on pressure waves are investigated.The more bigger perforated-hole ratio may result in oscillation about the pressure wave solution and the one-dimensional fluid flow model was incorrect for more bigger perforated area value.Although this,one-dimensional fluid flow model is effective for pressure wave investigation of tunnel with perforated wall because perforated area value are moderate in tunnel engineering.更多还原