【摘要】 在建造长大海底隧道时，为了加固隧道结构并节省成本，通常会改变隧道部分区段的截面面积，这将导致隧道内的空气动力学特性发生变化。本文通过对比变截面(VCS)隧道和常规(CCS)隧道，研究了突变截面对长隧道内压力瞬变和列车风的影响。数值模拟采用RNG k-ε湍流模型，通过动模型试验进行了验证。结果表明，越接近突变截面VCS隧道和CCS隧道内的正峰值压力之间的差异越大，在5.43 km处达到最大值7.63%。在两种隧道之间纵向列车风的差异最高达18.7%，但在其他两个方向上几乎相同。此外，突变截面对隧道不同区域的影响不相同。本研究对长大变截面隧道的参数设计和隧道内附属设施的布置具有参考价值。更多还原

【Abstract】 When constructing a long undersea tunnel, cross-sectional area of some parts of the tunnel will be changed to strengthen the tunnel or save construction costs, which will cause a change in aerodynamic characteristics of the tunnel.By comparing variable cross-section(VCS) tunnel and constant cross-section(CCS) tunnel, the influence of abrupt crosssection on pressure transients and slipstream in the long tunnel was studied. The RNG k-ε turbulence model was adopted for numerical simulation, which was validated by the moving model test. The results show that the closer it to the abrupt cross-section, the larger the difference between the positive peak pressure of the VCS tunnel and that of the CCS tunnel,reaching a maximum of 7.63% at 5.43 km. The difference in slipstream velocity in the longitudinal direction between the two tunnels can reach 18.7% at most, but it is almost the same in the other two directions. In addition, the impact of the abrupt section on slipstream in different areas of the tunnel is different. This research has an important reference value for parameter design of long variable cross-section tunnel and layout of auxiliary facilities in tunnel.更多还原