Temperature field analysis of a cold-region railway tunnel considering mechanical and train-induced ventilation effects
Temperature field analysis of a cold-region railway tunnel considering mechanical and train-induced ventilation effects
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考虑机械通风和列车通风效应的寒区铁路隧道温度场分析
DOI：
10.1016/j.applthermaleng.2016.01.070
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发表时间：
2016-05
影响因子：
6.4
通讯作者：
Fan, Lei
中科院分区：
文献类型：
--
作者：
Zhou, Xiaohan;Zeng, Yanhua;Fan, Lei
根据寒区铁路隧道内传热与对流换热的非稳态有限差分方程，建立了隧道内空气与隧道壁之间的对流换热、隧道围岩中的换热以及隧道结构中不同材料之间的界面换热的非稳态有限差分计算模型。分析了某寒区铁路隧道入口处实际风温周期性变化情况下的温度场分布，考虑了运营过程中实际机械通风风的风速和风向以及隧道内列车诱导风和自然风的影响。计算的冻结长度和在铁路隧道入口处现场观测的冻结长度之间观察到良好的一致性。结果表明，运营期机械通风风和列车风对隧道内温度场分布有显著影响，在寒区隧道工程设计中应综合考虑机械通风风和列车风的影响。这样，通过有限差分法可以准确地预测铁路隧道的温度场。
In accordance with the unsteady-state finite-difference equations for heat transfer and heat convection in a cold-region railway tunnel, an unsteady-state finite-difference computer model was developed to study the heat convection between the air and the tunnel wall as well as the heat transfer in the surrounding rock and at interfaces between different materials in the structure of the tunnel. The wind speed and wind direction of actual mechanical ventilation wind produced during operation as well as the train-induced wind and natural wind in the tunnel were considered in the analysis of the temperature field distribution of a cold-region railway tunnel under actual periodic variations in entrance wind temperature. Good agreement was observed between the calculated frozen length and the frozen length observed in situ at the entrance of the railway tunnel. The results show that mechanical ventilation winds during operation and train-induced winds significantly influence the temperature field distribution in the tunnel and that the variables associated with mechanical ventilation winds and train-induced winds should be considered in the engineering design of cold-region tunnels. In this way, the temperature field of a railway tunnel can be correctly predicted via finite differencing.
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