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介绍了空气流经地下隧洞的单参数换热计算模型以及多参数准稳态模型,并改进了多参数动态计算模型。动态模型采用了空气一维非稳态解对流扩散子模型以及岩体一维非稳态导热子模型。两个子模型采用数值方法求解,通过离散格式的恰当选取,两个子模型可以顺序求解。在定壁温及稳态条件下,解析解和数值解几乎一致。用二滩电站实测数据进行了比较,温度误差在1.4℃以内,相对湿度误差在10%以内,说明该文模型整体上可靠准确。
The single-parameter heat transfer calculation model and the multi-parameter quasi-steady state model of air flowing through underground tunnel are introduced, and the multi-parameter dynamic calculation model is improved. The dynamic model uses a one-dimensional air-convection-diffusive sub-model of unsteady air flow and a one-dimensional unsteady thermal model of rock mass. The two sub-models are solved numerically, and by proper selection of discrete formats, the two sub-models can be solved sequentially. Under fixed wall temperature and steady-state conditions, analytical solutions and numerical solutions are almost the same. Compared with the measured data of Ertan Hydropower Station, the temperature error is within 1.4 ℃ and the relative humidity error is within 10%, which shows that the model is reliable and accurate as a whole.