深埋地道中空气-岩体动态换热计算模型

THE DYNAMIC MODEL FOR AIR-ROCK HEAT EXCHANGE INSIDE DEEP UNDERGROUND TUNNEL

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。

Underground tunnel is often used to cool or heat air for underground project. Air-rock heat exchange model is very important in applications. Single-variable model and semi-steady multi-variable model for air-rock heat exchange in underground turmel were introduced, and dynamical simulating model was developed. The dynamic model includes a 1-D sub-model of transient convection-diffusion for air and a 1-D sub-model of transient heat conduction for rock. The two sub-models were solved numerically. By arranging the discrete equations appropriately, the air model and the rock model could be solved sequentially. In ease of constant-rock-temperature and constant-inlet-air-temperature, numerical resolution fitted theoretical resolution very well. Comparisons of simulated data to field test data from Ertan power plant were conducted. The temperature error was within 1.4℃, and the error of relative humidity was within 10%. The results show that the revised dynamical simulating model is accurate.