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基于复合单元法建立了裂隙岩体渗流-传热耦合的复合单元模型。该模型前处理简便快捷,网格剖分不受限制,可依据裂隙的真实信息自动将其离散在单元内。其次,采用交叉迭代算法,对裂隙岩体的渗流场和温度场进行耦合分析,耦合算法不仅考虑了温度对流体运动黏度的影响,而且可计算裂隙中流体与相邻岩块间渗流-传热过程以及两者间的渗流量和热量交换。通过与已有近似解析解相比较,验证了复合单元耦合算法的可靠性。算例分析表明,渗流-传热耦合作用对裂隙岩体的渗流场和温度场均有一定的影响。分析了不同岩块热传导系数和裂隙开度对热能提取效率的影响,结果显示,岩块热传导系数越大、裂隙开度越大,低温流体从高温岩块中吸取的热能会较多,出口处流体温度下降得较快。
Based on the composite element method, the composite element model of seepage and heat transfer in fractured rock mass is established. The pre-processing of the model is quick and easy, and the meshing is not restricted. It can be automatically dispersed in the cell according to the real information of the fracture. Secondly, the cross-iteration algorithm is used to analyze the seepage field and temperature field of the fractured rock mass. The coupling algorithm not only considers the effect of temperature on the kinematic viscosity of the fluid, but also calculates the seepage-heat transfer between the fluid in the fracture and the adjacent rock mass Process and seepage flow and heat exchange between the two. Compared with the existing approximate analytic solution, the reliability of the coupled algorithm of composite element is verified. The case study shows that seepage-heat transfer coupling has some influence on seepage and temperature fields of fractured rock masses. The results show that the larger the thermal conductivity of the rock mass is, the larger the fracture opening is, and the more the thermal energy is absorbed by the cryogenic fluid from the high temperature rock mass, and the outlet Fluid temperature drops faster.