地下换热器结构热形变实验与数值模拟研究  

Experiment and Numerical Simulation Study of Thermal Deformation for Underground Heat Exchanger Structure

作　　者：朱晓林[1,2] 高青[1,2] 于鸣[3] 王有镗[1,2] 张天时[1,2] 

机构地区：[1]吉林大学模拟与控制国家重点实验室,吉林长春130025 [2]吉林大学热能工程系,吉林长春130025 [3]吉林大学材料科学与工程学院,吉林长春130025

出　　处：《应用基础与工程科学学报》2013年第4期756-766,共11页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(41072198)

摘　　要：针对地下换热器结构热形变开展数值模拟分析和实验研究,利用有限元法对竖直式换热管进行热应变和热形变数值计算,并结合实验验证数值方法的有效性.提出地下换热器结构的热形变、热应变计算方法,通过材料本构方程描述和几何模型建立,并着重研究具有初始弯曲形态换热管的热形变规律,以及对回填材料接触面的热挤压作用,得到了回填材料接触面特征边位移变化规律以及横断面上的塑性应变分布,为进一步探究回填材料接触面的热隙现象和分析换热衰减失效性奠定基础.Numerical calculation analysis and experimental study were carried out for the thermal deformation of unground heat exchanger structure. Finite element method was used in the study of thermal strain and deformation in underground heat exchanger with vertical heat exchange pipe, a series of experiments were used for verifying numerical method. By means of describing the material constitutive and building geometric model, a numerical calculation method for thermal deformation and thermal strain of underground heat exchanger structure was proposed The study focused on the thermal deformations of heat exchange pipes with different initial bending forms and thermal extrusion for the backfill material contact surface. The displacement characteristics of feature boundary in backfill material and the plastic strain distribution in the cross section were obtained. This fundamental study can be beneficial to the further study on thermal gap phenomenon of backfill material and heat transfer reduction of underground heat exchanger system.

关 键 词：地下换热器 热形变 热应变 数值计算 

分 类 号：TK523[动力工程及工程热物理—热能工程]