管板结构轴对称简化模型的分析研究  

STUDY ON AXISYMMETRIC SIMPLIFIED MODEL OF TUBESHEET STRUCTURE

作　　者：李又香[1] 龚曙光[2] 庞心宇[2,3] 

机构地区：[1]湖南城建职业技术学院,湖南湘潭411101 [2]湘潭大学机械工程学院,湖南湘潭411105 [3]湖南食品药品职业学院,湖南长沙410208

出　　处：《机械强度》2013年第4期466-471,共6页Journal of Mechanical Strength

基　　金：湖南省教育厅资助项目(11C0236)~~

摘　　要：针对大型换热器管板结构建模复杂与求解困难等问题,根据支撑刚度相等的原理,采用一族等厚薄壁圆筒体来取代换热管对管板的支撑作用,结合多尺度均匀化方法,考虑管子壁厚对管板的加强作用,在此基础上提出了一种管板结构轴对称分析的简化模型即当量管板—壳单元模型,探讨了壳单元个数对轴对称模型计算精度的影响,并将轴对称模型的计算结果与实体模型进行了对比分析和应力评定,所得结果显示简化后的轴对称模型不仅能满足工程设计需要,且能有效地节省计算成本,因此所提出的简化模型能够为管板结构的应力分析设计提供理论参考。The axisymmetric simplified model of tubesheet structure,that is equivalent tubesheet and shell element model,is presented to deal with the problems that modeling is complicated and solving is difficult for tubesheet structure of large heat exchanger,in which a series of same thickness and thin wall cylinders are used to replace tube to tubesheet supporting role in according to the equal principle of support stiffness,and strengthening effect of pipe wall thickness is considered by combining with multi-scale homogenization method.The influence of the number of shell element on calculating accuracy of axisymmetric model was discussed.The computational results of axisymmetric model were compared with the one of solid model,and stress evaluation was carried out.The results obtained show that the simplified model presented can not only meet the requirement of engineering,and also effectively save computational cost.Thus,the proposed simplified model could provide a theoretical reference for design by stress of tubesheet structure.

关 键 词：换热器 管板 轴对称模型 实体模型 应力分析设计 

分 类 号：O241.82[理学—计算数学]