汽轮机低压外缸强度分析中的自由度耦合方法  

Nodal DOF Coupling Method of Different Type Elements and Its Application in Strength and Buckling Analysis of Turbine LP Outer Casing

作　　者：汪勇[1] 杨宇[1] 邓志成[1] 史进渊[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《热力透平》2014年第1期50-55,共6页Thermal Turbine

基　　金：国家科技重大专项项目(2013ZX06005007);上海市科委基础研究重点资助项目(11JC404500);上海发电设备成套设计研究院青年创新基金项目(201106020Q);国家核电技术公司员工自主创新项目(SNP-KJ-CX-2014-14)

摘　　要：建立了实体单元、壳单元和梁单元三类单元节点自由度耦合计算模型,并通过与全实体模型的对比验证了计算的精确性。将节点自由度耦合方法应用于汽轮机低压外缸的强度和屈曲计算分析中,建立了两套包含实体单元、壳单元和梁单元三类单元的汽轮机低压外缸模型。经过计算,得到了额定负荷稳态工况下汽轮机低压外缸的位移场、应力场、屈曲放大系数以及屈曲模态。通过对比分析计算结果,验证了不同类型单元节点自由度耦合方法用于复杂结构强度计算中的正确性。The Nodal D0F coupling validating model of solid, shell and beam elements was built. The accuracy of this model was proved by comparing the results with full solid element model. Two discretized models of turbine LP outer casing were built by nodal DOF coupling method using different element types. Strength and buckling stability analysis of turbine LP outer casing was performed and the deformation and stress distribution of turbine LP outer casing were obtained. The results of two models demonstrate the accuracy of nodal DOF coupling method used in large complicate model.

关 键 词：有限元 低压外缸 强度分析 屈曲分析 

分 类 号：TK263.1[动力工程及工程热物理—动力机械及工程]