汽轮机高压缸三维热弹性接触模型及其气密性分析

汽轮机高压缸中的高温和高压蒸气经常会造成缸体较大的变形，从而在汽缸法兰中分面产生漏气，为了分析汽缸的气密性，文中结合汽缸温度场和三维弹性接触理论，建立汽缸三维热弹性接触有限元模型。利用建立的模型完成一个100MW汽轮机高压缸的温度场及应力、变形计算，并且应用于实际的高压缸改造。实践表明这些计算结果可以作为汽缸设计的重要依据，从而提高运行中汽缸的安全可靠性。

NUMERICAL MODEL FOR 3-D THERMAL ELASTIC CONTACTANALYSIS AND ITS APPLICATION IN STEAMTIGHT ANALYSISOF HIGH PRESSURE CASING OF TURBINE

The high temperature and large pressure of inlet steam lead to large thermal stress and large thermal deformation in high pressure casing of turbine, it may lead to steamtight problem of the casing. Based on the temperature filed analysis and elastic contact theory, a three dimensional finite element model to analyze the deformation and stress of casing has been developed, some new methods to solve the elastic contact problem of the casing were also introduced. Then the high pressure casing of a 100?MW steam turbine is analyzed, some numerical results such as temperature distribution, stress and deformation are obtained. The analysis results is applied in a redesigned high pressure casing, the operation experience of the casing shows the numerical analysis can provide usable data for casing design and improve its reliability.