CAE技术在汽轮机高温强度计算中的应用

为分析某百万千瓦超超临界汽轮机高压缸旋转部件在高温以及高离心力载荷下的强度状况,建立高压缸第一级动叶片的模型.根据蠕变试验数据,采用最小二乘法拟合幂蠕变方程中的各个参数,并详细介绍各参数的拟合、优化和验算过程;用CFD分析软件计算流体域内的对流传热系数并插值到有限元计算程序中,分析叶根倒角处危险区域的蠕变应力状况.数据验算结果表明,利用拟合数据计算得到的蠕变应力值与试验值比较接近,证明该方法可靠;CAE计算结果表明,叶根倒角处危险区域蠕变应力考核合格,并且有充足的安全裕量.

Application of CAE technology in high-temperature strength calculation of steam turbine

To analyze the strength of the high pressure cylinder rotating components of a million-kilowatt class ultra-super steam turbine under the high-temperature and high-centrifugal force conditions, the model of the first stage moving blades of a high pressure cylinder is established. According to the creep test data, the least squares method is used to fit each parameter of the power creep equation, and the process of the fitting, optimization and checking calculation of each parameter is detailed. The convection heat transfer coefficients in fluid domain are calculated by CFD analysis software and then interpolated into finite element computation program, and the creep stress in the dangerous area of root chamfer is analyzed. The checking computation results indicate that the creep stress obtained by data fitting calculation is closer to the test value and the fitting method is proved to be reliable. The CAE calculation results show that creep stress in the dangerous area of the root chamfer can meet the demands of the criteria with enough safety margin.