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一、前言对于大容量、高参数汽轮机、部件中的热应力是限制机组起停和负荷变化速度的主要因素。研究起停、变负荷过程中,机组关键部件温度应力状态是开展起停技术、寿命管理、调峰运行方式等方面研究课题的基础。现在不少单位开展这些研究课题时,由于受条件限制,多采用解析法计算热应力,因而不得不把部件简化为无限长的实心园柱体、空心园筒、或平
I. Introduction For the large-capacity, high-parameter steam turbine, the thermal stress in the components is the main factor that limits the speed of unit starting and stopping and load changing. During the study of start-stop and change-load, the temperature stress state of the key components of the unit is the basis of the research topics in start-stop technology, life management and peak load operation mode. Now when many units carry out these research projects, due to the limited conditions, the analytical method is often used to calculate the thermal stress so that they have to be simplified into an infinitely long solid cylinder, a hollow cylinder, or a flat