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由于尺寸和实验成本所限,重型燃汽轮机周期性对称支承板机座的的可靠性分析主要依据可靠性仿真。热通道进口温度、进口流速和进口压力是影响燃气轮机切向支撑板机座的主要随机变量。文中运用有限元软件和蒙特卡洛法相结合的随机有限元法,随机产生120组左右的初始变量,以每一组变量为初始值对支承板机座进行流固耦合分析得到温度场分布,再进行稳态热分析得到热应力分布,提取每一组的最大应力值,并对最大应力的概率分布进行曲线拟合,得到最大应力的概率分布函数。根据应力—强度干涉模型,对切向支承机座极限热应力区域进行了可靠度计算,为大型燃气轮机的可靠性分析提供了参考。
Due to the size and experimental costs, the reliability analysis of the cyclical symmetrical support plate base of a heavy gas turbine is mainly based on the reliability simulation. Hot channel inlet temperature, inlet flow rate and inlet pressure are the main random variables affecting gas turbine tangential support plate base. In this paper, finite element method combined with Monte-Carlo method is used to randomly generate 120 initial variables. The temperature field distribution is obtained by fluid-solid coupling analysis of the support plate base with each group of variables as initial values. The steady-state thermal analysis was performed to obtain the thermal stress distribution, the maximum stress value of each group was extracted, and the probability distribution function of the maximum stress was obtained by curve fitting the maximum stress distribution. According to the stress-strength interference model, the reliability of the critical thermal stress region of the tangential support base is calculated, which provides a reference for the reliability analysis of large gas turbines.