UNSTEADY THERMAL STRESS MONITOR METHOD FOR STEAM TURBINE CASING
展开▼
机译:汽轮机壳非定常热应力监测方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
PURPOSE: To provide an unstable thermal stress monitor method enabling unstable thermal stress, applied to the casing of a steam turbine, to be obtained accurately including the unstable state at the start/stop operating time. ;CONSTITUTION: Temperature sensors 2 are installed at two different points on a space coordinate assumed in the wall of a turbine casing 1 to measure casing temperature, and the measured temperature is inputted into a computer 5. The surface temperature θi and volume average tempeature θm of the casing 1 are computed by a mathematical difference calculus on the basis of the detection value of each temperature sensor 2, and the computed temperature is introduced into an expression: σ=α.E.β(θi-θm)/1-ν [where α is a stress concentration factor, E is a Young' s modulus, β is the coefficient of thermal expansion and νis a Poisson's ratio] to compute unstable thermal stress σ applied to the casing 1.;COPYRIGHT: (C)1994,JPO&Japio
展开▼
机译:目的:提供一种不稳定的热应力监测方法,该方法能够准确地获得施加到汽轮机壳体上的不稳定的热应力,包括启动/停止运行时的不稳定状态。 ;组成:温度传感器2安装在涡轮机壳体1壁上假定的空间坐标上的两个不同点处,以测量壳体温度,并将测得的温度输入到计算机5中。表面温度θ i <基于每个温度传感器2的检测值,通过数学差分演算来计算壳体1的/ Sub>和体积平均温度θ m Sub>,并且将计算出的温度引入表达式中: σ=α.E.β(θ i Sub>-θ m Sub>)/1-ν[其中α是应力集中系数,E是杨氏模量,β是热膨胀系数,ν是泊松比],用于计算施加到套管1上的不稳定热应力σ。;版权:(C)1994,JPO&Japio
展开▼