核电机组孤岛运行汽轮机转子应力仿真分析  

Simulation analysis of rotor stress under island operation in nuclear power turbine

作　　者：陈旭[1] 岳亚楠[1] 姜伟[1] 石睿[1] 胡晓丹 谢诞梅[1] CHEN Xu;YUE Yanan;JIANG Wei;SHI Rui;HU Xiaodan;XIE Danmei(Hydraulic Machinery Transients Key Laboratory of Ministry of Education,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水力机械过渡过程教育部重点实验室,湖北武汉430072

出　　处：《热力发电》2022年第12期149-156,共8页Thermal Power Generation

基　　金：国家自然科学基金项目(51776142)。

摘　　要：核电机组孤岛运行能力对于核电机组安全性十分重要,对核电机组孤岛运行汽轮机转子应力仿真研究较少。基于MATLAB ANSYS软件,对某型核电机组100%PN和50%PN甩负荷至孤岛运行工况汽轮机转子应力进行仿真模拟,重点分析了2种孤岛运行工况下的转子转速飞升结果和对应最高转速下转子的离心应力场以及孤岛运行过程中转子的瞬态热应力。仿真结果表明:100%PN甩负荷至孤岛运行工况下,最大飞升转速达到1 574.78 r/min,最大离心应力达到168.09 MPa,最大离心应力出现位置为中压末级;热应力随时间逐渐增大,高压转子第二级级后叶轮根部出现最大应力值;最大应力值小于对应温度下转子材料的许用应力,2种孤岛运行工况是安全的。Nuclear power turbine island operation capability is very important for nuclear power units, but little research has been done on nuclear power turbine island operation simulation and rotor stress. In order to realize the analysis of rotor stress and simulation under island operation in nuclear power turbine, 100% PN and 50%PN load shedding to island operation conditions in a nuclear power turbine is simulated based on MATLAB and the rotor stress under both conditions is numerically simulated based on ANSYS, focusing on the simulation results of the speed rise, the centrifugal stress field of the rotor at the highest speed under both conditions and the transient thermal stress field of the rotor during the island operation. The results show that, under 100%PN load shedding to island operation condition, the maximum speed rise reaches 1 574.78 r/min and the maximum centrifugal stress reaches 168.09 MPa, which occurs at the end of the medium-pressure stage. The thermal stress increases gradually with time, and the maximum stress appears at the root of the turbine wheel after the second stage of the high pressure rotor. The maximum stress value is less than the permissible stress of the rotor material at the corresponding temperature, and the two island operation conditions are safe.

关 键 词：核电机组 孤岛运行 汽轮机转子 应力 仿真 

分 类 号：TK267[动力工程及工程热物理—动力机械及工程]