Effect of heat transfer coefficient of steam turbine rotor on thermal stress field under off-design condition

作     者：Jie GUO Danmei XIE Hengliang ZHANG Wei JIANG Yan ZHOU 

作者机构：School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072 China 

出 版 物：《Frontiers in Energy》 (能源前沿（英文版）)

年 卷 期：2016年第10卷第1期

页      码：57-64页

摘      要：The precise calculation of temperature and thermal stress field of steam turbine rotor under off-design conditions is of paramount significance for safe and economic operation, in which an accurate calculation of heat transfer （HT） coefficient plays a decisive role. HT coefficient changes dramatically along with working conditions. First, a finite element analysis of rotor model, applied with ordinary rotor materials, has been conducted to investigate the temperature and thermal stress difference along with the change of HT coefficient from 20 W/（m2. ~C） to 20000 W/（m2. ~C）. Next, the differentia- tion between existing empirical formulas has been analyzed from the aspect of physical significance of non- dimension parameters. Finally, a verifying case of the cold startup of a 1000MW unit has been proceeded. The result shows that the accuracy of coefficient calculation when steam parameters are low has a greater influence on that of rotor temperature and thermal stress, which means a precise empirical HT coefficient formula, like the Sarkar formula is strongly recommended. When steam parameters are high and HT coefficient is larger than 104 W/（m2.℃）, there will be barely any influence on the calculation of thermal stress. This research plays a constructive role in the calculation and analysis of thermal stress.

主 题 词：steam turbine rotor thermal stress heat transfer coefficient empirical formula 

学科分类：080702[080702] 08[工学] 0807[工学-电子信息类] 

核心收录：

D　O　I：10.1007/s11708-015-0385-3

馆 藏 号：203997664...