摘要
针对火电灵活性运行背景下汽轮机热应力控制难题,创新性地采用降阶模型算法,结合有限元方法,高效模拟启动过程中汽缸的温度场、应力场和寿命损伤分布。该算法大幅降低了计算自由度,实现了在线应力评估,较传统方法计算效率提升约300倍,精度满足工程应用。通过Lemaitre损伤模型评估了汽缸疲劳-蠕变损伤,实时寿命损耗评估可为优化运行策略、提升机组灵活性与安全性提供科学依据。研究成果验证了降阶模型在复杂热力系统瞬态分析中的有效性,为汽轮机高温部件在线监测提供了新方法和思路。
Aimed at the challenge of thermal stress control of steam turbines with the background of flexible operation requirements for thermal power plants,the model order reduction algorithms was innovatively used in conjunction with finite element methods to efficiently simulate the temperature fields,stress fields and damage distribution during start-up process of cylinder.This algorithm could significantly reduce computational degrees of freedom,enabling online stress evaluation.With its computational efficiency approximately 300 times more than the conventional methods,this method could also satisfy the engineering applications.The fatigue-creep damage of the cylinder was evaluated by Lemaitre damage model,and the real-time damage assessment could provide scientific basis for optimization of operational strategies and enhancement of flexibility and safety of units.The research findings validated the effectiveness of the application of reduced order models in transient analysis of complex thermomechanical systems,providing new methods and ideas for online monitoring of high-temperature components in steam turbines.
作者
郝震震
冯磊
王炜哲
HAO Zhenzhen;FENG Lei;WANG Weizhe(Shanghai Electric Power Generation Equipment Co.,Ltd.Turbine Plant,Shanghai 200240,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《热力透平》
2024年第3期189-194,共6页
Thermal Turbine
关键词
汽轮机
有限元
降阶模型
特征正交分解法
疲劳蠕变损伤
steam turbine
finite element
reduced order model
proper orthogonal decomposition method
fatigue-creep damage
