文献类型：期刊文献

中文题名：深度调峰下汽轮机末级叶片涡激响应分析与安全性评价

英文题名：Analysis and safety evaluation of steam turbine last stage blade vortex-induced response under deep peak shaving conditions

作者：卞龙[1,2];范志飞[2];朱明亮[1];轩福贞[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]东方电气集团东方汽轮机有限公司,德阳618000

年份：2025

卷号：47

期号：9

起止页码：197

中文期刊名：机械强度

外文期刊名：Journal of Mechanical Strength

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金项目(52321002)。

语种：中文

中文关键词：汽轮机;末级叶片;流固耦合;典型运行工况;安全评估

外文关键词：Steam turbine;Last stage blade;Fluid-structure interaction;Typical operating condition;Safety assessment

摘要：为弥补新能源发电的间歇性,火电机组需长期低负荷运行,使汽轮机低压缸末级叶片持续处于小流量工况,导致叶片出现动应力增加与疲劳损伤等问题。为评估末级叶片的安全性,对某660 MW空冷汽轮机典型运行工况下低压缸末两级流道与末级动叶片进行流固耦合分析。结果表明,随着负荷的下降,末级动叶片的最大等效应力与变形先逐渐减小,后有所上升。末级动叶的最大等效应力始终低于叶片的屈服强度;叶片处于弹性变形阶段,未发生塑性变形。采用Goodman曲线分析方法对末级动叶的高周疲劳寿命进行评估,在Goodman曲线中,末级动叶片的动应力水平处于安全范围,表明叶片无疲劳损伤风险。
To compensate for the intermittency of renewable energy generation,coal-fired power units are required to operate under low-load conditions over a long time,which causes the last stage blades of steam turbine low-pressure cylinders under small flow conditions persistently,leading to increased dynamic stresses and fatigue damage in the blades.To evaluate the safety of these last-stage blades,the fluid-structure interaction analysis of the last two-stage flow path and last stage rotating blades were conducted for a 660 MW air-cooled steam turbine under typical operating conditions.The results demonstrate that as the load decreases,both the maximum equivalent stress and deformation of the last stage rotating blades gradually diminish first,then slightly increasing.The maximum equivalent stress of the last stage rotating blades remains consistently below the material’s yield strength,indicating that the blades are in the stage of elastic deformation and no plastic deformation has occurred.Using the Goodman curve analysis method for the high-cycle fatigue life assessment of the last stage rotating blades,the dynamic stress levels of the last stage rotating blades fall within the safe zone of the Goodman curve,indicating that there is no risk of fatigue damage to the blades.