抽水蓄能电站顶盖螺栓应力分析
Stress Analysis on Bolts of Top Cover in Pumped Storage Power Station
徐亚鹏 1赵强 1王佳彬 1陆小康 2顾文彬2
作者信息
- 1. 国网新源控股有限抽水蓄能技术经济研究院,北京市 100053
- 2. 浙江仙居抽水蓄能有限公司,浙江省台州市 317312
- 折叠
摘要
抽水蓄能机组工况变化复杂,顶盖在运行过程中受到复杂的水推力作用,会使顶盖螺栓的应力发生变化,特别是在机组甩负荷过程中,螺栓的受力特性直接关系到机组的运行安全,因此,有必要全面了解顶盖螺栓在典型工况下的应力水平.本文利用电阻应变测量法,在抽水蓄能电站顶盖螺栓的中间截面布置应力测点,测试螺栓在预紧状态、甩50％负荷、甩100％负荷工况下的应力.结果表明,顶盖圆周方向上的螺栓受力不均匀,螺栓在安装后预紧存在损失的现象;机组甩负荷过程中,螺栓受到一定的弯曲载荷,在顶盖合缝面处的螺栓的应力幅值最高.
Abstract
The working conditions of pumped storage unit are complicated,and the stress on the bolts of the top cover will change when the top cover is subjected to complex water thrust during operation.Especially in the process of load rejectiong of the unit,the stress characteristics of the bolts are directly related to the operation safety of the unit.Therefore,it is necessary to fully understand the stress level of the bols of the top cover under typical working conditions.The stress measurement points were arranged in the middle section of the bolts of the top cover in pumped storage power station by means of resistance strain measurement method,and the stress of the boltd were measured under the condition of pretension,50％load rejection and 100％load rejection.The results showed that the stress of the bolts in the circumference direction of the head were not uniform,and there was a loss of the bolts in pre-tightening after installation.In the process of load rejection,the bolts were subjected to certain bending load,and the stress amplitude of the bolts at the joint surface of the top cover were the highest.
关键词
抽水蓄能/水泵水轮机/顶盖螺栓/预加载力/甩负荷/弯曲应力/疲劳Key words
pumped storage/pump turbine/bolts of top cover/preload force/load rejection/bending stress/fatigue引用本文复制引用
基金项目
国网新源集团有限公司科技项目(SGXYKJ-2022-045)
出版年
2024
NETL
NSTL
万方数据