摘要
为溯源大型火电站循环泵顽固性振动原因,解决循环水泵振动问题,采用数值模拟方法研究水泵振动及水流道流场规律,提出了多种改善前池与吸水室不良流态的整流方案.采用雷诺时均N-S方程结合Realizable k-ε湍流模型,对原始工况和不同整流方案的水流流态进行Fluent三维数值模拟,分析并选择了合适的整流工程措施.模拟结果表明:弧形进水流道与矩形前池的不规范设计形成的高速水流区及贴壁偏流情况是造成循环泵振动的主要原因.为消除循环水泵的顽固性振动问题,在前池采用弧状均流板的整流措施后,整个前池、吸水室与喇叭口附近的流态均得到了较好的改善,前池高速水流区减少,吸水室贴壁偏流情况基本消失,喇叭口区域流态均匀,循环水泵进水条件优秀.现场试验证明:在实施整流措施后,明显消除了机组振动,提高了循环泵的运行效率.研究成果可为类似工程实例提供一定的理论指导和参考.
For solving the stubborn vibration problem of circulation pumps in large thermal power plants,numerical simulation methods were used to study the vibration of pumps.Multiple rectification schemes had been proposed to improve the bad flow pattern of the forebay and suction chamber.The Reynolds time averaged Navier-Stokes equations and Realizable k-εturbulence model were used to perform the numerical simulation.The 3D flow was simulated under the original working condition by Fluent.The flow pattern of different rectification schemes was also simulated by Fluent.Appropriate rectification engineering measures were analyzed and selected.The simulation results show that the irregular design of the arc-shape water inlet channel and the rectangular forebay are triggering the high-speed water flow areas and the adhering to the wall,which are the main reasons giving rise to vibrate in the circulation pump.To eliminate the stubborn vibration problem of the circulation pump,the rectification measures of the arc-shaped current sharing plate can nice improve the flow patterns around the entire forebay suction chamber and bell mouth.Meanwhile,the high-speed water flow area in the forebay is reduced by the rectification measures,the wall biased flow phenomenon basically disappears in the suction chamber,and the flow pattern is uniform in the bell mouth area.The inlet condition of the circulation pump is uniform.Field tests prove that the implement of rectification measures is efficacious,the vibration of pump units is obviously eliminated,the operating efficiency of the circulation pump has also been improved.The research results can provide certain theoretical guidance and reference for similar engineering examples.
作者
王为术
甄娟
郭嘉伟
翟禹鑫
贺友才
黄幸
WANG Weishu;ZHEN Juan;GUO Jiawei;ZHAI Yuxin;HE Youcai;HUANG Xing(School of Electric Power,North China University of Water Resources and Electric Power,Zhengzhou,Henan 450045,China;CSCEC SCIMEE Sci.&Tech.Co.,Ltd.,Chengdu,Sichuan 610045,China;Datang International Fuzhou Power Generation Co.,Ltd.,Fuzhou,Jiangxi 344000,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2023年第11期1119-1126,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
河南省高校科技创新团队支持计划资助项目(16IRTSYHN017)
河南省科技创新人才计划项目(154100510011)。
关键词
进水流道
水力特性
数值模拟
整流优化
循环泵振动
inlet flow channel
hydraulic characteristics
numerical simulation
rectification optimization
circulation pump vibration
