摘要
特低扬程泵站超扬程运行时,扬程增加比例大,长时间超扬程运行可能带来安全隐患。分析了轴流泵单叶片压力面压力分布情况,经理论计算和分析,确定了叶片根部截面为危险截面,给出了叶片轴向水推力、叶片阻力和叶片旋转离心力作用在叶片根部截面产生应力的理论计算方法,分析确定叶片根部断面进水边正面点为危险点,计算危险点的应力状态,给定最大应力的脉动范围;分别按最大工作应力不超过叶片材料许用应力、叶片工作安全系数不小于疲劳安全系数对危险点进行了安全校核。对苏州防洪工程4座泵站的4种型号水泵超扬程运行进行了叶片安全校核,结果表明,4种水泵叶片最大工作应力均小于许用应力,疲劳强度也都满足要求。
When the ultra-low head pump station is in the over-head operation condition,the proportion of head increases greatly,and the long-term over-head operation may bring potential safety hazards.The pressure distribution on pressure surface of axial flow pump blade was analyzed,the root of blade was considered as dangerous section through theory analyzing and calculating,the stress calculation method was given in this paper,which included three parts:axial hydraulic thrust of blade,centrifugal force at the connection between blade and hub,resistance of blade.The front point of inlet edge at the root of blade was analyzed as the dangerous point,and the stress of the point was calculated,the variation range of maximum stress was given.According to the maximum working stress shall not exceed the allowable stress and the working safety factor of blade shall not be less than the fatigue safety factor,the safety of dangerous point was checked.Taking four pump stations of Suzhou flood control project as examples,the security was corrected for four types of blade,the results showed that the maximum working stress of four types of blade were less than allowable stress.
作者
王慧洁
仇宝云
盛林华
罗梅
李玮华
WANG Huijie;QIU Baoyun;SHENG Linhua;LUO Mei;LI Weihua(College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou 225127,China;Suzhou River Course Administration Office,Suzhou 215004,China)
出处
《江苏水利》
2022年第6期26-31,共6页
Jiangsu Water Resources
基金
国家自然科学基金(52179091,51379182)
江苏省水利科技项目(2019019、2019017)。
关键词
特低扬程水泵
超扬程运行
叶片安全校核
最大工作应力
叶片疲劳强度
ultra-low head pump
over-head operation
safety check of pump blade
maximum working stress
fatigue strength of blade
