不同形状的泵站封闭式进水池喇叭口水力性能模拟与验证

泵站封闭式进水池是泵站常用的进水建筑物,喇叭口距水泵叶轮室最近,其形状对水泵性能的影响最为敏感。基于定常不可压缩流体的控制方程和重整化群湍流模型应用SIMPLEC算法,定常模拟不同喇叭口形状的泵站封闭式进水池内水流流动。研究表明,喇叭口对叶轮的进水流态有重要的导流整流作用;过小的喇叭口会严重影响叶轮的进水流态,随着喇叭口逐渐增大,叶轮进口处的进水流态越好,水力损失越小;过大的喇叭口水力损失大,同时需加大池宽,增加了土建投资。喇叭口大小相同,口形1/4圆弧的喇叭口较口形为1/4椭圆的喇叭口,管内流速分布更均匀,流态越好,水力损失较小。计算结果与试验数据在设计工况点处吻合较好,相对误差仅为1.7%...

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Bibliographic Details
Published in农业工程学报 Vol. 32; no. 13; pp. 31 - 35
Main Author 蒋红樱 成立 颜红勤 夏臣智 崔阳
Format Journal Article
LanguageChinese
Published 江苏省水利工程科技咨询有限公司,南京,210029%扬州大学水利与能源动力工程学院,扬州,225009 2016
Subjects
叶轮
喇叭口
形状
数值方法
泵
进水池
叶轮
numerical methods
sump
impellers
shape
泵
喇叭口
bell-mouth
pumps
数值方法
进水池
形状
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2016.13.005

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Summary:泵站封闭式进水池是泵站常用的进水建筑物,喇叭口距水泵叶轮室最近,其形状对水泵性能的影响最为敏感。基于定常不可压缩流体的控制方程和重整化群湍流模型应用SIMPLEC算法,定常模拟不同喇叭口形状的泵站封闭式进水池内水流流动。研究表明,喇叭口对叶轮的进水流态有重要的导流整流作用;过小的喇叭口会严重影响叶轮的进水流态,随着喇叭口逐渐增大,叶轮进口处的进水流态越好,水力损失越小;过大的喇叭口水力损失大,同时需加大池宽,增加了土建投资。喇叭口大小相同,口形1/4圆弧的喇叭口较口形为1/4椭圆的喇叭口,管内流速分布更均匀,流态越好,水力损失较小。计算结果与试验数据在设计工况点处吻合较好,相对误差仅为1.7%,表明计算结果可靠。基于研究结果,推荐工程中喇叭口形状采用1/4圆弧,圆弧半径为叶轮直径的1/3~1/2倍。
Bibliography:11-2047/S
Closed-style pump sump is a kind of inlet structures of pump station. Bell-mouth, a part of axial-flow pump system, is used to adjust the velocity distribution on the inlet section of pump. The shape of bell-mouth is an important factor that can affect the hydraulic performance of pump system. In order to investigate the hydraulic performance of different shapes of bell-mouth,the three-dimensional fluid flow inside an axial-flow pumping system was simulated based on the Reynolds time-averaged Navier-Stokes equations, the RNG k-e turbulent flow model, the SIMPLEC algorithm and the law of the wall. The parameters values of closed-style pump sump were from literature including sump length, sump width, bottom clearance, back wall distance, and submergence depth. In order to exclude the possible influence from closed-style parameters, these parameters values were fixed based on design standard of sump. Seven schemes with different bell-mouth shapes were designed with that without bell-mouth as control（sch
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.13.005