超低比转速离心泵关阀启动瞬态特性分析

为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果进行对比,研究表明：在关死点稳态工况下性能曲线与试验测得结果变化趋势相同,最大偏差小于5%,验证了数值模拟的准确性;关阀启动过程,不同启动加速度下启动过程的末期均出现一个冲击扬程;在相同转速时,稳态过程中间截面的静压分布、相对速度流线分布和进口管路内相对速度与关阀启动瞬态过程分布趋势存在差异。关阀启动瞬态过程内部流场的发展总体上滞后于关死点稳态过程内部流场。研究结果可为进一步研究超低比转速离心泵启动的瞬态过程特性提供参考。...

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Bibliographic Details
Published in农业工程学报 Vol. 33; no. 11; pp. 68 - 74
Main Author 王勇 陈杰 刘厚林 邵昌 张翔
Format Journal Article
LanguageChinese
Published 江苏大学国家水泵及系统工程技术研究中心,镇江,212013%西华大学流体及动力机械教育部重点实验室,成都,610039 2017
Subjects
关死点工况
瞬态特性
离心泵
稳态特性
计算机仿真
试验
关死点工况
steady characteristic
centrifugal pump
experiment
试验
离心泵
computer simulation
shut-off condition
transient characteristic
计算机仿真
稳态特性
瞬态特性
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.11.009

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Summary:为探究超低比转速离心泵关阀启动瞬态特性,该文以一台比转速为25的超低比转速离心泵为研究对象,在关死点工况下对稳态和关阀启动瞬态过程进行数值模拟,并与试验结果进行对比,研究表明：在关死点稳态工况下性能曲线与试验测得结果变化趋势相同,最大偏差小于5%,验证了数值模拟的准确性;关阀启动过程,不同启动加速度下启动过程的末期均出现一个冲击扬程;在相同转速时,稳态过程中间截面的静压分布、相对速度流线分布和进口管路内相对速度与关阀启动瞬态过程分布趋势存在差异。关阀启动瞬态过程内部流场的发展总体上滞后于关死点稳态过程内部流场。研究结果可为进一步研究超低比转速离心泵启动的瞬态过程特性提供参考。
Bibliography:11-2047/S
In order to explore the characteristics of the ultra-low specific-speed centrifugal pump during startup period under shut-off condition,an ultra-low specific-speed centrifugal pump with the specific-speed of 25 was chosen as the research object.Unsteady numerical calculation under shut-off condition and transient condition was conducted for the ultra-low specific-speed centrifugal pump.The accuracy of numerical simulation was verified by experimental contrast.Based on the numerical results,the influence of different starting acceleration on the transient impact head,the difference between steady state and transient impact head,and the internal flow field were analyzed.The results showed that：The variation tendency of performance curve on shut-off condition under steady state condition was similar with the experiment,and along with the increase of rotational speed,the head under shut-off condition increased gradually.When the start was completed,the transient head was 8.32%,6.13% and 4.19% higher than
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.11.009