超低比转速离心泵关阀启动瞬态特性分析

发布时间：2018-11-04 08:00

【摘要】：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。
[Abstract]:In order to investigate the start-up transient characteristics of the closed valve of ultralow specific speed centrifugal pump, this paper takes an ultra-low specific speed centrifugal pump with specific speed of 25 as the research object, and carries on the numerical simulation of the steady state and the start-up transient process of the valve under the closed dead point condition. Compared with the experimental results, the results show that the performance curve is the same as the experimental results under the closed dead point steady condition, and the maximum deviation is less than 5, which verifies the accuracy of the numerical simulation. At the end of starting process under different starting acceleration, there is an impact head in the starting process of shutoff valve. At the same rotational speed, the static pressure distribution, the relative velocity streamline distribution and the relative velocity distribution in the inlet pipeline are different from the transient distribution trends in the start-up process of the closed valve during the steady state process. The development of the internal flow field in the start-up transient process lags behind the internal flow field in the closed dead point steady-state process. The results can provide a reference for further study on the transient process characteristics of ultra-low specific speed centrifugal pump.
【作者单位】：江苏大学国家水泵及系统工程技术研究中心;西华大学流体及动力机械教育部重点实验室;
【基金】：江苏省产学研联合创新资金—前瞻性联合研究项目(BY2015064-10) 江苏省“六大人才高峰”高层次人才项目(GBZB-017) 江苏高校优势学科建设工程资助项目流体及动力机械教育部重点实验室(西华大学)开放课题(szjj2016-068)
【分类号】：TH311

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