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变螺距诱导轮对高速离心泵性能及流场的影响研究

ISSN号：1007-2284
期刊名称：中国农村水利水电
时间：0
页码：155-159
分类：TH311[机械工程—机械制造及自动化]
作者机构：[1]江苏大学流体中心,江苏镇江212013
相关基金：国家自然基金（50979034）; 江苏省高校自然科学研究项目（09KJB57001）
相关项目：离心泵基础理论和节能关键技术研究

关键词：变螺距诱导轮, 高速离心泵, 压力脉动, 数值模拟, 径向力, 汽蚀性能, 非定常流场计算, variable-pitch inducer, high-speed centrifugal pump, pressure fluctuation, numerical simulation, radial hydraulic force, cavitation performance, unsteady flow calculation

中文摘要：

为了定量研究诱导轮对高速离心泵内部流场和性能的影响,分别对有诱导轮和无诱导轮的高速离心泵进行三维非定常全流道数值模拟,并获得其压力脉动特性和作用在叶轮上的径向力分布。通过对比分析发现诱导轮产生的扬程提高了叶轮进口压力,从而提升泵的抗汽蚀性能并且能增大泵的扬程,但对效率有一定影响。模拟结果还表明,有、无诱导轮的高速离心泵内压力脉动均主要是由于叶轮和蜗壳动静干涉产生,且主频与叶频相一致,加装诱导轮对泵内的压力脉动频率分布影响较小,幅值在小流量下有所增大而设计流量和大流量下则有所降低。加装诱导轮之后,设计工况和小流量下叶轮受到的径向力的均值与最大值都比无诱导轮模型泵稍大,其中设计工况下均值和最大值分别增大15.13%和18.4%。

英文摘要：

In order to quantitatively study the influence of inducer on high-speed pump,numerical method was applied to simulate the flow of the high-speed centrifugal pumps with and without inducer.The pressure fluctuations on volute and radial hydraulic forces on impeller were obtained by numerical simulation of two pump models with and without inducer.By comparing the transient pressure distribution of impeller inlet of high-speed centrifugal pumps with and without inducer,the head produced by inducer increases the pressure of impeller inlet and increases the power of water in impeller,so the cavitation performance is improved and the head of pump is increased,but efficiency is affected.The analysis results show that the pressure fluctuation is produced by rotor-stator interaction between impeller and volute,and the main frequency of pressure fluctuation is consistent with blade-passing frequency.It would not influence the pressure fluctuation frequency while adding the inducer,but under design and high flow rate working conditions it will increase the pressure fluctuation amplitude.At the design and small flow rate conditions,the radial hydraulic force on impeller of pump with inducer is larger than that without inducer.Mean and maximum of radial force at design condition respectively increase by 15.13% and 18.4%.

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