兰州理工大学学报

2020, v.46;No.206(06) 43-51

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蜗壳出口位置对低比转速离心泵性能的影响
Influence of volute outlet position on performance of low specific speed centrifugal pump

赵伟国;李尚升;潘绪伟;王恒;
ZHAO Wei-guo;LI Shang-sheng;PAN Xu-wei;WANG Heng;College of Energy and Power Engineering,Lanzhou Univ. of Tech.;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou Univ. of Tech.;

摘要(Abstract):

为了研究蜗壳出口位置对低比转速离心泵性能的影响,在保证蜗壳基圆、前八断面面积及形状、蜗壳出口直径和中心高相同的前提下,改变蜗壳出口位置,分别设计出A、B、C三种型号蜗壳.以清水为介质,基于雷诺平均法、RNG k-ε湍流模型,对比转速为46的离心泵进行数值计算.结果表明:三种不同出口位置情形时离心泵的外特性变化趋势基本一致,但最高效率值有所不同,在各个工况点,C型的效率均高于A、B型,且三者的高效区均向大工况偏移;三种型号蜗壳的离心泵,在各自相应工况下,叶轮进口处的静压分布、湍动能分布和流线分布大致相同,而叶轮出口及蜗壳流道中三者的变化较大,表明改变蜗壳出口位置对叶轮进口处内流场的影响较小,主要影响叶轮出口及蜗壳流道中内流场的变化.
In order to study the influence of volute outlet position on the performance of a low specific speed centrifugal pump, the outlet position of the volute is adjusted on the premise of ensuring that the base circle of the volute, the area and shape of the first eight sections, the outlet diameter of the volute and the center height keep the same. Three types of volute A, B and C are designed respectively as a result. Based on Reynolds averaging method and RNG k-ε turbulence model, the numerical calculation of a centrifugal pump with a specific rotating speed of 46 is carried out by taking clear water as a medium. The results show that the change trend of external characteristics of the centrifugal pump is basically the same under three different outlet positions, but the highest efficiency is different from each other. At each operating condition, the efficiency of type C is higher than that of type A and B. The higher efficiency region for the three types tends to shift to heavy operating conditions. For the three types of volute centrifugal pumps, the static pressure distribution, turbulent kinetic energy distribution and streamline distribution at inlet of the impeller are roughly the same under their respective working conditions, while the three distributions in outlet of the impeller and flow passage of the volute vary greatly. It has been illustrated that changing outlet position of the volute has little effect on flow field at inlet of the impeller, but affects mainly the change of the flow field both at outlet of the impeller and in the volute channel.

关键词(KeyWords): 离心泵;蜗壳出口位置;低比转速;压力脉动;数值计算
centrifugal pump;volute outlet position;low specific speed;pressure fluctuation;numerical calculation

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基金项目(Foundation): 国家自然科学基金(51269011)

作者(Author): 赵伟国;李尚升;潘绪伟;王恒;
ZHAO Wei-guo;LI Shang-sheng;PAN Xu-wei;WANG Heng;College of Energy and Power Engineering,Lanzhou Univ. of Tech.;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou Univ. of Tech.;

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