| 气液两相下离心泵内部流动数值模拟 |
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| 引用本文： | 刘瑞华,李贵东,王洋.气液两相下离心泵内部流动数值模拟[J].排灌机械工程学报,2015,33(8):661-666. |
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| 作者姓名： | 刘瑞华 李贵东 王洋 |
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| 作者单位： | 1.中国能源建设集团江苏省电力建设第三工程有限公司, 江苏 镇江 212013; 2.江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江 212013 |
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| 摘 要： | 为了研究在气液两相条件下,离心泵运行过程中内部流动及压力变化情况,选取比转数为129的离心泵作为研究对象,建立整泵的流场模型,基于仿真模拟软件CFX提供的Eulerian-Eulerian非均相流模型对模型泵进行了非定常数值模拟,得到在不同气相体积分数下,蜗壳流道内所选监测点和监测面的压力脉动及气相体积分布情况,并将数值模拟的性能曲线与试验进行了对比.结果表明:蜗壳流道内气相体积主要分布在与叶轮前盖板同侧方向.不同监测点在不同含气量下的压力脉动主频都等于叶片的通过频率.随着气相体积分数的增加,监测点压力幅值随时间呈周期性变化的规律开始受到破坏,压力脉动频域开始出现一定的紊乱,在低频处出现了一系列的波动.叶轮流道内气相分布不均匀致使叶轮周围液体压力分布不均匀,导致叶轮所受的径向力逐渐减小,周期性受到破坏.
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| 关 键 词： | 离心泵 非定常流动 气液两相 压力脉动 径向力 |
| 收稿时间： | 2015-03-11 |
Internal flow numerical simulation of centrifugal pump under gas-liquid two-phase flow |
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| Liu Ruihua,Li Guidong,Wang Yang.Internal flow numerical simulation of centrifugal pump under gas-liquid two-phase flow[J].Journal of Drainage and Irrigation Machinery Engineering,2015,33(8):661-666. |
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| Authors: | Liu Ruihua Li Guidong Wang Yang |
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| Institution: | 1.Jiangsu Electric Power Construction No.3 Engineering Company, China Engineering Group Co. Ltd., Zhenjiang, Jiangsu 212013, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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| Abstract: | A centrifugal pump at a specific speed of 129 was chosen to study the internal flow and pressure changes in the running process of centrifugal pumps under gas-liquid two-phase conditions. The unsteady numerical simulation for the full flow field of the pump was processed by the Eulerian-Eulerian inhomogeneous flow model based on CFX simulation software. The pressure pulsation and the volume distribution of the gas phase on the selected monitoring points and surfaces in the volute flow channel under different gas-phase volume fraction conditions were obtained. Comparing the numerical simulation with experimental performance curves, the results show that the gas phase volume is distributed mainly in the ipsilateral direction of impeller front cover in the flow channel of the volute. The monitoring points have the pressure pulsation frequency equivalent to the passing frequency of the blade under different gas contents. With the gas phase volume fraction increasing, the law that the pressure amplitude of monitoring points cyclically changes with time begins to be destroyed, the pressure pulsation frequency domain has a certain disorder and a series of fluctuations appear at low frequency. The fluid pressure of impeller is unevenly distributed due to the inhomogeneous distribution of the gas phase, thus making radial force which the impeller suffered decreased and its periodicity damaged. |
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| Keywords: | centrifugal pump transient flow gas-liquid two-phase flow pressure fluctuation radial force |
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