| 泵自吸过程的数值计算与可视化试验研究 |
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| 引用本文： | 陆天桥,李红,詹连辰.泵自吸过程的数值计算与可视化试验研究[J].排灌机械工程学报,2016,34(11):927-933. |
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| 作者姓名： | 陆天桥 李红 詹连辰 |
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| 作者单位： | 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： | 采用欧拉多相流模型、标准k-ε湍流模型及结合滑移网格技术并加载试验所得的叶轮转速变化曲线和出口压力变化曲线对65ZB-40C型外混式自吸泵自吸过程的气液两相流进行数值模拟,在叶轮进口、蜗壳各断面、气液分离室进口、回流孔上设置监测面,分析各监测面气体体积分数、气液相速度、混合相压力等参数的变化.采用高速摄影技术对自吸泵的叶轮、蜗壳、气液分离室及蜗壳出口段进行自吸过程的拍摄,把得到的图像与模拟结果进行对比.结果表明:自吸泵自吸过程中气液两相流态的微观变化与试验仪器监测到的压力、流量、转速等宏观变化具有一致性;自吸稳定过程占自吸时间的比例最大,对自吸性能的影响最大;气液分离室中心区域的气相空穴有利于蜗壳出口段的移动气泡的形成,有助于泵体内气体稳定地排出;自吸中期是一个动态稳定过程,进出口压力周期性地波动.
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| 关 键 词： | 自吸泵 自吸过程 气液两相流 数值模拟 高速摄影 |
| 收稿时间： | 2015-12-14 |
Transient numerical simulation and visualization of self-priming process in self-priming centrifugal pump |
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| LU Tianqiao,LI Hong,ZHAN Lianchen.Transient numerical simulation and visualization of self-priming process in self-priming centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2016,34(11):927-933. |
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| Authors: | LU Tianqiao LI Hong ZHAN Lianchen |
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| Institution: | National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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| Abstract: | Based on the Euler multiphase model, standard k-ε turbulence model and sliding mesh technique, the self-priming process in a 65ZB-40C self-priming centrifugal pump are simulated. The experimental rotational speed curve of impeller and pressure curve at the pump outlet are taken as the boundary conditions in the simulation. The monitoring planes/surfaces are set in the volute, impeller, air-liquid separation chamber and reflux hole to analyze the changes of air volume fraction, air and liquid velocity and pressure. The numerical results are compared with the observation made by using high-speed camera. The results show that the air-liquid two-phase flow patterns are consistent with the observed pressure, flow rate and rotational speed in experiment. The stable self-priming process occupies the maximum portion of the self-priming time and has the most significant effect on the self-priming performance. In the end of the self-priming process, the flow rate and pressure change abruptly. The water droplets in the air-liquid separation chamber and the bubbles at the outlet of volute nozzle increase and decrease rapidly, showing an apparent transient effect. The gas phase cavity in the center of air-liquid separation chamber is beneficial to the formation of moving bubbles in the volute outlet area and the steady gas discharging from the self-priming pump. |
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| Keywords: | self-primin pump self-priming process gas-liquid two-phase flow numerical simulation high-speed photograph |
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