| 粗糙度对离心泵空化过程的影响 |
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| 引用本文： | 徐维晖,侯晓,胡孟,何小可,王为术.粗糙度对离心泵空化过程的影响[J].排灌机械工程学报,2018,36(3):197-203. |
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| 作者姓名： | 徐维晖 侯晓 胡孟 何小可 王为术 |
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| 作者单位： | 1.华北水利水电大学热能工程研究中心, 河南 郑州 450045; 2.中国水利水电科学研究院, 北京 100038 |
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| 摘 要： | 为研究壁面粗糙度对离心泵空化过程的影响,利用雷诺时均N-S方程和RNG k-ε两方程,采用Zwart空化模型且不考虑水中溶解性气体对空化的影响,应用ANSYS CFX软件对设计流量工况下离心泵全流道气液两相湍流进行定常数值模拟,分析离心泵内部发生空化时,叶片壁面粗糙度对泵的外特性参数和内部流态的影响.计算结果表明:增大粗糙度将导致离心泵扬程、效率降低以及轴功率增大;泵处在临界空化及局部空化状态时,粗糙度对泵性能参数的影响程度大于泵处在空化初生及重空化状态下的影响程度;壁面粗糙度对湍流发展的影响规律与其对空化进程的影响作用具有相似性;当进口压力为81.06 kPa和101.33 kPa时,减小壁面粗糙度对改善离心泵性能有更显著的效果.
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| 关 键 词： | 离心泵 壁面粗糙度 空化 数值模拟 |
| 收稿时间： | 2017-01-05 |
Impact of wall roughness on cavitating process in centrifugal pump |
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| XU Weihui,HOU Xiao,HU Meng,HE Xiaoke,WANG Weishu.Impact of wall roughness on cavitating process in centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering,2018,36(3):197-203. |
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| Authors: | XU Weihui HOU Xiao HU Meng HE Xiaoke WANG Weishu |
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| Institution: | 1.Thermal Engineering Research Center, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China; 2.China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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| Abstract: | To study the effect of wall roughness on cavitating process in centrifugal pumps, the steady internal flow in a centrifugal pump was simulated numerically by using ANSYS CFX. The fluid domains of the pump were generated by using Pro/E software. The RNG k-ε turbulence model and Zwart′s cavitation model,which doesn′t consider non-condensable gas in water, were applied in simulations. The numerical simulations of flow in the pump were conducted under design flow condition. Then the influences of wall roughness on cavitation characteristic and internal flow pattern were analyzed by changing the wall roughness of the blades. The results showed that an increased roughness led to a decline in the pump head and efficiency but an increase in the shaft power.The degree of influence of roughness on the pump performance in the critical and local cavitation states is more significant than that in the subcritical and supercritical cavitation conditions. The effect of roughness on turbulent kinetic energy in the pump is similar to the influence on the development of cavitation.A reduced wall roughness has a significant effect on the improvement of centrifugal pump characteristics, when the inlet pressure is 81.06 kPa and 101.33 kPa. |
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| Keywords: | centrifugal pump wall roughness cavitation numerical simulation |
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