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| Hydrodynamic optimization of large pump installation with two-way channel and experiment |
| HUANG Liangyong1, WU Zhong1, ZHANG Xiao1, LI Yanjun2 |
| 1.Taihu Treatment Project Construction Administration Bureau, Jiangsu Province, Wuxi, Jiangsu 214000, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Large vertical pump installations with two-way channel have been widely used in reversible pumping stations. However, the optimal design theory and method for the two-way channel remain imperfect, causing a low hydraulic efficiency in such an installation. Consequently, a vertical pump installation with two-way channel is studied. By considering the velocity uniformity at the outlet of entry channel and the hydraulic loss across the channel as two objective functions, the open height of the channel is optimized using CFD technique through comparing multiple design cases. It is shown that when the open height is equal to 0.57D the hydraulic loss not only increases less but the outlet velocity uniformity is also the best. The effects of discharge channel height on hydraulic performance of the discharge channel are identified. A bigger discharge channel height can result in a higher discharge velocity and a more significant hydraulic loss. The hydraulic loss across the discharge channel decreases gradually with reducing discharge channel height. However, once the height is below a certain value, the diffusion hydraulic loss in the channel becomes dominant, causing an increasing hydraulic loss. This suggests that there is an optimal discharge channel height at which the minimum hydraulic loss is achievable. In this paper, this height is 0.48D. An optimally selected pump is installed in a pumping installation with the optimized two-way channel, then a hydraulic performance test on the installation is carried out, showing 71.9% hydraulic efficiency at 3.26 m low net head. This two-way channel can provide a reference for installation optimization of the same sort of pumps in the future.
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Received: 08 August 2015
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