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| Influence of impeller passage structure on performance of doublechannel pumps |
| ZHAO Bin-Juan, HOU Duo-Hua, CHEN Hui-Long, LIU Zhi-Bin |
(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
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Abstract From the perspective of structural changes of impeller passage, the internal flow field in doublechannel pumps and flow characteristics were studied. Standard k-ε turbulent model and implicit multigrid coupling method were applied to numerically simulate the threedimensional inner turbulent flow of the wholepassage of three types of pumps (scheme a:up circle type, scheme b:straight line type, and scheme c:down circle type). Under the same flow rate conditions, hydraulic performance were compared and optimal doublechannel impeller passage structure were explored between the three types of pump. It was found that different impeller channel structure presented a certain degree of regularity and diversity of velocity & pressure distribution under the design conditions. Efficient proper volume of impeller channel has been increased both in scheme a and scheme c. In comparison, scheme a has the superior nonblocking performance and the minimum hydraulic efficiency, with a clear pressure drop at the passage inlet; scheme c has the maximum hydraulic efficiency and the lowest head .Comprehensive analysis of the hydraulic performance and nonblocking performance, scheme b with the highest head of 14.46 m and the higher hydraulic efficiency of 78.24%,has superiority,Analysis of steady variable condition properly based on numerical simulation and corresponding test verification,scheme b is the optimum structure of impeller passage in doublechannel pumps.
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Received: 24 September 2012
Published: 30 April 2013
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