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Effect of inlet guide vane position on hydraulic performance of bulb tubular pump |
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Jiangsu Province General Irrigation Canal Management, Huai′an, Jiangsu 223200, China |
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Abstract The hydraulic performance of one bulb tubular pumping system in the Huai′an Third Pumping Station in South to North Water Diversion Project was simulated numerically and validated experimentally, the especially, the effects of inlet guide vane position on the performance were clarified. It was shown the efficiency of the pumping system was improved by 1.28% at the design point when the distance was 500 mm, i.e. 0.064 5<i>D</i>, measured from the guide vane trailing edge to the impeller blade leading edge in comparison with the original design. At the same time, the hydraulic loss in the suction channel was obviously decreased and the uniformity of velocity profile in its cross-section was improved. The uniformity of axial velocity distribution and the weighted average angle of velocity at the outlet of the guide vane were remarkably improved under various working conditions, in consequence, the flow pattern in front of the impeller became better obviously. The influence of inlet guide vane position on the flow in the suction channel and the hydraulic performance of pumping system doesn′t present a simple linear relationship, instead there exists an optimal position between the guide vane trailing edge and the impeller blade leading edge.
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Received: 12 June 2016
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