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| Experimental study on hydraulic performance of saddle zone in axial flow pump with adjustable guide vane |
| (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China) |
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Abstract In order to analyze the effects of adjustable guide vane(AGV) on axial pumps working in saddle zone, in the hope of optimizing adjusting laws, performance test of a new axial-flow pump with AGV was carried out on the pump test bed. Q-H, Q-η and Q-P curves at different guide vane angles were obtained. The effects of AGV on hydraulic performance of the model pump in saddle zone were analyzed. The results show that, at the same flow rate, head and efficiency of axial flow pump increase as guide vane angle is adjusted from 0° to -5°. With AGV, the separation vortex in the flow channel is suppressed effectively; flow regime at pump outlet is optimized obviously; kinetic energy recovery rate is improved. Head and efficiency of the pump are improved by 0.15 m (0.046 9Hd) and 193% respectively. The critical flow discharge is decreased by 0.004 94 m3/s and the range of saddleshaped zone is narrowed by 6.64%, broadening the range of stable working zone. At guide vane angle of -5°-0°, the shaft power changes little. In this experiment, the best values of hydraulic performance obtained are at -5° guide vane angle, but they can be further improved.
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Received: 07 December 2012
Published: 25 June 2013
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