Experimental Investigation on the Performance of a Vortex Pump using Winglets
Résumé
This paper covers the experimental examinations of the influence of attaching winglets to the blade tips of vortex pump impellers. The head, efficiency and power consumption as well as cavitation behavior are analyzed. At first, a series of tests compared an impeller with winglets with a semi-open impeller without winglets and to an impeller with a front shroud. The results suggest that an impeller with winglets leads to the highest head and the greatest efficiency. The impeller with front shroud generates higher head and efficiency than the semi-open impeller, which is frequently used for vortex pumps. A second test series investigates the cavitation performance when blade depth and diameter of impeller are varied compared to the first test series. It could be demonstrated that an impeller with winglets has a similar NPSH characteristic as an impeller without winglets. Thus winglets clearly improve the performance of vortex pumps.
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