Experimental Study on Influence of Bladeless Cavity Width on Performance of Vortex Pumps
This paper takes the impellers of the R30 single-oblique blade and the two types of segmented bidirectional oblique blades,namely R30-F30 and R15-F60,as the research objects.By changing the length of the transition section to alter the width of the bladeless cavity,an experimental study on the perfor-mance of the vortex pump is carried out,and a comparative analysis is made on the influence of the width of the bladeless cavity of the vortex pump on its performance.The results show that as for the head of the vortex pump,the head is relatively flat before the flow rate at the best efficiency point and will drop rapidly after the flow rate at the best efficiency point.For the impellers of the three different types,under the rated flow rate,the vortex pump has an optimal width of the bladeless cavity.Under this width of the bladeless cavi-ty,the head of the vortex pump is the highest.Moreover,with the increase in the width of the bladeless cavity,the efficiency of the vortex pump first de-creases and then increases.
vortex pumpwidth of bladeless cavityhydraulic perfor-manceexperimental research
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