Abstract:Mixed flow pumps are widely used in many fields,and the performance of a whole pump is affected by the flow in the impeller to a great extend. To make clear the flow phenomena in mixed flow impellers under design and off-design flow rate conditions, a mixed flow unshrouded impeller was ma-nufactured, and the flow in the impeller at design and off-design flow rates was measured by particle image velocimetry(PIV). In the experiment, the volute was specially designed and manufactured by transparent material. The distribution of time-average relatively velocity from the experiment shows that velocity near blade pressure surface at design flow rate decreases and then increases from inlet to outlet of the impeller, when the velocity near blade suction surface increases and then decreases. The velocity near the suction surface decreases from hub to casing, and the minimal velocity appears near the casing and suction surface. Near the impeller outlet, the relative velocity near blade pressure surface varies a little alone the span direction; and back-flow phenomena can be found at passage outlet near casing and mid-span sections at partial flow rates. To clarify the effect of asymmetrical volute geometry on the velocity distribution, the flow in passages at different impeller relative positions to the volute tongue was tested and the results show that the velocity distributions in different passages are similar.
卢金玲, 郭鹏程, 冯建军, 邓佳, 罗兴锜. 混流泵内部流动的试验研究[J]. 排灌机械工程学报, 2014, 32(2): 119-124.
Lu Jinling, Guo Pengcheng, Feng Jianjun, Deng Jia, Luo Xingqi. Experimental study on flow of mixed flow pumps. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(2): 119-124.
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