Blockage and distortion effects on a vane-island type diffuser performance of centrifugal pumps for various flow rates
Blockage and distortion effects on a vane-island type diffuser performance of centrifugal pumps for various flow rates作者机构：National Research Center of PumpsJiangsu University Laboratoire de Mécanique de Lille (UMR CNRS 8107)Arts et Métiers ParisTech Laboratoire de Mécanique de Lille(UMR CNRS 8107)Ecole Centrale de Lille
出 版 物：《排灌机械工程学报》 (Journal of Drainage and Irrigation Machinery Engineering)
年 卷 期：2016年第34卷第12期
页 面：1013-1021页
学科分类：080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理]
基 金：The National Natural Science Foundation of China(51509108) the Natural Science Foundation of Jiangsu Province(BK20150516) the China Postdoctoral Science Foundation(2015M581735,2016T90422) Senior Talent Foundation of Jiangsu University(15JDG048)
主 题：vane island diffuser flow structure pressure recovery three-hole probe particle image velocimetry
摘 要：Experimental investigation of mean flow velocity and pressure inside the vane-island type diffuser passage of a test centrifugal pump model is presented.A directional three-hole probe was used to investigate hub-to-shroud flow properties at diffuser leading and trailing edge *** addition,the mid-section between suction and pressure sides along the diffuser passage was also *** these measurements were performed at five different flow *** flow structures at the inlet section of the diffuser and along with the passage were analyzed in detail,with a focus on the flow distribution and the pressure recovery evolution of different diffuser *** and distortion effects were analyzed by using existing published particle image velocimetry(PIV)measurements in the outer part of the impeller and around the diffuser throat in order to get a better understanding of the overall performances and local flow structures of such a diffuser *** results show that back flows occur on the shroud region from impeller exit plane up to the semi-vaneless part of the diffuser at low flow *** blockage effects combining with blade thickness geometrical blockage tend to diminish the effects of theoretical high positive *** high flow rates,negative incidence effects induce high local velocity on the pressure side of the diffuser just after the *** aerodynamic blockage associated with low flow distortions are found to have a beneficial effect on pressure recovery for low flow *** the contrary,high flow distortions are found for increased flow rates,resulting in a low pressure recovery inside the semi-vane less part of the diffuser and after the throat.
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