Abstract:The inner flow characteristics in a doublechannel pump were measured under eight flow rates with a particle image velocimetry (PIV). To guarantee the accuracy of three dimensional PIV measurements, a few key techniques, such as the optical fiberbased external trigger synchronization system and three dimensional equivalent calibration methods, were applied in the measurements. A Visual C++2005 code was composed to obtain the relative velocity components from the absolute ones measured according to the velocity triangle. The results showed that one large scale doesnt appear in a flow passage of the impeller until the flow rate as low as 04 time the design flow rate Qd.. Moreover, this vortex gets more evident with decreasing flow rate. As flow rate decreases, the absolute velocity in the volute diffuser is decreased as well. A vortex doesnt occur there until the flow rate is reduced to 02Qd. The absolute velocity gets maximum values at the flow rate of 02Qd. There exist dominated largescale vortices in the impeller and volute at the shutoff condition, suggesting the poorest flow condition has emerged there.
吴贤芳, 刘厚林, 王凯, 谈明高, 杨东升. 全工况下双流道泵内流三维PIV测量[J]. 排灌机械工程学报, 2012, 30(6): 665-669.
WU Xian-Fang, LIU Hou-Lin, WANG Kai, TAN Ming-Gao, YANG Dong-Sheng. 3D PIV measurement of flow in doublechannel pump under overall operating conditions. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(6): 665-669.
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