Experimental investigation of velocity fluctuations in a radial diffuser pump  

作　　者：冯建军 罗兴锜 BENRA Friedrich-Karl DOHMEN Hans-Josef 

机构地区：[1]State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area, Xi'an University of Technology [2]Department of Mechanical Engineering, Faculty of Engineering, University of Duisburg-Essen

出　　处：《Journal of Hydrodynamics》2015年第3期332-339,共8页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51339005,51379174 and 51279160);the Doctoral Fund of Ministry of Education of China(Grant No.20126118130002)

摘　　要：The strong interaction in a radial pump due to the relative movement between the impeller and the diffuser may excite not only strong pressure fluctuations but also velocity fluctuations. In this paper, the laser Doppler velocimetry （LDV） technique is successfully applied to measure the periodic flow field in a radial diffuser pump with low-specific speed, in order to investigate the velocity fluctuations caused by the impeller-diffuser interactions both in the impeller and diffuser regions. The velocity fluctuations in the impeller region are quantitatively examined at different radial positions, and the flow structure at the radial gap between two flow components is analyzed at different relative positions. In addition, the downstream effect on the diffuser flow is quantitatively and qualitatively assessed and compared with the turbulence effect.The strong interaction in a radial pump due to the relative movement between the impeller and the diffuser may excite not only strong pressure fluctuations but also velocity fluctuations. In this paper, the laser Doppler velocimetry （LDV） technique is successfully applied to measure the periodic flow field in a radial diffuser pump with low-specific speed, in order to investigate the velocity fluctuations caused by the impeller-diffuser interactions both in the impeller and diffuser regions. The velocity fluctuations in the impeller region are quantitatively examined at different radial positions, and the flow structure at the radial gap between two flow components is analyzed at different relative positions. In addition, the downstream effect on the diffuser flow is quantitatively and qualitatively assessed and compared with the turbulence effect.

关 键 词：laser Doppler velocimetry （LDV） radial pump impeller-diffuser interaction velocity fluctuations 

分 类 号：TH38[机械工程—机械制造及自动化]