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Comparisons between numerical calculations and measurements in vaned diffuser of SHF impeller

排灌机械工程学报 2013年第12期31卷 1013-1020页

作者： Annie-Claude Bayeul-Lainé Patrick Dupont Giovanna Cavazzini Patrick Cherdieu Antoine Dazin Gérard Bois olivier roussette Laboratoire de Mécanique de Lille(UMR CNRS 8107) Arts et Métiers ParisTech Laboratoire de Mécanique de Lille(UMR CNRS 8107) Ecole Centrale de LilleVilleneuve D'Ascq Cedex 59651France Department of Industrial Engineering University of Padova

The paper presents analysis of the performance and the internal flow behaviour in the vaned diffuser of a radial flow pump using PIV(particle image velocimetry)and pressure probe *** measurements have already been performed at middle height inside one diffuser channel passage for a given speed of rotation and various mass flow *** results have been already presented in several previous *** experiments have been performed using a three-hole pressure probe traverses from hub to shroud diffuser width at different radial locations between the two diffuser geometrical *** simulations are also realized with the commercial codes Star CCM+7.02.011 and *** rotor and fully unsteady calculations of the whole pump have been *** between numerical results,previous experimental PIV results and new probe traverses one's are presented and discussed for one mass flow *** this respect,a first attempt to take into account fluid leakages between the rotating and fixed part of the pump has been checked since it may affects the real flow structure inside the diffuser.

关键词： vaned diffuser radial flow pump unsteady flow numerical calculations particle image velocimetry(PIV) three-hole probe

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Blockage and distortion effects on a vane-island type diffuser performance of centrifugal pumps for various flow rates

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排灌机械工程学报 2016年第12期34卷 1013-1021页

作者： SI Qiaorui DAZIN Antoine DUPONT Patrick roussette olivier BOIS Gérard National Research Center of Pumps Jiangsu 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

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.

关键词： vane island diffuser flow structure pressure recovery three-hole probe particle image velocimetry

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