Influence of blade camber profile on hydraulic performance of slurry pump and impeller wear characteristic
LI Jing1, ZHANG Renhui1,2*, GUO Rong1, LI Rennian1,2
1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Key Laboratory of Fluid Machinery and Systems, Gansu Province, Lanzhou, Gansu 730050, China
Abstract：The slurry pump of type LC100/350 was used as a studied object to investigate into influences of blade camber profile on pump hydraulic performance and impeller wear characteristic in terms of limestone-water slurry as transported medium. A logarithmic spiral with variable angle was selected to parameterize the camber profile when the impeller meridional plan and blade inlet and outlet angles remain unchanged. The relationships of both hydraulic performance and wear characteristic with camber profile were analyzed numerically in Fluent 16.0 by using discrete phase model(DPM)model. The results show that the cylindrical blade designed by the logarithmic spiral method with variable angle can improve the pump hydraulic efficiency, but will lead to a slightly reduction in the head. The blade camber profile with wrap angle of 120° is the optimal one in four design cases proposed. The pump hydraulic performance and the impeller wear characteristic have been linked each other for the different camber profiles. A small wrap angle impairs the pump hydraulic performance but relieves the impeller wear. The impeller wear intensity is positively correlated with solid volumetric concentration, and the most severely worn regions on the impeller are in the area on the hub in front of the blade leading edges. The influence of blade wrap angle on impeller wear intensity at high flow rates is much more signi-ficant than under design condition and at low flow rates. The influences of solid particle size on hydraulic performance and impeller wear characteristic are basically consistent with those of solid concentration.
