Study on the influence of back blade shape on the wear characteristics of centrifugal slurry pump

[摘要] CFX particle inhomogeneous model was introduced for the mechanism analysis of a centrifugal slurry pump which is equipped with back blades on impeller shrouds. Combining with the total efficiency correction, the simulation showed good prediction accuracy of external characteristics results compared with the experimental values. Vorticity and Q-Criterion were chosen as the variables to illustrate the abrasion morphology and wear mechanism by contrasting simulation result with worn impeller in engineering. The analysis showed that the large vorticity intensity areas are distributed at the edge of impeller shroud and intensively behind the back blades. Moreover, the vorticity scattered on suction surface of back blade shows the largest intensity. The contour of Q-Criterion demonstrated that the swirl scale in front cavity is obviously larger than that in back cavity. The distribution of vorticity on both front and back shrouds can reasonably explain the impeller wear characteristics. Finally, the forward curved back blade proved to be excellence performance in vorticity distribution.

[发布机构] Key Laboratory of Pressure Systems and Safety, Ministry of Education, University of Science and Technology, NO.130 Meilong Road, Shanghai; 200237, China^1

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Centrifugal slurry pumps;Experimental values;External characteristic;Mechanism analysis;Prediction accuracy;Vorticity distribution;Vorticity intensity;Wear characteristics