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Influence of different blade cutting shapes on performance of centrifugal pump
Published:2024-11-21 author:YAN Lin, SONG Wenwu. Browse: 36 Check PDF documents
Influence of different blade cutting shapes on performance of centrifugal pump


YAN Lin1,2, SONG Wenwu1,2

(1.Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China; 
2.School of Energy and Power Engineering, Xihua University, Chengdu 610039, China)


Abstract:  The blade of centrifugal pump directly affects the efficiency and service life of centrifugal pump, so it is of great significance to study the blade shape. On the basis of single cutting at the outlet edge of the centrifugal pump blade to change the performance of the centrifugal pump, bidirectional cutting was carried out on the leading and trailing edges of the blade, and the influence of different cutting shapes on the various performance of the centrifugal pump was studied. Firstly, a centrifugal pump with ns=73 was taken as the research object, and UG software was used for 3D modeling and blade cutting of the centrifugal pump, resulting in 24 types of blade models being cut. Then, ICEM software was used to partition the grid, and the standard k-ε turbulence model was selected as the calculation model. Monitoring points were set up at the tongue between the centrifugal pump blades and the volute. Finally, ANSYS CFX software was used to numerically simulate the centrifugal pump without cutting and after cutting, and the external characteristic curves of the centrifugal pump under 0.6Qd~1.4Qd operating conditions were obtained. Under the premise of good external characteristics, the internal flow structure, pressure pulsation characteristics, and turbulent kinetic energy distribution were further studied. The research results show that under the design condition of 1.0Qd, the efficiency of the model after cutting is improved by about 4% compared to the model without cutting. In the model with symmetrical cutting, the model 7 with elliptical leading edge and blunt trailing edge has the highest improvement of 4.8%, while the model 14 with asymmetric cutting leading edge and circular trailing edge and back half cutting has an efficiency improvement of 5.4%. The internal streamline of the noncutting model is disordered and there are many high relative velocity zones inside. The asymmetric cutting model 14 has a uniform distribution of internal streamline in the impeller, and the relative velocity values and distribution areas are reduced. Comparing to the model without cutting, the internal pressure of the cut model increases, and the pressure pulsation of model 7 with symmetric cutting decreases by 10%, while the pressure pulsation intensity of model 14 with asymmetric cutting increases by nearly 30%. The turbulent kinetic energy distribution of the model after cutting has significantly improved, and the turbulent kinetic energy value at the trailing edge has decreased. The turbulent kinetic energy of model 7 with symmetric cutting has a smaller change over time and performs more stably. Taking into account the external characteristics and stability performance of different cutting models, cutting the leading edge into an ellipse and the trailing edge into a blunt shape can effectively improve the performance of centrifugal pumps.

Key words: blade shape of centrifugal pump; codirectional cutting of blade leading edge and trailing edge; external characteristics analysis; internal flow structure; pressure pulsation law; turbulent kinetic energy distribution; computational fluid dynamics(CFD) numerical simulation calculation


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