Cavitating flow analysis and design optimization for a waterjet mixed flow pump

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Huang, R.F.^1,2 ; Zhai, Z.H.^2 ; Zhou, J.J.^2 ; Luo, X.W.^1

State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing

100084, China^1

Science and Technology on Water Jet Propulsion Laboratory, Shanghai

200011, China^2

关键词: Cavitation characteristics;    Cavitation flow simulation;    Cavitation performance;    Commercial software;    Design optimization;    Hydraulic characteristic;    Hydraulic performance;    K-Omega turbulence model;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012073/pdf
DOI  :  10.1088/1755-1315/163/1/012073

来源: IOP

【 摘 要 】

This research investigates cavitation flow simulation and design optimization for a waterjet mixed flow pump whose design flow coefficient is 0.183 and rotational speed is 1450 r/min. Both the hydraulic and cavitation characteristics are predicted and compared with model test. In order to improve the pump performance, an optimized impeller is obtained with the blade thickness reducing by 0.6 mm and adjusting the blade inlet angle. The cavitating flow in a waterjet mixed flow pump is simulated using the SST k-ω turbulence model and homogeneous cavitation model with a single blade-to-blade flow passage. Compared with the experimental results, the numerical data are in reasonable agreement for predicting hydraulic characteristics and show a similar trend in cavitation performance prediction. Future work will focus on improving the cavitation model for better accuracy of cavitation prediction. Based on the experimental test and commercial software CFX simulation, it can be concluded that reducing the blade thickness and inlet angle can have favorite effects on the hydraulic performance as well as cavitation performance.