排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2019, Vol. 37 Issue (6): 528-533    DOI: 10.3969/j.issn.1674-8530.17.0168
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Numerical simulation of cavitation flow in whole flow path of water-jet propulsor
CEN Chunhai, PAN Zhongyong*, WANG Xuebao
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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Abstract In order to reveal the distribution of cavitation inside the water-jet propulsor, the SST k-ω turbulence model and the Zwart cavitation model, based on the ANSYA CFX software, were used to calculate the steady value of the whole flow path of the water-jet propulsor at different speeds. The vo-lume fraction distribution of bubbles in two-stage impeller blades and the flow path in the water-jet propulsor at different speeds was obtained. The results show that the cavitation occurred initially in the local low-pressure zone at the leading edge of the front impeller suction surface. As the speed increases, the bubbles spread from the leading edge to the hub, and the volume fraction gradually increases. owing to the impact of non-uniform flow, the rear impeller suction surface in the middle of the low-pressure area begins to appear cavitation. With the increasing of the rotational speed, the cavitation is expanded from the middle of the blade to the outlet, and the cavitation is more serious in the lower half of flow path of the rear impeller. Under different NPSHr, there is no cavitation in the rear impeller pressure surface due to the pre-pressing of the front impeller, which shows that the counter-rotating axial-flow water-jet propulsor has good cavitation performance.
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CEN Chun-Hai
PAN Zhong-Yong-*
WANG Xue-Bao
Key wordswater-jet propulsion   cavitation   front and rear impeller   bubbles volume fraction   numerical simulation     
Received: 2017-07-22;
Cite this article:   
CEN Chun-Hai,PAN Zhong-Yong-*,WANG Xue-Bao. Numerical simulation of cavitation flow in whole flow path of water-jet propulsor[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(6): 528-533.
 
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