Numerical Study on Cavitation Characteristics of Water Jet Propulsor Impeller under Oblique Flow Condition
Aiming at the cavitation problem in the impeller of water jet propulsor under oblique flow con-dition,SST k-w turbulence model and Zwart cavitation model were used to simulate the flow field charac-teristics of water jet propulsor under different oblique flow angles.The influence characteristics of the ob-lique flow angle on the hydraulic performance of waterjet propulsor,the cavitation distribution on the blade surface and the cavitation distribution in the tip clearance area of the water jet propulsor were obtained.The results show that when the oblique flow angle gradually increases from 0° to 40°,the propulsion pump mass flow and head increase,while the efficiency decreases by about 3％;with the increase of the oblique flow angle,the cavitation distribution on multiple blade surfaces will be gradually affected in turn,the cav-itation area on the blade surface constantly develops from the inlet edge of the suction surface to the outlet;the range of leakage flow cavitation in the tip clearance area,tip leakage vortex cavitation and entrainment zone cavitation will continue to expand with the increase of oblique flow angle,and there will be mutual in-terference and mixing,and finally the tip region cavitation tends to be stable;with the increase of oblique flow angle,the distribution and development law of cavitation and vorticity near tip inlet are similar.
water jet propulsoroblique flowcavitationtip clearance
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