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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