Journal Article

Experimental and numerical study on cavitation pulsating pressure of water-jet propulsion axial-flow pump

Wang, Zong-Long, Liu, Teng-Yan, Qiu, Ji-Tao, Dai, Yuan-Xing, Cai, You-Lin, Liu, Xia-Yong

2024

Overview

Cavitation may occur in water-jet pump during operation of water-jet propulsion vessel, and once cavitation occurs, the tip clearance pulsating pressure of the impeller may be intensified, resulting in increased vibration of the water-jet propulsion unit. In this paper, the cavitation pulsating pressure characteristics at different positions in the pump are studied by experiment and numerical simulation, and the pulsating pressure characteristics in tip clearance are mainly researched. Based on Star-CCM+ commercial software, unsteady Reynolds-averaged Navier-Stokes equations(RANS) numerical simulation is carried out, and the feasibility of the numerical simulation method is verified by uncertainty analysis. The results show that the cavitation pulsating pressure near the leading edge of the impeller in the tip clearance is the largest. The variation of the tip clearance pulsating pressure with the intensification of cavitation is studied by numerical simulation, and its mechanism is revealed. A dimensionless coefficient of net positive suction head ( C NPSH ) is proposed, and the study shows that the cavitation pulsation pressure coefficients of pumps of different scales are equal when the working conditions are similar and the C NPSH are equal, which indicates that the cavitation pulsating pressure performance of full scale pump can be predicted by model scale. It is of great significance to evaluate the vibration performance of the full scale water-jet propulsion.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Analysis / Axial flow pumps / Cavitation / Computer and Information Sciences / Computer Simulation / Engineering and Technology / Evaluation / Flow velocity / Impellers / Jet propulsion / Mathematical analysis / Mathematical models / Models, Theoretical / Navier-Stokes equations / Numerical analysis / Numerical simulations / Performance evaluation / Physical Sciences / Pressure / Pressure head / Research and Analysis Methods / Reynolds averaged Navier-Stokes method / Reynolds number / Simulation / Suction / Tip clearance / Turbulence models / Uncertainty analysis / Vibration / Vibration analysis / Water / Working conditions