Dynamic Characteristics and Effect on Thrust of Jet Tail Vortex Ring for Pump Jet Propulsion

When a pump is propelled by propeller, the nozzle flooding of jet wake area will produce turbulent quasi-sequence structure and have certain impact on outflow field thrust characteristics water propulsion pump. In this paper, method that combined numerical simulation with vortex dynamics adopted, which analyzes dynamic influence A large eddy turbulence model dimensionless velocity coefficient were used to reveal flow relation, operation parameters ring. The trailing ring 7.0% higher than without Vortex mathematical statistics are quantitatively analyze tail Finally, formation time obtained in exponential relation transmission vorticity coefficient, has nonlinear intensity helicity coefficient. BP Neural Network LM algorithm establish relationship between physical characteristic