Abstract
Water jet propulsion technology has broad application prospects in the field of ships, and water jet technology is a kind of high and new technology that is booming and has a wide range of applications. However, there are a few studies on the effect of the external jet on the performance of the water jet propulsion pump, and it is urgent to carry out this research. In this paper, the standard k-ε turbulence model is used to carry out the numerical simulation study of the influence of the external jet on the hydraulic performance and flow field characteristics of the water jet propulsion pump device. This paper discusses the selection of calculation models, the division of grids and the setting of turbulence models, and an in-depth analysis of the calculation results. The research results show that when a high-speed water jet enters a moving water body, it will cause turbulence in the moving water body. With the increase of jet flow, the turbulence phenomenon will be improved. The average velocity of the outlet section of the nozzle is consistent with the change of the total pressure. The average vortex gradually decreases, the turbulent kinetic energy changes little, the turbulence dissipation first decreases and then increases, and the nozzle axial force changes more and more. The axial force and thrust of the device will obviously increase when the two water streams merge and spray, and they will increase with the increase of the jet flow rate. By revealing the influence mechanism of the external jet on the water jet propulsion pump device, it can provide a theoretical basis and guiding direction for further optimizing the hydraulic performance of the entire device.
Highlights
Due to the superiority of water jet propulsion technology, more high-speed ferries, commercial ships, and military vessels use water jet propulsion pump devices
Is paper is based on the standard k-ε turbulence model to numerically simulate the flow field of a water jet propulsion pump device with an external jet and use the velocity, total pressure, vorticity, turbulent kinetic energy cloud image, and other flow field information data of the nozzle outlet section and the longitudinal section of the nozzle section
By intuitive observation of the internal flow characteristics of the nozzle section of the propulsion pump, this paper reveals the influence mechanism of the external jet and provides a theoretical basis and guiding direction for further optimizing the hydraulic performance of the entire device
Summary
Due to the superiority of water jet propulsion technology, more high-speed ferries, commercial ships, and military vessels use water jet propulsion pump devices. Scholars at home and abroad have conducted a large number of experimental studies and numerical simulation studies on the water jet propulsion pump device, which has made the water jet propulsion technology a breakthrough development in recent decades [1,2,3]. Is paper is based on the standard k-ε turbulence model to numerically simulate the flow field of a water jet propulsion pump device with an external jet and use the velocity, total pressure, vorticity, turbulent kinetic energy cloud image, and other flow field information data of the nozzle outlet section and the longitudinal section of the nozzle section. By intuitive observation of the internal flow characteristics of the nozzle section of the propulsion pump, this paper reveals the influence mechanism of the external jet and provides a theoretical basis and guiding direction for further optimizing the hydraulic performance of the entire device
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