Nozzle Optimization for Water Jet Propulsion with A Positive
Displacement Pump |
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Authors: | YANG You-sheng XIE Ying-chun and NIE Song-lin |
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Institution: | College of Engineering, Ocean University of China;College of Engineering, Ocean University of China;College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology |
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Abstract: | In the water jet propulsion system with a positive displacement (PD) pump, the nozzle, which converts pressure energy into kinetic energy, is one of the key parts exerting great influence on the reactive thrust and the efficiency of the system due to its high working pressure and easily occurring cavitation characteristics. Based on the previous studies of the energy loss and the pressure distribution of different nozzles, a model of water jet reactive thrust, which fully takes the energy loss and the nozzle parameters into consideration, is developed to optimize the nozzle design. Experiments and simulations are carried out to investigate the reactive thrust and the conversion efficiency of cylindrical nozzles, conical nozzles and optimized nozzles. The results show that the optimized nozzles have the largest reactive thrust and the highest energy conversion efficiency under the same inlet conditions. The related methods and conclusions are extended to the study of other applications of the water jet, such as water jet cutting, water mist fire suppression, water injection molding. |
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Keywords: | energy loss nozzle PD pump reactive thrust water jet propulsion |
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