China Ocean Engineering

, Volume 28, Issue 3, pp 409–419 | Cite as

Nozzle optimization for water jet propulsion with a positive displacement pump

  • You-sheng Yang (杨友胜)Email author
  • Ying-chun Xie (谢迎春)
  • Song-lin Nie (聂松林)


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.

Key words

energy loss nozzle PD pump reactive thrust water jet propulsion 


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Copyright information

© Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • You-sheng Yang (杨友胜)
    • 1
    • 2
    Email author
  • Ying-chun Xie (谢迎春)
    • 1
  • Song-lin Nie (聂松林)
    • 3
  1. 1.College of EngineeringOcean University of ChinaQingdaoChina
  2. 2.State Key Laboratory of Ocean EngineeringShanghai Jiao Tong UniversityShanghaiChina
  3. 3.College of Mechanical Engineering and Applied Electronics TechnologyBeijing University of TechnologyBeijingChina

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