International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Thrust Characteristics and Nozzle Role of Water Jet Propulsion

  • Ni, Yongyan (School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology) ;
  • Liu, Weimin (School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology) ;
  • Shen, Zhanhao (National Research Centre of Pumps, Jiangsu University) ;
  • Pan, Xiwei (National Research Centre of Pumps, Jiangsu University)
  • Received : 2014.10.26
  • Accepted : 2016.01.30
  • Published : 2017.03.31
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Abstract

Surface pressure integration and momentum method were respectively performed to evaluate the impeller thrust and the system thrust of a contra-rotating axial flow water jet propulsion, and an interesting phenomenon so-called thrust paradox was revealed. To explain the paradox, the impeller thrust and the system thrust were physically and theoretically analyzed, the results show that the impeller thrust is head involved and is determined by the hydraulic parameters upstream and downstream the impeller, while the momentum method depicted by a classic equation is valid simply under the best efficiency point. Consequently, the role of a water jet propulsion nozzle was deduced that the nozzle is mainly to limit the flow rate that crosses the impeller and to assure the system working under the best efficiency condition apart from its ability to produce momentum difference. Related mathematical formula expressed the nozzle diameter is the dominant variable used to calculate the working condition of the water jet propulsion. Therefore the nozzle diameter can be steadily estimated by the former expression. The system thrust scaling characteristics under various speeds were displayed lastly.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Jiangsu Provincial Natural Science Foundation of China

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