Performances of Water Jet Propulsion with PD Pump

Abstract:

Water jet propulsion (WJP) with positive displacement pump (PD pump), in which the suction thrust of PD pump (Due to the effect of pump suction and the influence of the suction boundary layer) and the reaction thrust of water jet are used to push watercraft forward, has many advantages like high efficiency,low noise, high maneuverability, good adaptability to variable working conditions, simple transmission mechanism over traditional propulsion methods. A mathematical model is developed and the WJP theory with PD pump is analyzed. Numerical studies are carried out to study the suction thrust, reaction thrust, and propulsion efficiency of the thruster with Bernoullihyperbolic suction inlet-PD pump-Bernoulli hyperbolic nozzle. The results show that: 1) in the conditions of no cavitation in suction inlet and constant flow rate, the suction thrust is inversely proportional to the inlet diameter and reaches around 8.5% of the total thrust; 2) the reaction thrust increases with the decrease of the nozzle diameter; 3) the pump-suction coefficient v is proportional to the speed ratio μ; 4) the efficiency of WJP with PD pump is higher than with negative displacement pump under the same speed ratio. The related conclusions provide a basis for the design of high performance water propulsion unit.

• Periodical: Applied Mechanics and Materials (Volumes 602-605)
• Pages: 539-545
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.602-605.539
• Online since: August 2014
• Authors: You Sheng Yang*, Peng Sun, Yang Fu, Chao Chao Zhao
• Keywords: Pd Pump, Reaction Thrust, Suction Thrust, Water Jet Propulsion

References

[1] HUANG Sheng. Engergy saving of ship propulsion and special thrust[M]. Haerbin Engineering University Press, (1998).

[2] OH HW, YOON ES, KIM KS, et al. A practical approach to the hydraulic design and performance analysis of a mixed-flow pump for marine waterjetpropulsion[J]. Journal of Power and Energy, ProcIMechE, Part A, 2003, 217(6): 659-664.

DOI: 10.1177/095765090321700610

[3] JIN Pin zhong. Ship Water Jet Propulsion[M]. Beijing: National Defense Industrial Press, (1986).

[4] Allsion J. Marine water jet propulsion[J]. Transactions Society of Naval Architects and Marine Engineers. 1993, 101: 275-335.

[5] Allsion J. and Jiang C B. Modern Tools for Waterjet Pump Design and Recent Advances in Field[C]. Proceedings of International Conference on Waterjet Propulsion, Amsterdam, Holland, 1998, 2: 1-19.

[6] YANG Yousheng. Mid/High Pressure Water Jet Propulsion and Optimization Design of the Nozzle[D]. Wuhan: Huazhong University of Science and Technology, (2007).

[7] YANGYousheng, JIA Xiaojun, ZHU Yuquan. The theory of positive displacement pump water jet propulsion[J]. Chinese Journal of Mechanical Engineering, 22(24): 2977-2981, (2011).

[8] YANG Y S，NIE S L，ZHU Y Q, et al．Reaction thrust of submerged water jet[J]. J. Power and Energy, ProcIMechE, Part A, 2007, 221(4): 565-573.

[9] HUANG G Q, LI X H, ZHU Y Q, et al. Experimental Study on Reaction Thrust Characteristics of Water Jet for Conical Nozzle[J]. China Ocean Engineering, 2009, 23(4): 669-678.

[10] YANG Y S, FENG F Z, ZHU Y Q, LUO X H. Study of the pressure distribution on nozzle inner wall[J]. Chinese Journal of Mechanical Engineering, 2011, 47(6): 182-186.

[11] YANG Yousheng, ZHANG Jianping, NIE Songlin. The Energy Loss of Nozzles in Water Jet System[J]. Chinese Journal of Mechanical Engineering, 49(2): 139-145, (2013).

[12] Li Z Y. Hydraulic component and system[M]. Beijing: Machinery Industry Press, (2005).