|
|
Optimum condition of water-jet propulsion |
Cao Puyu, Wang Yang, Li Guidong, Peng Shuai |
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
|
|
Abstract The maximum pipeline efficiency is applied to design water-jet propulsion in traditional design methods. However, the parameters under operation condition often deviate from the rated point and the efficiency of water-jet propulsion is always less than the expected one. In this paper, the inlet flow passage of SDPM-450 water-jet propulsion was examined to overcome this discrepancy. Based on the analysis results of the efficiency in water-jet propulsion under the optimal operating point, the parameter selection methods was optimized to meet with the object of the maximum whole propulsion efficiency. The optimal operating point is the working point with the maximum propulsion efficiency. According to the extreme value theory, the mathematical equation was deduced to determine the optimal operating point. The mathematical equation is listed as K=2εα. The numerical simulation of UDS back tracing method was used to verify the derived mathematical equation. The mathematical equation was applied to determine the designed parameters of water-jet propulsion after the correction. The higher efficiency designed method, which the variables of nozzle diameter and wake fraction are selected in the designed equation, is obtained. These all provide the theory foundation for the higher efficiency design of water-jet propulsion.
|
Received: 29 April 2014
|
|
|
|
[1]Bulten. A breakthrough in waterjet propulsion systems[C]//International Maritime Defence Exhibition and Conference.Doha:DIMDEX, 2008.[2]王立祥.船舶喷水推进[J]. 船舶, 1997(3):45-52. Wang Lixiang. water-jet of ships[J]. Ship and Boat, 1997(3):45-52.(in Chinese)[3]Parka W G, Yun H S, Chun H H, et al. Numerical flow simulation of flush type intake duct of waterjet[J]. Ocean Engineering,2005,32(17/18): 2107-2120.[4]Hu Peixin, Zangeneh M. Investigations of 3D turbulent flow inside and around a water-jet intake duct under different operating conditions [J]. Journal of Fluids Engineering, 1999, 121(2): 396-404.[5]Brandner P A, Walker G J. An experimental investigation into the performance of a flush water-jet inlet[J]. Journal of Ship Research. 2007, 51(1): 1-21.[6]Jung K H, Kim K C, Yoon S Y,et al. Investigation of turbulent flows in a waterjet intake duct using stereoscopic PIV measurements[J]. Journal of Marine Scie-nce and Technology, 2006, 11(4): 270-278.[7]Verbeek R. Recent development in waterjet design[C]//Proceedinds of International Conference on Water-jet Propulsion II, 1998.[8]Tervisga V. The effect of waterjet-hull interaction on thrust and propulsion efficiency[C]//Proceedings of International Conference on Fast Sea Transportation Conference.Trondheim:Tapir, 1991.[9]Terwisga V A N. Report of the specialist committee on validation of waterjet test procedures to the 24th ITTC[C]//Proceedings of the 24th International Towing Tank Conference.Edinburgh:ITTC,2005: 471-508.[10]常书平, 王永生, 靳栓宝, 等. 载荷分布规律对混流泵叶轮设计的影响[J]. 排灌机械工程学报, 2013, 31(2): 124-128. Chang Shuping, Wang Yongsheng, Jin Shuanbao, et al. Influences of blade loading distribution law on design of mixed-flow pump impeller[J]. Journal of Drainage and Irrigation Machinery Engineering, 2013, 31(2): 123-127.(in Chinese)[11]常书平,王永生,庞之洋, 等. 进速比对喷水推进器进水流道性能影响研究[J]. 武汉理工大学学报:交通科学与工程版, 2010, 34(4): 721-726. Chang Shuping, Wang Yongsheng, Pang Zhiyang, et al. Research on effects of IVR conditions in waterjet inlet performance[J]. Journal of Wuhan University of Technology:Transportation Science & Engineering, 2010, 34(4):721-726.(in Chinese)[12]Ding Jiangming,Wang Yongsheng. Research on flow loss of inlet duct of marine waterjets[J]. Journal of Shanghai Jiaotong University(Science), 2010, 15(2): 158-162.[13]金平仲. 喷水推进主要参数的确定[J]. 中国造船,1978(1):78-89.(in Chinese) Chin Pingchung. Determination of the main parameters of water-jet propulsion system[J]. Shipbuilding of China, 1978(1):78-89.[14]Alexander K. Waterjet versus propeller engine matching characteristics[J]. Naval Engineering Journal, 1995, 107(3): 129-139. |
|
|
|