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| Analysis of pressure fluctuation of water jet propellerunder different ship speeds |
| MENG Kaixuan*, PAN Zhongyong, WANG Xuebao |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to understand the internal pressure pulsation characteristics of the water jet propeller, the contra axial water jet propeller is taken as the object of study and based on the computational fluid dynamics(CFD)method with the SST k-ω turbulence model is used to close the equations.A mesh independence analysis shows that the calculated power and head are well consistent with the design data. In waterjet inlet and first impeller, two stage impeller clearance between the impeller and the diffuser and the secondary impeller set between the monitoring points, monitoring the pressure data in different positions. The time domain and frequency domain diagrams of each monitoring point are obtained, and the pressure fluctuation characteristics of each monitoring point are compared and analyzed. Under the design conditions, according to the pressure pulsation of the water jet propeller at the same design position, the pulsation distribution of the propeller at different speeds is compared and analyzed. The results show: The first impeller of the propeller mainly affects the pressure fluctuation at its inlet,and the secondary impeller mainly affects the pressure fluctuation at the two-stage impeller clearance; at low ship speed, the vane mainly affects the pressure pulsation at the secondary impeller exit; in the axial direction of the propeller,due to the two-stage impeller counter-rotation,the amplitude of the pressure pulsation changes the most. At high ship speeds, the pressure fluctuation between the secondary impeller and the vane changes drastically
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Received: 07 July 2017
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| [1]王立祥, 施丹. 具有巨大潜在市场的喷水推进技术[J]. 上海造船, 2000(2):42-48. WANG Lixiang, SHI Dan. Water jet propulsion technology with huge potential market[J]. Shanghai shipbuilding, 2000(2):42-48.(in Chinese)[2]PARK 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):2107-2120.[3]金平仲. 船舶喷水推进[M]. 北京:国防工业出版社, 1986.[4]PARK W G, JANG H J, CHUN H H, et al. Numerical flow and performance analysis of waterjet propulsion system[J]. Ocean engineering, 2005,32(14):1740-1761.[5]王立祥. 喷水推进及喷水推进泵[J]. 通用机械, 2007(10):12-15. WANG Lixiang. Water jet propulsion and water jet pump[J]. General machinery, 2007(10):12-15.(in Chinese)[6]倪永燕, 吴涛涛. 泵喷水推进器分析与设计改进[J]. 船海工程, 2012,41(5):61-63,67. NI Yongyan, WU Taotao. Analysis and improved design for the water-jet propulsor[J]. Ship and ocean engineering, 2012,41(5):61-63,67.(in Chinese)[7]JOHN A. Marine waterjet propulsion[J]. Transactions of Society of Naval Architects and Marine Engineers, 1993,101:275-335.[8]SPENCE R, AMARAL-TEIXEIRA J. A CFD parame-tric study of geometrical variations on the pressure pulsations and performance characteristics of a centrifugal pump[J]. Computers & fluids, 2009,38(6):1243-1257.[9]BERTEN S, DUPONT P, FABRE L, et al. Experimental investigation of flow instabilities and rotating stall in a high-energy centrifugal pump stage[C]//Proceedings of ASME 2009 Fluids Engineering Division Summer Meeting, 2009:505-513.[10]常书平, 王永生, 魏应三,等. 喷水推进器内非定常压力脉动特性[J]. 江苏大学学报(自然科学版), 2012, 33(5):522-527. CHANG Shuping, WANG Yongsheng, WEI Yingsan, et al. Pressure fluctuation of unsteady flow in waterjet[J]. Journal of Jiangsu University(natural science edition), 2012, 33(5):522-527.(in Chinese)[11]FURUKAWA A, SHIGEMITSU T, WATANABE S. Performance test and flow measurement of contra-rotating axial flow pump[J]. Journal of thermal science, 2007,16(1):7-13.[12]潘中永, 袁寿其. 泵空化基础[M].镇江:江苏大学出版社, 2013.[13]TAKAI T, KANDASAMY M, STERN F. Verification and validation study of URANS simulations for an axial waterjet propelled large high-speed ship[J]. Journal of marine science & technology, 2011,16(4):434-447.[14]刘承江, 王永生, 张志宏,等. 喷水推进器推力的CFD计算方法研究[J]. 计算力学学报, 2008,25(6):927-931. LIU Chengjiang, WANG Yongsheng, ZHANG Zhihong, et al. Research on computational methods of waterjet thrust using CFD[J]. Chinese journal of computational mechanics, 2008,25(6):927-931.(in Chinese) |
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