| Experimental Investigation of the Decay from A Ship’s Propeller |
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| 引用本文： | 宋永臣.Experimental Investigation of the Decay from A Ship’s Propeller[J].中国海洋工程,2011,25(2):265-284. |
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| 作者姓名： | 宋永臣 |
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| 作者单位： | W. Lam,SONG Yong-chen(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China);G. A. Hamill,D. J. Robinson,S. Raghunathan(Queen's University Belfast, Northern Ireland BT9 5AG) |
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| 基金项目： | supported by SPUR Studentship from Queen’s University Belfast;supported by the National Natural Science Foundation of China (Grant No. 51006019);Petro China Innovation Foundation from China National Petroleum Corporation (Grant No. 2010D-5006-0208) |
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| 摘 要： | In the present study,an experimental investigation of the decay of the maximum velocity and its turbulent characteristics behind a ship propeller,in "bollard pull" condition(zero speed of advance),is reported.Velocity measurements were performed in laboratory by use of a Laser Doppler Anemometry(LDA) measurement system.Earlier researchers described that the maximum axial velocity is constant at the initial stage of a ship’s propeller jet(Fuehrer and Rmisch,1977;Blaauw and van de Kaa,1978;Berger et al.,1981;Verhey,1983) as reported in a pure water jet(Albertson et al.,1950;Lee et al.,2002;Dai,2005),but a number of researchers disagreed with the constant velocity assumption.The present study found that the maximum axial velocity decays in the zone of flow establishment and the zone of established flow with different rates.The investigation provides an insight into the decays of both the maximum velocity and the maximum turbulent fluctuation in axial,tangential and radial components and the decay of the maximum turbulent kinetic energy.Empirical equations are proposed to allow coastal engineers to estimate the jet characteristics from a ship’s propeller.
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| 关 键 词： | ship’s propeller jet Laser Doppler Anemometry(LDA) maximum velocity decay |
| 收稿时间： | 9 February 2009 |
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