Experimental Investigation of the Decay from A Ships Propeller

Abstract：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 ships propeller jet (Fuehrer and Romisch, 1977; Blaauw and van de Kaa, 1978; Berger et al., 1981; Verhey, 1983) as reported in a pure water jet (Albert.son 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 ships propeller. 作者： Author： W. Lam[1]  G. A. Hamill[2]  SONG Yong-chen[1]  D. J. Robinson[2]  S. Raghunathan[2] 作者單位： Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, ChinaQueens University Belfast, Northern Ireland BT9 5AG 期 刊： 中國(guó)海洋工程(英文版)   ISTICEISCI Journal： CHINA OCEAN ENGINEERING 年，卷(期)： 2011, 25(2) 分類號(hào)： U664.33 U661.7 Keywords： ships propeller jet    Laser Doppler Anemometry (LDA)    maximum velocity decay    機(jī)標(biāo)分類號(hào)： O35 TV1 機(jī)標(biāo)關(guān)鍵詞： Ship    axial velocity    experimental investigation    turbulent characteristics    Laser Doppler    initial stage    ship    study    water jet    different    flow    insight    found    pull    van    use    LDA    Dai 基金項(xiàng)目： This research was financially supported by SPUR Studentship from Queens University Belfast and is currently supported by the National Natural Science Foundation of China，Petro China Innovation Foundation from China National Petroleum Corporation

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