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Research on Problems of Stern Flow and Propulsive Performance Considering the Interaction between Ship Hull and Propeller

考虑船体与螺旋桨相互作用的尾流及推进性能问题研究

基本信息

批准号：
61460154
负责人：
IKEHATA Mitsuhisa
金额：
$ 4.61万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

At first we carried out the research on analytical characteristics of oscillating pressure distribution avobe a propeller. The calculated and meadured results for a five-bladed propeller have shown the normal distribution of oscillating pressure in cases of a uniform flow and cos2<theta> wake flow but an abnormal distribution in case of co5<theta> wake flow.Secondly we investigated into the influence of boundary layer and wake on free surface flow around a ship model. The Rankine-source method was combined with an integral method for boundary laver and wake under the boundary condition on the free surface considering the total head loss due to viscosity, The computed results as for wave profiles, pressure distributions and resistances were shown in comparison with measurements.Thirdly we performed measurement of the velocity field in the rear region of a model propeller using the laser-doppler velocimeter in the experimental tank. The results made clear the necessity of seeding to detect the slow turning velocity in propeller race and the availability of stators installed just behina the propeller. As the next step we carried out measurement of the velocity fields around the rudder in the uniform flow and in the slip-stream of the propeller using the laser-doppler velocimeter. The measured results showed clearly the interaction between the rudder and the propeller.Finally the unsteady characteristics of the propeller and the rudder were calculated using the voxted lattice method in order to investigate the interaction between the propeller and the rudder. The effects of the rudder on the propeller were found as 7[14% fluctuations of thrust and torque of the propeller and as 2[3% up of the propeller efficiency.

本文首先对螺旋桨脉动压力分布的解析特性进行了研究。对一个五叶螺旋桨的计算和实测结果表明，在均匀流和尾流情况下，振荡压力分布为正态分布<theta>，而在尾流情况下，振荡压力分布为反常分布<theta>。其次，研究了边界层和尾流对船模自由表面绕流的影响。在考虑粘性总水头损失的自由面边界条件下，将Rankine源法与边界层和尾流积分法相结合，计算了波浪剖面，最后，利用激光测速仪测量了螺旋桨尾部的速度场，并与实验结果进行了比较。实验水池中的多普勒测速仪。研究结果表明，在螺旋桨滚道内加引射以检测低速回转的必要性和在螺旋桨后安装定子的可行性。在此基础上，利用激光多普勒测速仪对均匀流中舵面周围的速度场和螺旋桨滑流中的速度场进行了测量。测量结果清楚地显示了舵桨之间的相互作用。最后，为了研究桨舵之间的相互作用，采用体素网格法计算了螺旋桨和舵的非定常特性。舵对螺旋桨的影响是螺旋桨推力和扭矩波动7[14%，螺旋桨效率提高2[3%]。