波浪动力艇模型自航试验及数值仿真

为解决受控主动摆翼驱动装置复杂、机械效率较低的问题,研究依靠升沉运动产生的力矩来驱动俯仰运动的被动摆翼装置,并将其应用于波浪动力艇.在波浪作用下,将被动摆翼安装于艇体底部的一定位置处,产生的推力即可推艇前进.在模型试验中,通过改变波浪周期、波高和控制机构的设置,比较试验艇的自由航行速度.结果表明,试验艇的航速与波高呈正相关关系,且当波长与船长之比约为1.8时推进效果最佳.通过数值仿真,显示两种控制机构配置时的水翼工作过程,并估算在一定波浪参数下波浪动力艇可达到的航速,所估算的航速与试验结果吻合较好.

Free Running Model Tests and Numerical Simulation on a Wave Propelled Craft

To deal with the complexity and inefficiency of the driving device for actively controlled oscillating foils,the concept of passive oscillating foils,whose pitch motion is driven by the moment induced bythe heave motion,is investigated and applied to a wave propelled craft. Particularly,the foils are installedbeneath the craft to generate thrust so that the craft can move forward. In the following model test,free running speeds under different wave period,wave height,and foil control configurations are measured andthen compared. It is shown that the free running speed of the craft is of positive correlation with waveheights,and the optimum performance is obtained when the ratio of incident wave length to ship length isapproximately 1.8. Through numerical simulation,the working process of foils with two different controlmechanism configurations is also demonstrated,where the free running speed under certain wave parameters is predicted,and the result is in good agreement with the measured data.