三体船操纵性水动力导数计算及回转性能研究

Calculation of Maneuverability Hydrodynamic Derivatives to Trimaran and Its Turning Ability

三体船作为一种新船型自诞生起就受到广泛关注,但操纵性方面的研究较少.论文为研究三体船片体布局对三体船操纵性能的影响,使用CFD方法对操纵性运动粘性流场进行数值模拟.论文通过对斜拖运动,悬臂运动的数值模拟,得到了三体船操纵性水动力导数.使用旋臂运动对操纵性进行预报所得到的水动力导数阶数高,各水动力导数与各工况之间对应关系清楚,且将惯性类导数和粘性类导数完全分离,进一步提高了预报精度.论文对旋臂运动进行数值模拟,以此预报三体船的操纵性中的回转性能,并研究三体船片体布局对回转性的影响.结果表明:(1)片体前移,三体船的回转性能较好;(2)片体间距越小,三体船回转性能越好.

Trimaran is a new kind of ship which is popular,but few research considering its manuveribility.In this paper,CFD is used to simulate the viscous flow field in maneuvering motion of trimaran.Hydrodynamic derivatives are got via numerical simulating of oblique towing test and rotating arm test.The simulatiton of rotating arm test can result in high order hydrodynamic derivatives.Moreover,rotating arm test can make viscous derivatives independent of initial derivatives.According to the derivatives got on the simulation,the influence of different longitudinal and transverse position of outtrigger on turning ability is studied.