平头方尾运输船舶开槽减阻研究

传统的平头方尾型运输船舶具有载重大、吃水浅的优点,但航行阻力大,航速低。本文针对该船型开展了开槽减阻的研究,通过在船底开设纵向槽道对艏部高压区进行引流减阻,来实现该船型高航速运输的要求。船体流场及阻力采用RANS方法进行数值模拟,并计及航行姿态的变化。通过改变槽道长度、宽度以及槽道顶板的形状,研究了减阻效果与槽道几何尺度的关系。针对某型船船的研究表明,船底槽道的引流量是影响减阻效果的主要因素,当采用纵向贯穿的槽道,且槽道顶板的折角点设在船中时,可使原船30节时的减阻率达到24%以上。

Research on Drag Reduction of a Transport Ship with Flat Bow and Transom Stern using Tunnels

Traditional transport ship which with flat bow and transom stern have advantages of large load capacity and shadow draft, but the service speed is low. To reduce the resistance of this type of ships, a longitudinal tunnel was introduced on the bottom of such a ship model, and thus improving the high pressure area of bow. The viscous flow field and ship attitude was simulated by implementing the FVM for the RANS equations. To investigate the effects of tunnel shape on the drag of the hull, a variety of tunnel shapes (with different tunnel length, width, and the top plate form) was used. The results show a 24% reduction in total drag for the modified hull at the forward speed of 30 knot.