基于二次流能量法的最小阻力船型研究

Research on Minimum Resistance Hull Form Based on Secondary Flow Energy Method

船体尾部流场速度场的横向和垂向分量是导致粘性阻力增加的根本原因,为了获得最小总阻力船型,以船体尾部区域为优化设计对象,以YZ方向的二次流能量最小为目标函数,以样条函数的参数为设计变量,在保证排水量为基本约束条件下,根据实际情况附加其它约束条件来控制尾部形状的变化,采用非线性规划法进行优化设计。通过集装箱船的优化算例,证实了采用该方法进行船型阻力优化的可靠性。

The transverse and vertical components of the velocity field in the stem area are the prime source of resistance increasing. In order to obtain the minimum resistance hull form, tanking the stem shape as the optimization objective, the energy of secondary flow of the y and z directions as the objectives function, the parameters of B-spline function as the design variables, the appropriate displacement as the basic constraints and the allowable variation of stem shape as an additional constraint, the design is optimized with nonlinear programming （NLP）. The optimization examples for full-scale container ships are provided, which confirm that the resistance is reduced distinctly by this optimal design method.