鳞鲀模式转弯机动的机理研究  

Study on Mechanism of Balistidae Turning Maneuver

作　　者：吴长云 胡文蓉[1] Wu Changyun;Hu Wenrong(Department of Engineering Mechanics,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院工程力学系,上海200240

出　　处：《水动力学研究与进展（A辑）》2023年第3期440-449,共10页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(12272233)。

摘　　要：该文针对中鳍波动驱动下的鳞鲀模式转弯机动,开展了鳞鲀模式转弯运动过程数值模拟仿真研究,揭示了鳞鲀模式转弯机动的水动力学机理,探讨了不同控制参数对转弯性能的影响规律。研究发现:中鳍的非对称运动脱出了两列非对称涡,同时在附加惯性效应的共同作用下,鳞鲀两侧产生了横向的压差力,在中鳍表面的压差力会形成转向力矩,促使鳞鲀转弯;而鳞鲀尾鳍的压差力则会阻碍转弯,因此适当收缩尾鳍可减小转弯半径,从而提高鳞鲀转弯能力。中鳍波动的参数对转弯有明显的影响,波动频率的增大会使鳞鲀稳定速率显著增大,但对转弯半径的影响相对较小;波动波长和偏角的增加,则会减小鳞鲀转弯半径,增强转弯性能,但对转弯速度的影响不大。In this paper,the numerical simulation of the turning maneuver of the Balistidae with the fluctuation of the median fin is carried out,and the hydrodynamics of Balistiform is explored.It is found that the asymmetrical movement of the median fin broke out of two rows of asymmetric vortices,together with additional inertial effects,forming lateral pressure difference on both sides of the fish.The pressure difference on the surface of the median fin generates a turning moment which causes the turning but the pressure difference on the caudal fin hinders the turning.Properly shrinking the caudal fin can reduce the turning radius and improve the turning performance.The fluctuation parameters of the median fin have significant impacts on turning.The increase of the fluctuation frequency can increase the turning speed of Balistidae,but has less effect on the turning radius.And the increase of the wavelength and the declination can reduce the turning radius to improve the turning performance,but have less effect on the speed.

关 键 词：鳞鲀模式 转弯机动 数值仿真 

分 类 号：O35[理学—流体力学]