鳞鲀模式推进机理的数值研究  

The numerical study on the propulsive mechanism of balistiform

作　　者：张睿谦 胡文蓉[1,2,3] ZHANG Rui-qian;HU Wen-rong(Department of Engineering Mechanics,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Jiao Tong University and Chiba University International Cooperative Research Center(SJTC-CU-ICRC),Shanghai Jiao Tong University,Shanghai 200240,China;MOE Key Laboratory of Hydrodynamics,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 [2]上海交通大学与千叶大学国际合作研究中心,上海200240 [3]水动力学教育部重点实验室,上海200240

出　　处：《水动力学研究与进展（A辑）》2020年第2期258-265,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(11472173)。

摘　　要：通过求解三维非定常不可压缩N-S方程对鳞鲀模式的游动进行了数值模拟,研究了鳞鲀模式游动的水动力学特性与流场特征,揭示鳞鲀模式游动的推进机理。结果表明,鳞鲀的背/臀鳍在一个波动周期内脱出两个非对称涡环,涡环中心诱导射流为鳞鲀提供推力;鳞鲀的推力分别依靠鳍面的波动和横侧摆动产生,背/臀鳍的安装角度使鳞鲀能更有效地利用这两部分的推力分量,且平衡沉浮力分量。鳞鲀所受推力随波动频率和幅度的增大而增大,随波长的增大先增大后减小,并且波长过大时,推进效率会急剧降低。相比于身体-尾鳍摆动(BCF)推进,鳞鲀模式具有极高的推进效率。与长鳍扭波推进模式相比,鳞鲀模式则具有更强的机动性。The three-dimensional unsteady incompressible N-S equations were solved to simulate the swimming of balistiform.The hydrodynamic performance and flow field characteristics of balistiform were studied.And the propulsion mechanism of balistiform was explored.The results show that two asymmetric vortex rings are shed from the dorsal/anal fins of the balistidae in an undulating period.The center of the vortex rings induce the backward jet to produce the thrust.The thrust comes from two parts:one is generated by the undulation of the middle-fins surface,the other is generated by the lateral swing of the median-fins surface.Furthermore,the maximum thrust component and force balance of the heave forces benefit from the mounting angle of the median fins.The thrust of the balistidae is increased with the increasing of the frequency or amplitude of the undulation,while the thrust increases at first and then decreases with the increase of the wavelength.When the wavelength is too large,the propulsive efficiency will decrease sharply.Balistiform has a very high propulsive efficiency compared to the body-caudal fin(BCF)mode.And compared to the propulsion mode of slender fin’s undulation,balistiform is more maneuverable.

关 键 词：鳞鲀模式 空间涡结构 数值模拟 

分 类 号：O35[理学—流体力学]