振动障碍物型式对摆动尾鳍水动力性能影响研究  

Study on the influence of vibration obstacle type on the hydrodynamic performance of flapping caudal fin

作　　者：舒蒋鹏 杨文俊[2] 石小涛[1] 陈小龙 胡晓[1] 谭均军 张立胜 SHU Jiang-peng;YANG Wen-jun;SHI Xiao-tao;CHEN Xiao-long;HU Xiao;TAN Jun-jun;ZHANG Li-sheng(College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,China;Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]三峡大学水利与环境学院,宜昌443002 [2]长江科学院,武汉430010

出　　处：《计算力学学报》2024年第6期1037-1044,共8页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金面上项目(52279069);国家自然科学基金(52179070)资助项目.

摘　　要：基于计算流体力学(CFD)方法并结合Fluent的动网格技术,对不同振动障碍物产生的尾流场中摆动尾鳍的水动力性能进行了研究。通过改变尾鳍前缘与障碍物中心点距离(S)、障碍物大小(d)和来流速度(U)获得了摆动尾鳍的平均推力系数、功率消耗以及推进效率的变化趋势,并结合流场的压力分布云图以及涡量云图进行了分析。计算结果表明,障碍物的存在可以提升摆动尾鳍的推进性能。在固定S,d和U下,在振动方柱尾流中摆动尾鳍的最大平均推力和最大推进效率均高于其在振动D形柱和圆柱尾流中的最大平均推力和最大效率。障碍物为D形柱、圆柱以及方柱时,旋向相反的D形柱涡、圆柱涡以及方柱涡与尾鳍前缘涡产生挤压作用,提升尾鳍前缘涡的强度。Based on computational fluid dynamics(CFD)methods combined with Fluent's dynamic mesh technology,the hydrodynamic performance of a flapping caudal fin in its wake fields generated by different vibration obstacles was studied.The average thrust coefficient,power consumption and propulsion efficiency of the flapping caudal fin were obtained by changing the distance between the leading edge of the caudal fin and the center point of the obstacle(S),the size of the obstacle(d)and the incoming flow velocity(U),and the analysis was conducted based on the pressure distribution contour and vortex contour of the flow field.The calculation results show that the presence of obstacles can improve the propulsion performance of the flapping caudal fin.Under fixed S,d and U,the maximum average thrust and maximum propulsion efficiency of the flapping caudal fin in the wakes of a vibrating square cylinder were higher than its maximum average thrust and maximum efficiency in the wakes of a vibrating D-shaped cylinder and cylinder wake.When the obstacles are of a D-shaped cylinder,cylinder and square cylinder,the vortex of the opposite D-shaped cylinder,cylindrical vortex and square cylinder vortex and the leading edge vortex of the caudal fin produce an extrusion effect to increase the strength of the leading edge vortex of the caudal fin.

关 键 词：摆动尾鳍 振动障碍物型式 动网格 水动力性能 数值模拟 

分 类 号：TP24[自动化与计算机技术—检测技术与自动化装置] O35[自动化与计算机技术—控制科学与工程]