摘要
以依靠长背鳍推进的“尼罗河魔鬼”为研究对象,对弓鳍目模式推进进行了研究。在“尼罗河魔鬼”巡航游动试验的基础上,通过对鱼体几何形态和柔性长背鳍波动的运动学分析,建立了“尼罗河魔鬼”长背鳍波动推进的简化运动学模型,并利用大摆幅伸长体理论分析了长背鳍波动推进的水动力学特性。计算表明:“尼罗河魔鬼”在0．728～0．985身长／s的速度范围内,长背鳍波动推进的水动力学效率介于81．664％-86．420％之间,表明长背鳍波动推进游动是一种适应水中环境的高效游动模式。
The kinematics of steady forward swimming of Gymnarchus niloticus are described. The geometric features of the body and locomotive characteristic and parameters of the flexible dorsal fin are discussed. A simplified kinematic model on locomotion of the undulatory long dorsal fin propulsion is based on the the observation and experimental data. The hydromechanical performances of the undulatory long dorsal fin propeller of Gymnarchus niloticus are estimated applying the large-amplitude elongated-body theory. The hydromechanical efficiency of the undulatory long dorsal fin system ranged from 82.284% to 87.455% over a speed rang of 0.728～0.985 lengthe.s^-1. It is suggested that the undulatory long dorsal fin propulsion is an adaptation to swimming with high hydromechanical efficiency.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2006年第3期88-92,共5页
Journal of Mechanical Engineering
基金
国家创新基金资助项目
关键词
长背鳍
波动推进
运动学模型
水动力学效率
Dorsal fin
Undulation
Kinematic model
Hydromechanical efficiency
