仿生双尾推进的试验研究

针对单尾鳍摆动推进存在的机器鱼摇艏问题,理论分析了仿鱼尾鳍摆动过程中推力系数和侧向力系数的脉动情况,设计出仿生双尾推进器,并将其应用于小水线面双体船,开发出新型仿生双尾推进水上试验平台,同时,根据鱼类高效推进的机理,分析了仿生双尾推进器尾涡的相互影响.实验研究结果表明仿生双尾推进的尾鳍摆动频率和摆幅对推进性能影响较大,其中幅值的影响更加明显,月牙形尾鳍具有更高的推进效率.仿生双尾利用并发挥仿鱼推进的优点,具有良好的推进和操纵性能.

Experimental research on a bionic propulsor with double tail-fins

To understand the causes of forebody swing in robotic fish with a single tailfin,changes of thrust and transverse force coefficients of bionic tailfins were analyzed.A robotic fish with two tailfins was designed to simulate the tail swing of Tunny,and was used in a SWATH ship.A new experimental platform for a propulsor with double tailfins was developed.Next,the wake of the double tailfin propulsor was compared with that of highly efficient fishes.The relationship between the speed and resistance of a robotic fish and its thrust under bollard conditions was tested experimentally.The experimental evidence on double tail-fin propulsion reveals that the swing frequency and amplitude of the tail-fin imposes more influence on the performance of double tailfin propulsion,especially on the amplitude.Lunate tailfins are more efficient than the rectangle type.Double tail-fin propulsion not only makes full use of bionic propulsion,it overcomes the problems of swing in the forebody and the low efficiency of single tailfins.