The model experiment of a new-type double tail-fin robotic fish propulsion

To avoid the swing of forebody of robotic fish with single tail-fin,a kind of robotic fish with double tail-fin was designed and was used in SWATH.The experimental platform of double tail-fin proprulsion was produced and the experimental research of the double tail-fin propulsion was made in a pond.As a result,the double tail-fin propulsor as a new-type propulsor not only can solve the shakable problem of the single tail-fin robotic fish when it's swimming,but also has excellent propulsive efficiency and maneuverability.The CFD software FLUENT was used to calculate the unsteady flow characteristic of the swinging tailfin.According to the different flow characteristic between the single tail-fin and the double tail-fin,the author analyzed the mutual interferential problem during the swing process of the double tail-fin.The numerical simulation of the tail-fin field shows that it is beneficial that the two tail-fins of double tailfin robotic fish propulsion interfere with each other while swinging in the low frequency.