Experimental Research On Mutilevel Asymmetric Ventilation Flow Controlof Underwater Vehicle

As a kind of underwater weapon, the submarine has strong concealment, mobility and attack ability.Although the launch process underwater is short, it directly affects stability and the accuracy of the submarine.Due to the impact of speed and cross flow, when the submarinelaunches in the water,the cavityattached on the surface of the submarineare oftenasymmetric.The asymmetry of cavity will result in a bending moment working on the submarine.If the bending moment is too large,it can damage the structure of the submarine and affect the posture of the submarine in the water-exit process. This thesis based on active flow control, using multistage ventilation modeby tunnel experiment widely,we do research on the shape and the hydrodynamic characteristics ofsubmarine.This thesis’ s main research contents are as follows:The underwater vehicle model which is used for tunnel experiment has been designed.Wedesign the new ventilation method and optimiz the experiment scheme.The experimental research on cavity shape of the submarine has been carried out under the condition of multistage asymmetric ventilation.Changes of cavity shape has been analyzed on different ventilation parameters. The law of influence on cavity shape by ventilation volume flow rate, position and ventilation mode has been acquired.The experimental research onfluid dynamics characteristics of the submarine has been carried out under the condition of multistage asymmetric ventilation.The law of influence onfluid dynamics characteristics by the ventilation volume flow rate of asymmetric ventilation holes and froude numberhas been acquired...