Study On Flow Field Characteristics Of Rotational Body With Angle Of Attack During Water Fall

During the water fall of rotational body with angle of attack and initial velocity of horizontal is non-powered carrier falling, missile air ignition failure falling, missiles and other isolates falling reflect the real physical problems. And hydrodynamic properties and trajectory characteristics of during the water fall of rotational body with angle of attack and initial velocity is the basic to research non-powered carrier falling, missile air ignition failure falling, missile isolate falling smashing the submarine. Therefore, carrying out the water falling experiment of rotational body with angle of attack, analysis hydrodynamic properties and trajectory characteristics of rotational body during water falling, provide reference basis for the design and launch missiles.At the begin Froude similarity criteria be used to scale the shape of simplified reference missile to give the experimental model’s geometric parameters, dynamic parameters and motion parameters. Cartesian coordinate system be used to describes the strength of rotational part, and the kinetics mathematics model is established to estimate the force. Design reliable experimental apparatus and experimental feasible methods to ensure the repeatability of each experiment.We carried out rotational part vertical water falling experiment by the High-speed imaging method, and we have obtained the motion laws of rotational part center of mass, the strength of rigid and water falling cavity. And also carried out the water falling experiment of rotational part with different initial velocity of horizontal and attack angle, then analysis of cavity shape feature, centroid trajectory variation, horizontal velocity and vertical velocity variation laws, and lift and drag characteristics during water falling. Analysis of the drowning process rotator attitude angle, angular velocity and angular acceleration variation rules.The state before touching the free surface of rotational body consists of initial velocity of horizontal, initial velocity of vertical and angle of attack. Then we Carried out experiments about increased the vertical initial velocity of rotational body, we analyzed the trajectory characteristics and dynamics of cavitation of rotational body vertical water falling and with different initial velocity of horizontal and different angle of attack. Comparative researched the water falling cavity and centroid trajectory variation which has same angle of attack and initial velocity of horizontal.