Research On Multiphase Flow Characteristics Of Continuous Vertical Launch Of Underwater Vehicles

With the continuous development of submarine technology,submarine launched missiles have become an important strategic and tactical force.In order to ensured the accuracy and continuity of strategic strikes,it is the trend of the development of submarine-launched weapons in the future to study the continuous vertical launching technology of underwater vehicles on the basis of traditional submarine-launched weapons.In this background,the paper studied the underwater continuous vertical launch process of the vehicle by means of numerical simulation and experiment,and focused on the interference problems during the two vehicles.Based on the multi-phase flow model,The three-dimensional numerical simulation of the two vehicles launching from the launcher is completed by using the fluid simulation software,and the characteristics of the flow field of the nozzle and dynamic characteristics at the stage of motion were studied after vehicles launched.Considering the flow,the pressure change rules of the surface and motion characteristics of the navigation body were analyzed.The experiment system of continuous vertical launching of underwater vehicle was designed independently,and by which the launching experiment of single and double underwater vehicles was completed.In the paper,the cavity shape changes during the launch of a single vehicle were first studied,and the phenomenon of backjet flow,the movement characteristics of the vehicle and the water hammer effect after the vehicle launched were analyzed,and the variation of cavity shape and motion trajectory under the influence of flow were concluded.Comparing the characteristics of multiphase flow field during the launching process of two vehicles whose head-shape were hemispheric and tapered,the paper analyzed the trajectory of two vehicles,the features of cavity shape,the change rules of cavity diameter,length and the deflection Angle,and studied the effect of launch speed,flow speed and launch time interval between two vehicles on the process of continuous launch.