Structure Design And Separation Flow Field Simulation Of Large Diameter Submunition

In the modern wars, the main targets of battlefield are tanks and infantry fighting vehicles. For these group targets, the damage area and operational effects of general warhead can’t meet with the requirements. To enlarge lethal area and improve operational effects, cluster warhead is more popular.For the article studies the dispersion of large-caliber cluster munition, the central tube bursting-type is chose as the method for dispersing. According to the operation principle of the central tube bursting-type, the general parameters of dispersing structure are designed. Based on the classic interior ballistic theory, the theoretical model in the throwing procedure of central tube bursting-type has been established. Then the ballistic performance curves of this system are got using a simulation method, through the analysis of orthogonal experiment, the influences of charge weight of propellant, the allowable pressure of central tube and the volume of drug room on the velocity of submunitions are got. And the result shows that the influence of the allowable pressure of central tube on the velocity of submunitions is more. This can provide the basis for the constructional design of large-caliber cluster munition.To verify the reliability of the structure, numerical simulation methods are analyzed to simulate disturbing flow field on separation of cluster munition.The article realizes mesh generation with hybrid grids, and mesh movement strategy is implemented by the combination of mesh deforming and local remeshing. Then fluid equations are coupled with 6 degree of freedom trajectory equations of bullet by UDF programming to simulate the disturbing flow field on separation of large caliber cluster munition. The article analyses flow characteristics of submunition dispensing in different situations, such as different initial dispersing velocities, different axis angels between munition and submunition, different free stream mach number and different shapes and lengths of munition warhead. Finally, flow characteristics of submunition dispensing sequentially are investigated. All the results can provide the basis for the constructional design of large caliber cluster munition.