Aerodynamic Interference Investigation For Dispensing And Separation Of Cluster Munition

Both wind tunnel experiment and numerical simulation were applied to study aerodynamic interference characteristics during dispensing and separation, which is one of the most important key problems in studying and developing cluster munition.A cluster munition model with shell body cavity and experiment scheme were designed. In the wind tunnel test, three scenarios were considered. One of them was that cluster munition's cabin was opened, the other was dispensing all submunitions simultaneously, and the last was that submunitions were dispensed sequentially. Interference flow field and aerodynamic parameters were collected during the test. The data was important for numerical simulation and engineering design.Numerical simulation methods and theory were analyzed to simulate disturbing flow field on separation of supersonic cluster munition. Since the cluster munition's shape is irregular during dispensing, hybrid grids technology was adopted to carve up grids. In order to improve calculation precision, Reynolds-averaged Navier-Stokes equations and finite volume AUSM+ discretization format were employed, and S-A one formulation turbulent model for the cluster munition without cabin, and k-ωSST two formulation turbulent model for the separation of cluster munition. Computed results were compared with experiment data and were found to be in good agreement with the data.According to the results abtained from wind tunnel experiment and numerical simulation on cluster munition without cabin, interference flow field of munition without attack angle and with attack angle was studied. Parameter distribution of flow field was described by some figure, the pressure distribution on the surface of shell body and vortex located in the joint of adjacent submunitions were analyzed. The result showed that aerodynamic parameters and submunition separation were affected by the difference of munitions attack angle.Flow characteristics of submunition dispensing simultaneously were investigated. Some attention was paid to the flow characteristics and aerodynamic disturbing property of the carrier with different attack angle. The vortex located in shell body cavity was obtained. The valuable aerodynamic parameters for engineering application were proposed.Flow characteristics of submunition dispensing sequentially were investigated systemically. Based on the computation results after the first sequential submunition dispensed, the appropriate dispensing interval was obtained. Then the aerodynamic interference property of submunition with different attack angle and different dispensing interval was introduced. The direction to design dispensing sequence of cluster munition sequential dispending was presented.