Numerical Simulation Of Weapon Separation Based On Unstructured Overset Grid And CFD/6DOF Method

The initial trajectory of wing/store separation has an important influence on the safety of thewing. It is shown that the motion of two objects is an unsteady problem. This paper develops CFDtechnology combined with six degree of freedom coupling solving method under the condition of thecomplex flow, in order to simulation and analysis of the trajectory of stores away from the pylons. Inthis paper, quaternion method is also used to solve six degree of freedom motion equations anddynamic equations, and which successfully resolves the singularity problem in the large Angle ofattack situation. At last, we improve the six degrees of freedom movement module embedded in theCFD software, which perfects the CFD solving method. In addition, the example validation of missilemodels was calculated in the steady flow field, and there is good agreement between the numericalresults and the experimental value, it suggested that the fluid equations of CFD software and nestedgrids technically which research group developed were correct and feasible. On this basis, this paper,under unsteady flow field conditions, also combined six degrees of freedom simulation module withCFD software and analyzed the situation of missile projectile, trajectory, etc., including thewing/pylon/store separation and the bomb bay missile ejection. In this study, bomb bay missileseparation also was simulated by CFD/6DOF method, which analyzed the security separation ofAIM-120c missile. It is a great practical significance to aircraft canopy or tank separation, missilelaunch engineering problems.