Combined Asymptotics and Numerical Methods in Transonic Store Interactions.

摘要

Combined asymptotic and numerics procedures were coupled with dynamics equations to simulate two and three-degree of freedom store separation from cavities. New solutions were obtained that provide insight into how the shear layer can interact with the body motion and cause re-contact and ricochet with the parent body. The theoretical models simulated these phenomena by adjustment of initial launch conditions such as initial plunge and pitch velocities among other lumped groups. Details of the structure of the near and far fields of the separating store were obtained by a combination of asymptotic analysis and function theory. Trajectory bifurcation producing a quick transition from one pitch trajectory to another was correlated with shear layer interactions and our experiments. This also produced a jump in the phase of oscillatory pitch. Transonic flows were considered and the significance of wave drag to the trajectory history was assessed within the nonlinear framework of Karman-Guderely transonic small disturbance theory.