Simulation of Supersonic Stage Separation of Capsule-Shaped Abort System by Aerodynamic Interaction

摘要

Abort separation of the capsule-shaped abort system boosted by supersonic aerodynamic interferences is studied by experiment and CFD. The objective of this study is to examine the effects of aerodynamic interaction on the abort process between two bodies: a capsule and a rocket. For this problem, four models are considered; model A has no disk, model B-l has a disk, and model B-2 and B-3 have one and two fences, respectively, in addition to a disk. The capsule is modeled by a cone as a Launch Abort Vehicle (LAV), and the rocket by a circular cylinder as a Service Module (SM). To enhance the abort separation, a disk and a fence are installed in order to increase the thrust force acting on the capsule, and their effects are investigated by experimental measurements and numerical simulations. The effects of aerodynamic interaction during an abort separation are examined from static and dynamic simulations for various separation distances. The role of fence vanishes and the effect of disk becomes very weak when the non-dimensional separation distances are larger than 0.6 and 0.8, respectively. For this reason, the capsule has a return in the case with disk when the separation distance is more than 2.0. However, the capsule has no possibility of recontact with the rocket due to the strong interferences.