Numerical Study for Base Drag Reduction Using Boattail Shape Afterbodies for Launcher Vehicles in the Supersonic Turbulent Flow

초음속 난류 유동장에 놓인 보트테일 형상 발사체 후방동체 기저 항력 감소에 대한 수치적 연구

Numerical analysis for pressure drag on boattail afterbodies have been studied by Mach number, boattail angle and length ratio of body diameter and base diameter using CFD-FASTRAN that the commercial external flow CFD code. The numerical results have been compared with the experimental data that have been shown pressure drag reduction and supersonic turbulent flow characteristics for boattail afterbodies. And the prediction equation tot boattail base drag has been made by the numerical results about Mach number and boattail configuration parameters.