Research On Controlled Safety Recovery Technology For Launch Vehicle Booster

The booster of Long March launch vehicle lands freely after separated, it’s dangerous to rhe personal and property safety and has blocked the trajectory design and optimization of launch vehicle. General design of controlled safety and the booster’s recovery system, the technology of design of large parafoil, the analyses of booster re-entry dynamics and attidude were researched in this paper to solve some safety problems of the landing area,Navier-Stokes equation and Chimera/Overset method were used to analyze the aerodynamic characteristics of separated booster during the re-entry segment, and the attitude of separated booster during re-entry segment was simulated. Because the structure requires high bearing capacity during re-entry segment and landing segment, the load characteristics and the damage form of the structure were analyzed.The composition of parafoil system of launch vehicle booster was analyzed, the design scheme of parafoil recovery system was introduced, the dynamics model of parafoil was established and the design and servo-control of large parafoil were researched.The location optimization of recovery system in booster and the design scheme of booster nose-cone separation were introduced. The effect on launch vehicle loading capacity by parafoil recovery system, additional requirements for separation system and structure bearing capacity were analyzed.The safety problems of booster landing area were solved preliminarily by controlled safety recovery technology. The foundation to achieve the controlled safety recovery technology of launch vehicle separated bodies in the future was established.