下挂式空中发射运载火箭的动网格仿真分析

Analysis of Hanging Type Air Launch Vehicle by Simulation of Dynamic Grid

为实现下挂式空中发射运载火箭机箭安全分离与运载火箭顺利点火,机箭分离轨迹及机箭气动耦合特性的研究十分重要。描述下挂式空中发射分离过程,运用CAD软件构建了机箭系统三维模型;利用CFD动网格技术对分离过程进行了6DOF气动耦合仿真分析。仿真结果显示机箭分离过程中未发生机箭碰撞现象,同时载机与火箭之间的气动耦合对于分离过程的影响是利弊双向的。文中的结论可以为下一步优化设计机箭分离状态参数及火箭控制规律奠定研究基础。

In order to realize safe separation of carrier and houston of hanging type air launch vehicle and the successful ignition of houston, the analyse of separation trajectory and aerodynamic coupling characteristics are very important, The research described the separation process and built the system＇s three dimensional model; the calculation analysed 6DOF aerodynamic coupling characteristics of the sepera- tinn by using CFD dynamic grid. The simulation results showed that there is no collision in the process of separation, also, the aerodynamic coupling had positive and negative effects on separation. The conclusion can lay foundationgs for optimizing seperation＇ s parameters and designing houstong＇ s control laws.