摘要
本文研究了航天飞机再入大气层三维机动飞行时所产生的最大过载及驻点的热流峰值,提出了一种计算最大过载及热流峰值的解析方法。在一阶近似运动方程的基础上,建立了最大过载、热流峰值与航天飞机的升阻比、再入角、滚转角等参数之间的解析关系式,由之可简便地确定最大过载与热流峰值。文中分析了升阻比、再入角等参数对过载和热流的影响,并与再入三维轨道精确解的相应值作了对比,表明此种解法具有一定的精度,可供再入三维轨道特性的分析及航天飞机的初步设计阶段使用。
In this paper, the maximum load factor and the peak convective heating rate for the space shuttle entering the Earth's atmosphere are studied, and the analy tical method to compute the maximum load factor and peak heating rate is presented. Based on the first-order approximate equations of motion,the analytical relations of maximum load factor and peak heating rate with the lift-to-drag ratio, reentry angle and bank angle etc. are derived, and with which the maximum load factor and peak heating rate may be obtained conveniently. Then the effects of lift-to-drag ratio and reentry angle etc. on the load factor and heating rate are analyzed. The results are compared with the exact solutions of three-dimentional reentry trajector. It is shown that this method has a certain accuracy and may be used for analysing the character of three-dimentional reentry trajectories and for the preliminary design of space shuttles.
基金
国家863航天高技术研究项目
关键词
航天飞机
再入
过载
热流量
space shuttles, reentry trajectories, maneuvering flight, load-factor, heating rate
