复合推进剂气相点火过程的分析与计算

ANALYSIS AND COMPUTATTON OF GAS-PHASE IGNITION PROCESS IN COMPOSITE SOLID PROPELLANTS

关键词:  复合推进剂  点火  数值法和计算方案

Key words:  Composite propellant  Ignition  Numerical method and procedure

摘要:

根据异质推进剂的特点,提出了含氧流动热气体点燃PBAA复合推进剂的气相点火模型。为了详细了解点火过程,进而准确预示点火延迟t-(ig),模型中详细考察了点火期间推进剂表面的分解过程,并利用有限差分法直接求解点火过程的控制方程,获得了点火表面附近的温度和浓度分布与变化曲线。通过与已有实验结果的比较,结果表明,文中提出的理论模型基本合理,计算方法也实用可靠,它们对于深入研究点火问题有一定参考价值。

Abstract:

This paper describes the gas-phase ignition model of composite solid propellants ignited by oxygen-contained flow hot gases according to the characteristics of heterogeneous propellants.in order to understand ignition processes in detail,and to indicate the ignition delay accurately,the decomposition processes on the propellant surface during ignition period were inspected by the ignition model,the control equations of the ignition process were calculated directly with the finite-difference scheme,and distributions of temperatures and concentrations at the vicinity of ignition surface were obtained. By comparison with experimental results,it can be concluded that the theoretical model is basically reasonable, and the calculation method is practical and feasible. Obviously,they are of some value to both theoretical research and practical application of gasphase ignition.