双基推进剂热分解反应动力学参数的计算

THE COMPUTATION OF THE KINETIC PARAMETERS OF THERMAL DECOMPOSITION REACTION OF DOUBLE-BASE PROPELLANT

关键词:  双基推进剂  热离解  量热器  参数估计

Key words:  Double base propellant  Thermal dissociation  Calorimeter  Para-meter estimation

摘要:

本文根据在CDR-1型热分析仪上测得的一条非等温DSC曲线,确定了双基推进剂热分解反应的最可几机理函数,提出了计算三个动力学参数(E,A和n)的数值方法.该法用线性最小二乘法、迭代法以及二分法与最小二乘法相结合的方法,以积分方程、微分方程和放热速率方程拟合实验数据.在逻辑选择建立了微分形式或积分形式的机理函数的最可几一般表达式后,用放热速率方程计算相应的动力学参数E,A和n的值.

Abstract:

The determination of the most probable mechanism function and a numerical method of computing three kinetic parameters of thermal decomposition reaction of double-base propellant by a single non-isothermal DSC curve are reported. Thedata are fitted to the integral, differential and exothermic rate equations by linear least-squares, iterative, combined dichotomous and least-squares methods, respectively. The apparent activation energy, pre-exponential constant, reaction order and the most probable mechanism function (integral form) of thermal decomposition reaction of double-base propellants DP-1 and DP-2 obtained by the logical choice method are 147.85 and 156.06kJ·mol-1 , 1013·6 and 1014·4 s-1,.0.78 and 0.54, 1-(1-α)1/4 and 1-(1-α)1/2, respectively.