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在火药燃速预估模型的基础上，分析了硝胺炸药热分解机理，提出了硝胺燃烧初期热分解反应的假设，对燃烧表面气相组成进行了分类，推导了硝胺发射药燃速公式和压力指数公式。将硝胺发射药燃速表达为燃烧室压力和发射药组成的函数。对硝胺含量、种类不同的发射药的燃烧性能进行了数值模拟。计算值与实测数据十分吻合。最后讨论了硝胺发射药燃速压力指数全程特征和压力指数调节的可能性。认为燃烧表面附近Ｎ２Ｏ气体氧化性活化和硝胺化学结构中缺少可裂解自由基是硝胺发射药燃速－压力曲线转折和压力指数大于１的原因。
On the basis of the predictive model of burning rate of gunpowder, the mechanism of thermal decomposition of nitramine explosives was analyzed. The hypothesis of initial thermal decomposition reaction of nitramine was proposed. The gas phase composition of combustion surface was classified. The formula of burning rate of nitramine propellants was deduced. And pressure index formula. The nitramine propellants burn rate is expressed as a function of combustor pressure and propellant composition. The combustion performance of propellant with different contents and types of nitramine was numerically simulated. The calculated value is in good agreement with the measured data. Finally, the possibility of adjusting the full-scale pressure and pressure index of the burning rate pressure index of nitramine propellants is discussed. It is considered that the oxidative activation of N2O gas near the combustion surface and the absence of cleavable free radicals in the nitramine chemical structure are the causes of the burning rate-pressure curve transition of nitramine propellants and the pressure exponent greater than one.