过氯酸铵 (AP) 爆燃的模拟

本文提出一个描述AP爆燃的物理化学模型,并计算了AP晶粒在10～800大气压下的爆燃速度、压力指数、燃面温度等参数值,计算结果和T.L. Boggs等人的实验结果相符文中提出AP爆燃过程中,在低压和高压下,可能存在着两种不同的凝聚相反应机理,并用以解释Boggs的实验现象。此外,本文还提出了一种描述绝热体系中,预混火焰燃烧时的化学反应速度表示式和计算方法,使气相温度梯度及热传导的计算简单合理,这也是本模拟研究取得成功的因素之一。

Modeling Investigation of Self Deflagration of Ammonium Perchrolate

A physiochemical model of the self-deflagration of pure single crystal ofammonium perchlorate (AP) has been developed in this paper. The values ofthe self-deflagrating rate. pressare exponent and burning surface temperatureat the pressures between 10 and 800 atm are calculated. The resucts are ingood agreement with the experimental data made by Boggs. The calculations are based apon the assumptions that the decompositionof crgstal AP follows two competitive process. At low pressures, AP melts atfirst, decomposes and then the products react each other in the condensed phaseaccompanying with the generation of heat. The exothermic reaction in thecondensed phase is the main heat source of Ap deflagration at low pressuress.And at the high pressares, the beat transferred from the gas phase to theburning surface increases rapidly, forming the direct decomposition andvaporization of crystal Ap. The regularity of burning rate changing with the pressure obtaind by Boggs' experiments can be clearly illustrated from theseassumptions and calculations. This paper also uses a kind of new chemical reaction rate expression(?) (T is "temperature") to describe the Ap deflagration and presents thecalculation method. This new expression facilitates the calculation of gaspbase temperature gradient and makes the theoretical modeling succeed.