Extinction and growth of cylindrical hotspots in AB model explosive: molecular dynamics studies

10th International Conference on Aerophysics and Physical Mechanics of Classical and Quantum Systems

物理学;力学

Murzov, S.A.^1,2 ; Zhakhovsky, V.V.^2

Moscow Institute of Physics and Technology, Institutskiy Pereulok 9, Dolgoprudny, Moscow Region

141700, Russia^1

Dukhov Research Institute of Automatics, Sushchevskaya 22, Moscow

127055, Russia^2

关键词: Atomistic simulations;    Characteristic time;    Critical radius;    Heating time;    Hot spot;    Hotspot temperature;    Rarefaction waves;    Supercritical;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/815/1/012034/pdf
DOI  :  10.1088/1742-6596/815/1/012034

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Atomistic simulations of a sample with AB model explosive heated quickly up within a small central cylinder were performed with the goal of finding a critical radius of such hotspot. The heating time was chosen to be much shorter than an acoustic time required for rarefaction wave for arriving to the center of hotspot. An isochoric thermal decomposition of AB material evolves inside the hotspot before the arrival of rarefaction wave. We found that the critical radius of such hotspots is determined by the equality of the acoustic time and a characteristic time of isochoric thermal decomposition controlled by initial hotspot temperature. For supercritical hotspots the decomposition of AB material leads to deflagration. The earlier arrival of rarefaction wave extinguishes the chemical reactions in hotspots with the subcritical radius.