On the Theory of Ignition and Combustion of Micro- and Aluminum Nanoparticles in Dynamic Conditions
The analysis of explosion and detonation processes in a mixture of aluminum dust and oxidizer is of interest due to problems of hazard and application of micro-and nano-aluminum particles in the industry. Mathematical and numerical modeling of ignition, burning, and detonation processes in dust suspensions is commonly based on approaches of reactive heterogeneous media mechanics. The investigation of aluminum dust suspensions ignition under dynamical conditions behind the passing shock waves is proposed in the first part of this paper. The mathematical model of shock ignition of a mixture of small solid particles and gas is presented. The model takes into account the particle melting and chemical reactions of low-temperature surface oxidation with regard for polymorphic transformation of the oxide. The conditional ignition temperature in the models ignoring the reactions of ignition and melting is determined on the base of comparison of the ignition delay time and time of temperature equilibrium breaking. The dependencies of conditional ignition temperature on the key parameters are investigated. The calculated ignition delays correlate with known experimental data on aluminum dust ignition in shock and detonation waves. The aluminum nanoparticle burning problem under the action of reflected shock wave is considered in the second part of the paper. The pointwise mathematical model is proposed to describe the aluminum nanoparticle burning. The model makes it possible to satisfactorily describe the burning time within the range of initial pressures from 8 atm to 32 atm and particle temperatures from 1200 K to 2200 K for the relative oxygen content in the ambient gas mixture from 10 to 50%.
FEDOROV Aleksandr V. KHMEL Tatyana A.
Khristianovich Institute of Theoretical and Applied Mechanics SD RAS,630090,Novosibirsk,Russia
国际会议
2011 International Autumn Seminar on Propellants,Explosives and Pyrotechnics(2011国际推进剂、炸药、烟火技术秋季研讨会)
南京
英文
832-840
2011-09-20（万方平台首次上网日期，不代表论文的发表时间）