On the mechanisms and criteria of deflagration-to-detonation transition in gases

All-Russian Conference with the School for Young Scientists “Thermophysics and Physical Hydrodynamics –2016”

Kiverin, A.D.^1 ; Yakovenko, I.S.^1 ; Ivanov, M.F.^1

Joint Institute for High Temperatures, Russian Academy of Sciences (JIHT RAS) 125412, Izhorskaya st. 13 Bd.2, Moscow, Russia^1

关键词: Auto-ignition;    Combustible mixture;    Combustion kinetics;    Combustion of hydrogens;    Deflagration to detonation transition;    Initial state;    Supersonic combustion;    Supersonic flames;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/754/5/052002/pdf
DOI  :  10.1088/1742-6596/754/5/052002

来源: IOP

【 摘 要 】

The origins of different supersonic combustion regimes in channels are discussed. It is shown that the evolution of supersonic flames including the formation of quasi-steady supersonic flames, transition to detonation directly at the flame front and auto-ignition inside the kernels at some distance ahead the flame front are fully determined by the same gasdynamical effects and peculiarities of combustion kinetics. Three basic criteria are formulated aiming to establish correlation between the initial state of the gaseous combustible mixture and the possibility of deflagration-to-detonation transition. Formulated criteria are in an adequate agreement with the data on combustion of hydrogen-based mixtures.