Dynamic ignition regime of condensed system by radiate heat flux

5th International Congress on Energy Fluxes and Radiation Effects 2016

Arkhipov, V.A.^1 ; Zolotorev, N.N.^1 ; Korotkikh, A.G.^1,2 ; Kuznetsov, V.T.^1

Research Institute of Applied Mathematics and Mechanics, Tomsk State University, 36 Lenin Ave., Tomsk

634050, Russia^1

Institute of Power Engineering, Tomsk Polytechnic University, 30 Lenin Ave., Tomsk

634050, Russia^2

关键词: Ambient conditions;    Condensed systems;    Constant temperature;    Critical condition;    Dynamic condition;    High energy materials;    Ignition characteristics;    Stationary conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/830/1/012136/pdf
DOI  :  10.1088/1742-6596/830/1/012136

来源: IOP

【 摘 要 】

The main ignition characteristics of high-energy materials are the ignition time and critical heat flux allowing evaluation of the critical conditions for ignition, fire and explosive safety for the test solid propellants. The ignition process is typically studied in stationary conditions of heat input at constant temperature of the heating surface, environment or the radiate heat flux on the sample surface. In real conditions, ignition is usually effected at variable time-dependent values of the heat flux. In this case, the heated layer is formed on the sample surface in dynamic conditions and significantly depends on the heat flux change, i.e. increasing or decreasing falling heat flux in the reaction period of the propellant sample. This paper presents a method for measuring the ignition characteristics of a high-energy material sample in initiation of the dynamic radiant heat flux, which includes the measurement of the ignition time when exposed to a sample time varying radiant heat flux given intensity. In case of pyroxyline containing 1 wt. % of soot, it is shown that the ignition times are reduced by 20-50 % depending on the initial value of the radiant flux density in initiation by increasing or decreasing radiant heat flux compared with the stationary conditions of heat supply in the same ambient conditions.