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传热学
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ISSN 打印: 1064-2285
ISSN 在线: 2162-6561

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传热学

DOI: 10.1615/HeatTransRes.v38.i2.70
pages 171-184

Analytical Method for Calculating Time Characteristics of Ignition of Hybrid Gas Suspensions by a Hot Body

B. S. Seplyarskii
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
S. V. Kostin
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
T. P. Ivleva
Institute of Structural Macrokinetics and Problems of Material Science, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation

ABSTRACT

Approximated analytical and numerical methods were used to investigate regularities of ignition of hybrid gas suspensions by a hot body. It was shown that ignition can occur in three different modes: kinetic, diffusion, and transition. A parametrical region for implementation of each of the possible ignition modes was determined. It was found that transition from the kinetic to diffusion mode occurs with changes in the heater temperature by only one characteristic interval and can be accompanied by a jumpwise decrease of both the ignition delay time and the amount of energy required for initiation of the ignition process. For the kinetic mode, the wave theory of ignition was used to obtain, for the first time, analytical expressions for computation of time characteristics of ignition. It was shown that the impact of addition of combustible gas on the ignition regularities was high for both large and very small values of the parameter Z, the analogue of the Semenov criterion. For the first time, an approximate formula was proposed to calculate time characteristics of ignition over the entire range of variation of the parameter Z. Numerical calculations showed that the error of determination of time characteristics of ignition using the approximate formula did not exceed 45%.


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