|Author||Lyubchenko, V. I. ♦ Marchenko, G. N.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ CONDENSED AROMATICS ♦ COMBUSTION ♦ IGNITION ♦ CONDENSED CYCLOALKANES ♦ CALCULATION METHODS ♦ TEMPERATURE GRADIENTS ♦ ALKANES ♦ AROMATICS ♦ CHEMICAL REACTIONS ♦ CYCLOALKANES ♦ HYDROCARBONS ♦ ORGANIC COMPOUNDS ♦ OXIDATION ♦ THERMOCHEMICAL PROCESSES 400800* -- Combustion, Pyrolysis, & High-Temperature Chemistry|
|Abstract||For the model of combustion of a condensed substance with a constant surface temperature, it is known that two conditions must be fulfilled simultaneously in order for ignition to take place. The surface temperature must be equal to some given value, and the magnitude of the temperature derivative on the surface of the substance must be less than a critical value. However, if the temperature gradient on the surface is sufficiently small, this will lead to unstable combustion of the substance and hence to the absence of any stable regime of ignition. In the model of combustion of a substance with variable surface temperature, there are also critical temperature gradients; a large temperatue derivative on the surface (above the critical) leads to a small thickness of the heated layer, an inadequate reserve of heat in this layer (absence of ignition), and a small temperature gradient on the surface (below the critical) leads to a broad zone of chemical reactions and breakdown of the conditions for modeling the ignition process. The present work has been aimed at developing calculative methods for determining the nominal critical temperature gradients on the surface and at an investigation of the ignition characteristics in these limiting cases.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Dokl. Phys. Chem.|
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