Different criteria for establishing ignition within reactive methane-air mixtures are discussed. It is shown that for relatively low initial mixture temperature using the different ignition criteria tends to produce very small relative differences in the values of the ignition delay. These differences can become very significant at relatively high initial mixture temperatures. Criteria for ignition based on sudden changes in pressure and temperature are recommended for reliably establishing the onset of autoignition, both in modeling and experimental studies.
An Analytical Examination of Various Criteria for Defining Autoignition Within Heated Methane-Air Homogeneous Mixtures
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Zhou, G., and Karim, G. A. (September 1, 1994). "An Analytical Examination of Various Criteria for Defining Autoignition Within Heated Methane-Air Homogeneous Mixtures." ASME. J. Energy Resour. Technol. September 1994; 116(3): 175–180. https://doi.org/10.1115/1.2906440
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