Cool flame

Cool flame

Chemistry of Biodiesel Fuels based on Soybean Oil

Published in Ozcan Konur, Biodiesel Fuels Based on Edible and Nonedible Feedstocks, Wastes, and Algae, 2021

The ability of a fuel to provide a cool flame increases its overall reactivity in engine combustion applications. In such conditions, a fuel/air mix is steadily heated until the cool flame ignites, and most typical fuels will see approximately the same pressure/temperature/time history. After the cool flame period ends, fuels will experience another partial ignition when the temperature reaches about 900–1,000 K when O-O bonds in H2O2 and other species, including ketohydroperoxides, are broken. These degenerate chain branching steps provide a pulse of heat due to the oxidation of the large amounts of OH that are produced, so the mixture will then proceed rapidly to the final high temperature step in the ignition process.

Study of Cool Flames of Octane Isomers in the Counterflow Burner

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Journal Information

Published in Combustion Science and Technology, 2022

Shenghua Yang, Rui Zhang, Xun Zhou, Dong Liu

The mechanisms above behavior well on predicting hot flame of octane. However, the process of cool flame is usually controlled by low-temperature chemistry. Meanwhile, the extinction limits of diffusion flames are more sensitive to gas-phase dynamics, surface dynamics, and transport than temperature profiles (Niemann, Seshadri, Williams 2013). Therefore, three iso-octane and two n-octane mechanisms with two ozone sub-mechanisms are validated by extinction limits, respectively.

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Chemistry of Biodiesel Fuels based on Soybean Oil

Study of Cool Flames of Octane Isomers in the Counterflow Burner