Experimental Measurement and Calculated Flame Temperature (CFT) Modeling of Binary Hydrocarbon Mixture Flammability Limits

摘要

The flammability limits of binary hydrocarbon mixtures were measured in a cylindrical reaction vessel with flame visual identification criterion. By comparing experimental data with predictions through Le Chatelier’s Law, we found that the lower flammability limits of binary hydrocarbon mixtures can be fit by Le Chatelier’s Law very well; for upper pp flammability limits of fuel mixtures that contain two saturated hydrocarbons, the experimental observations can be roughly fit by Le Chatelier’s Law; however, for upper flammability limits of fuel mixtures containing one unsaturated component at least, modification of Le Chatelier’s Law is needed. Le Chatelier’s law was modified by powering the percentage concentrations of fuels. Because heat loss can affect experimental flammability limits, the lower flammability limits of binary hydrocarbon mixtures are also predicted using calculated flame temperature (CFT) modeling, which is based on the principle of energy hich is conservation. Specifically, the fuel mixture lower flammability limit is quantitatively correlated to its final flame temperature at non adiabatic conditions. The modeling predictions are compared with experimental observations, and the minor deviations between them indicated that CFT modeling can represent experimental measurements very well.