Abstract
Cool flames and multistage ignitions can be regarded as dynamic phenomena of hydrocarbon combustion processes. Any kinetic mechanism must also meet dynamic requirements in order to model the combustion process. Studies of the dynamics of combustion processes were rediscovered only recently, mainly with the help of the CSTR technique. Knocking is regaining interest among combustion researchers and consequently there should be a new interest in the auto ignition of hydrocarbons. Predictive models of the evolution of the end-gas are particularly needed. Knowledge of its dynamic behaviour places more constraints on the modeler. Dynamic behaviours of combustion processes of n .heptane, i .octane and their mixtures (0–100 O.N.) have been studied in a CSTR. Experiments were performed at atmospheric pressure and fuel-rich conditions. Behaviors of systems were studied for different temperatures (510–790 K) and residence time (8–21 s). The n .heptane combustion process exhibits unstable states at low temperatures, whereas i .octane evolves through unstable states at higher temperatures. Mixtures having O.N. less than 97 exhibit unstable states. Heat release rates were experimentally evaluated and compared. The overall results indicate that instability, and hence knocking, is thermokinetic in nature, with kinetics playing the major role.
Published Version
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