Abstract
Laminar burning velocities of isooctane, ethanol, and isooctane-ethanol blends in air have been determined over a practical range of mixture strength at various initial mixture temperatures using a constant volume spherical bomb. Measurements were made during the constant pressure combustion period and a detailed density correction scheme was employed for calculation of burning velocities from the measured flame growth rates. A strong promotion of isooctane combustion by ethanol has been observed. Maximum burning rates were found to occur at an equivalence ratio of approximately 1.08, independently of unburned mixture temperature and fuel type. Mixture strength, unburned mixture temperature, and fuel type dependence of burning velocity is represented by empirical functions over the range of Φ = 0.75−1.4, T u = 350−600K, and up to 20% ethanol (by liquid volume) in isooctane-ethanol blends.
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