Laminar flame speeds of iso-octane/n-butanol blends-air mixtures at elevated temperatures

In this work, laminar flame speed of iso-octane/n-butanol-air mixtures was studied using the outwardly expanding spherical flame method and high-speed schlieren photography technique over a wide range of equivalence ratios and blending ratios at elevated initial temperatures. To interpret the dependence of the laminar flame speed on volume fraction of n-butanol in fuel blends (f _vb), mechanistic interpretation was attempted through examining thermodynamic property, diffusive property and oxidation kinetics of the mixtures. Furthermore, the measured laminar flame speeds were fitted as a function of equivalence ratio, initial temperature and n-butanol fraction so as to provide some engineering merits.