Shock-Tube Measurements of the Ignition Delay Times of Reference Fuels at Intermediate Temperatures and High Pressures
Ignition times were determined in high-pressure shock-tube experiments for various stoichiometric mixtures of two multi-component model fuels in air for the validation of ignition delay simulations based on chemical kinetic models. The fuels were n-heptane (18%) / iso-octane (62%) / ethanol (20%) as well as n-heptane (20%) / toluene (45%) / iso-octane (25%) / di-isobutylene (10%), by liquid volume. These fuels have octane numbers comparable to a standard European gasoline of 95 RON and 85 MON. The experimental conditions cover temperatures from 690 to 1200 K and pressures at 10, 30, and 50 bar. The obtained ignition time data are scaled and compared to previous results reported in literature. This study confirms that the autoignition of pure fuels differ from those of mixtures due to the coupling of the chemical kinetics of the various components.
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