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Ignition delay times have been measured behind reflected shock waves in ethane-oxygen-argon mixtures at temperatures between 1150 and 1500 K and pre-ignition pressures between 10 and 14 atm.  Delay times have been measured both by pressure rise and OH absorption at 307 nm.  Kinetic modelling of the ignition delays has been made using the GRIMech 3.0 mechanism which with addition of several reactions involving HO 2  radicals and an increase in the barrier for reaction between C 2 H 5  and O 2  can satisfactorily model delays over the studied equivalence ratios of φ = 1.7 to 0.68.  Addition of 2H-heptafluoropropane up to 13 mol % (of ethane) had little inhibition effect on stoichiometric ethane-oxygen-argon mixtures but inhibited ignition in a mixture of φ = 1.5.  A kinetic mechanism is presented to model the inhibition process.

An Experimental and Modelling Study of Ignition Delays in Shock-Heated Ethane-Oxygen-Argon Mixtures Inhibited by 2H-Heptafluoropropane