Abstract
The ignition time delay between the leading shock front and the onset of OH emission from a two-phase detonations of decane-oxygen has been measured. A thin layer of decane was placed on the walls of a 2.22 cm id tube 3-m long which was filled with oxygen or nitrogen-oxygen mixtures to 1/2, 1, or 2 atm. Self-sustaining propagation velocities from 0.9 to 1.9 km/sec were obtained depending on the nitrogen dilution. The ignition delay varied from 250 μsec to 35 μsec — the higher the velocity, the lower the ignition delay, and the higher the initial pressure, the lower the ignition delay. An Arrhenius-type correlation fits the data well and yields a pseudo-activation energy of 4.32 kcal/g mole for 1 atm initial pressure and 5.65 kcal/g mole for 1/2 atm. No evidence of major perturbations due to secondary or transverse waves within the ignition zone was observed.
Published Version
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