Add time:08/19/2019         Source:sciencedirect.com

Ignition delay times in ethylene oxide Download full-size image, propylene oxide Download full-size image, 1,2-epoxybutane Download full-size image, and 2,3-epoxybutane Download full-size image, in mixtures containing oxygen and a diluent (argon or nitrogen) were measured behind reflected shock waves in a single-pulse shock tube over a wide range of composition, pressure, and temperature. Parametric relation corresponding to the equation τ=10uexp⁡(E/RT)[Fuel]β1[O2]β2[M]β3 were deduced for the four fuel molecules. In distinction from hydrocarbon ignition where βfuel is always found to be positive, βfuel in the ignition of the epoxy family of molecules is negative, close to unity, indicating a strong enhancing effect of the fuel. The reason for this enhancement is twofold. Upon subjection to shock heating, the unstable three-membered rings open and undergo exothermic isomerizations to more stable molecules such as ketones, aldehydes, alcohols, and ethers. These isomerizations, which take place during the induction period, release a considerable amount of heat and raise the temperature of the system. The second and more important reason is the high rate of initiation caused by the decomposition of the isomers, which are formed thermally excited with sufficient energy to dissociate into free radicals. The diluent, which is present in large excess, shows a positive power dependence (inhibiting effect) due to its quenching of the thermally excited species and preventing dissociation and due to adsorption of a large amount of heat generated during the induction period.

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