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Abstract
A conical jet-stirred reactor was utilized to study the formation of nitric oxide under nearstoichiometric conditions, and at pressures varying from 0.25 to 1 atm. Measurements of temperature, mass-flow rate, equivalence ratio, nitric oxide and oxygen concentrations were made and compared with perfectly stirred reactor (PSR) predictions, based on kinetic rate data and mechanisms chosen to maximize predicted NO formation and to correctly predict reactor blowout conditions. Observed blowout flow rates were greater by a factor of 2 than that predicted using PSR assumptions and rate data and mechanisms due to Marteney and due to Seery and Bowman. Measured NO levels were higher by a factor of 3 to 10 than predicted by the PSR computer model. A one-parameter “two-environment” mixing model was unsuccessfully applied to the analytical model, in an attempt to correct for imperfect stirring. Since factors controlling formation of NO by the Zeldovich mechanism were suppressed (short residence time and low combustion temperature), the high levels of NO observed are postulated to be due to fast NO-producing reactions occurring during pyrolysis steps of the reaction mechanism.
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