Numerical Simulation of Laminar Burning Velocity of Isopropyl Nitrate/Methanol/Air Mixtures
To investigate the effect of isopropyl nitrate(IPN)on the reactivity of laminar premixed flames of methanol/air mixtures,the laminar burning velocity of IPN/methanol/air mixtures was simulated by using Cantera open-source dynamics software,and the concentration distribution of the main intermediates and the sensitive reactions were analyzed.The results showed that the addition of IPN contributed to the increase in the amount of reactive radicals such as H,O,OH,etc,the increase in flame temperature,the decrease in the inert component of HO2 and the acceleration of laminar burning velocity of the methanol/air mixture in the lean combustion zone.When the proportion of IPN blending exceeded 10％,the promotion of methanol laminar burning velocity gradually weakened,and the inhibitory effect appeared in the rich combustion zone.In pure methanol/air mixtures,the HCO-based third-body monomolecular cleavage reaction(R103:HCO+M=CO+H+M)was the most sensitive to the laminar burning velocity.With IPN addition,CO+OH=CO2+H became more important in the depleted combustion zone,and the depletion reactions of H radicals(R9:H+HO2=H2+O2)and O radicals(R10:HO2+O=O2+OH)had a weakened inhibitory effect on the reactivity.CH3O radicals are the key intermediate components in the pathway connecting methanol and IPN depletion reactions.
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