Promotion and Inhibition of Oxidation of Rich Hydrogen-Air Mixtures by Nitric Oxides (NO and NO2) during Adiabatic Self-Ignition

作者：Bunev V A^*

来源：Combustion, Explosion and Shock Waves, 2011, 47(1): 19-25.

DOI：10.1134/S0010508211010035

• nitric oxides
• inhibition
• promotion
• hydrogen oxidation
• tracer method
• numerical simulation

The tracer method was used to numerically study the effect of nitric oxides (NO and NO2) on the oxidation of rich hydrogen-air mixtures during adiabatic self-ignition at low and high initial temperatures and a pressure of 0.1 MPa. At low temperatures, the added NO interacts with HO2 to form NO2, and NO2 then interacts with H to form NO. When NO2 is added at the same temperatures, a two-stage mechanism takes place: NO formed by the reaction NO2 + H is not involved in the reaction until NO2 is almost completely consumed. In the temperature range 900-1200 K, NO2 inhibits self-ignition through participation in the reaction with H, leading to the replacement of part of the completely branched chain H -> (O, OH) -> 3H by the unbranched chain H -> OH -> H. At low initial temperatures, NO effectively promotes hydrogen oxidation due to replacement of the unbranched chain H -> HO2 -> H2O2 -> OH -> H by a chain with branching.

• 出版日期2011-1