The effects of an impingement surface and quenching on the structure of laminar premixed flames

To further current knowledge of how strain effects the structure of impingi ng flames and how these effects play a role in the surface modification of polymer films. two premixed impinging flames are modeled using the SPIN app lication of the CHEMKIN software: in Case 1, a methane - air flame, and in Case 2, a methane - air flame with 4.5% nitrous oxide additive. In Case 1, the quenching activates six reactions that consume O, H, and OH, while H2O2 and HO2 are produced. In Case 2, the quenching and N2O additive further co nsume the oxidizing species, while HNO, N2O, NO, and NO2 are produced in si gnificant quantities through activation of six additional reactions. It is shown that the strain applied to the flame by impingement on the cool stagn ation surface leads to secondary reactions in the quench zone that are dire ctly responsible for the modification of the polymer film surface.