Role of atomic hydrogen diffusion in hydrogen flame inhibition

A laminar flame propagating in a rich homogeneous hydrogen-air mixture with addition of propylene is numerically simulated. Small amounts of propylene are shown to reduce the concentrations of HO₂ and OH in the low-temperature zone of the flame front, which effectively reduces the laminar burning velocity. In the flame front, propylene is consumed completely with formation of CO, CO₂, CH₄, C₂H₂, H₂, and H₂O, whereas hydrogen undergoes little oxidation compared to propylene. __________ Translated from Fizika Goreniya i Vzryva, Vol. 42, No. 4, pp. 3–7, July–August, 2006.