Abstract
In order to examine the ignition process, direct numerical simulation was carried out on spontaneous ignition of fuel gas jets injected parallel to a steady hot air stream. Full kinetics was used in the calculation of chemical reaction. Hydrogen was chosen as the fuel gas because of its relatively simple chemical reaction mechanism. Calculated results revealed the follows. (1) The ignition point moves from the peripheral region in the upstream of a fuel jet to its top region with a decrease in spouting velocity of fuel jet, and an increase in air temperature. (2) The ignition takes place in fuel-lean region situated at the end of hot air side in the mixing layer, where turbulence is weak. (3) The assumption that Lewis number is unity is not suitable, because the effect of molecular diffusion is significant in the ignition of fuel gas jets.
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