Effect of hydrogen addition on the counterflow ignition of n-butanol at atmospheric and elevated pressures

摘要: Abstract The present experimental and computational study describes the non-premixed counterflow ignition of nitrogen-diluted pre-vaporized n-butanol/hydrogen mixtures impinging on a heated air stream for pressures 1–4 atm hydrogen molar percentages in binary fuel blends ranging from ξH = 0% (pure n-butanol) to ξH = 100% hydrogen). data show that addition results non-linear decrease temperatures can be broken into two regimes; hydrogen-enhanced regime ξH = 0–40%, where more significantly decreases temperature, hydrogen-dominated range ξH = 40–100%, exhibit minimal sensitivity further addition. are then simulated using n-butanol-specific skeletal mechanisms developed comprehensive butanol models available literature. ability these predict variation associated with n-butanol “base” is assessed. Comparison between reveals both chemical kinetic capture two-regime behavior observed experiments, though over-predict temperatures. Further analysis controlled by production hydroperoxyl radicals, via reaction formyl radicals oxygen molecules dominating at low levels, three-body H + O2+M = HO2 + M high levels.