The scenario of fuel injected into hot surrounds is found in a range of practical combustion applications. These flame conditions have been emulated using a jet in hot coflow burner. Four lifted, turbulent flames, with a constant jet flow of a prevapourised n-heptane/N2 mixture at 380 K into various hot and vitiated coflow conditions, are investigated in this paper. Three of these flames issued into coflows generated by the combustion of different mixtures of ethylene/air and one had a coflow from a natural gas/air flame. Gas sampling and the nonlinear excitation regime two-line atomic fluorescence (NTLAF) technique were used to investigate the mixing between the hot coflow and the surrounding air, as well as the flame temperature for the different coflow configurations. A comparison of results for the turbulent n-heptane flames issuing into hot coflows is presented, suggesting that the hottest flame is not associated with the coflow containing the highest concentration of O2. The results also highlight the low temperature of the jet along centreline in comparison previous studies using simpler fuels.
|Original language||English (US)|
|Title of host publication||11th Asia-Pacific Conference on Combustion, ASPACC 2017|
|State||Published - Jan 1 2017|