TY - JOUR
T1 - Autoignition and flame propagation in non-premixed MILD combustion
AU - Doan, Nguyen Anh Khoa
AU - Swaminathan, Nedunchezhian
PY - 2019/3
Y1 - 2019/3
N2 - Direct Numerical Simulation (DNS) data of Moderate or Intense Low-oxygen Dilution (MILD) combustion are analysed to gather insights on autoignition and flame propagation in MILD combustion. Unlike in conventional combustion, the chemical reactions occur over a large portion of the computational domain. The presence of ignition and flame propagation and their coexistence are studied through spatial and statistical analyses of the convective, diffusive and chemical effects in the species transport equations. Autoignition is observed in regions with lean mixtures because of their low ignition delay times and these events propagate into richer mixtures either as a flame or ignition. This is found to be highly dependent on the mixture fraction length scale, ℓZ, and autoignition is favoured when ℓZ is small.
AB - Direct Numerical Simulation (DNS) data of Moderate or Intense Low-oxygen Dilution (MILD) combustion are analysed to gather insights on autoignition and flame propagation in MILD combustion. Unlike in conventional combustion, the chemical reactions occur over a large portion of the computational domain. The presence of ignition and flame propagation and their coexistence are studied through spatial and statistical analyses of the convective, diffusive and chemical effects in the species transport equations. Autoignition is observed in regions with lean mixtures because of their low ignition delay times and these events propagate into richer mixtures either as a flame or ignition. This is found to be highly dependent on the mixture fraction length scale, ℓZ, and autoignition is favoured when ℓZ is small.
KW - DNS
KW - Flameless combustion
KW - Flux analysis
KW - Ignition
KW - MILD combustion
UR - http://www.scopus.com/inward/record.url?scp=85059770073&partnerID=8YFLogxK
U2 - 10.1016/j.combustflame.2018.12.025
DO - 10.1016/j.combustflame.2018.12.025
M3 - Article
AN - SCOPUS:85059770073
SN - 0010-2180
VL - 201
SP - 234
EP - 243
JO - Combustion and Flame
JF - Combustion and Flame
ER -