TY - JOUR
T1 - Flame front structure and burning velocity of turbulent premixed CH 4/H2/air flames
AU - Zhang, Meng
AU - Wang, Jinhua
AU - Xie, Yongliang
AU - Jin, Wu
AU - Wei, Zhilong
AU - Huang, Zuohua
AU - Kobayashi, Hideaki
N1 - Funding Information:
This study is partially supported by National Natural Science Foundation of China (No. 51006080 ) and the Fundamental Research Funds for the Central Universities. Jinhua Wang acknowledges the Japan Society for the Promotion of Science for a JSPS Postdoctoral Fellowship grant.
PY - 2013/8/30
Y1 - 2013/8/30
N2 - Flame front structure of turbulent premixed CH4/H 2/air flames at various hydrogen fractions was investigated with OH-PLIF technique. A nozzle-type burner was used to achieve the stabilized turbulent premixed flames. Hot-wire anemometer measurement and OH-PLIF observation were performed to measure the turbulent flow and detect the instantaneous flame front structure, respectively. The hydrogen fractions of 0%, 5%, 10% and 20% were studied. Results show that the flame front structures of the turbulent premixed flames are wrinkled flame front with small scale convex and concave structures compared to that of the laminar-flame front. The wrinkle intensity of flame front is promoted with the increase of turbulence intensity as well as hydrogen fraction. Hydrogen addition promotes the flame intrinsic instability which leads to the active response of laminar flame to turbulence and results in the much more wrinkled flame front structure. The value of S T/SL increases monotonically with the increase of u′/SL and hydrogen fraction. The increase of S T/SL with the increase of hydrogen fraction is mainly attributed to the diffusive-thermal instability effects represented by the effective Lewis number, Leeff. A general correlation between S T/SL and u′/SL is provided from the experimental data fitting in the form of ST/SL ∞ a(u′/SL)n, and the exponent, n, gives the constant value of 0.35 for all conditions and at various hydrogen fractions.
AB - Flame front structure of turbulent premixed CH4/H 2/air flames at various hydrogen fractions was investigated with OH-PLIF technique. A nozzle-type burner was used to achieve the stabilized turbulent premixed flames. Hot-wire anemometer measurement and OH-PLIF observation were performed to measure the turbulent flow and detect the instantaneous flame front structure, respectively. The hydrogen fractions of 0%, 5%, 10% and 20% were studied. Results show that the flame front structures of the turbulent premixed flames are wrinkled flame front with small scale convex and concave structures compared to that of the laminar-flame front. The wrinkle intensity of flame front is promoted with the increase of turbulence intensity as well as hydrogen fraction. Hydrogen addition promotes the flame intrinsic instability which leads to the active response of laminar flame to turbulence and results in the much more wrinkled flame front structure. The value of S T/SL increases monotonically with the increase of u′/SL and hydrogen fraction. The increase of S T/SL with the increase of hydrogen fraction is mainly attributed to the diffusive-thermal instability effects represented by the effective Lewis number, Leeff. A general correlation between S T/SL and u′/SL is provided from the experimental data fitting in the form of ST/SL ∞ a(u′/SL)n, and the exponent, n, gives the constant value of 0.35 for all conditions and at various hydrogen fractions.
KW - Flame front structure
KW - Hydrogen addition
KW - OH-PLIF
KW - Turbulent burning velocity
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U2 - 10.1016/j.ijhydene.2013.05.051
DO - 10.1016/j.ijhydene.2013.05.051
M3 - Article
AN - SCOPUS:84882454727
VL - 38
SP - 11421
EP - 11428
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 26
ER -
