TY - JOUR
T1 - Correlation of turbulent burning velocity for syngas/air mixtures at high pressure up to 1.0MPa
AU - Wang, Jinhua
AU - Zhang, Meng
AU - Xie, Yongliang
AU - Huang, Zuohua
AU - Kudo, Taku
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 . Authors express their thanks to Prof. Yasuhiro Ogami, Dr. Masaki Okuyama and Mr. Futoshi Matsuno at Tohoku University for their helpful and valuable discussion. Jinhua Wang acknowledges the Japan Society for the Promotion of Science for a JSPS postdoctoral Fellowship grant.
PY - 2013/10
Y1 - 2013/10
N2 - Instantaneous flame front structures of the turbulent premixed flames of syngas/air and CH4/air mixtures were investigated using OH-PLIF technique at high pressure up to 1.0MPa, through which the turbulent burning velocities were derived and correlated with the turbulence intensity. Results show that both syngas/air and CH4/air mixtures, ST/SL increases remarkably with the increase of u'/SL particularly in the weak turbulence region. For the syngas/air mixture, the intensity of flame front wrinkle is promoted with the increase of hydrogen fraction in the syngas due to the increased preferential diffusive-thermal instability. Compared to CH4/air mixture, the syngas flames possess much wrinkled flame front with much smaller fine cusps structure, and with increasing u'/SL, the rate of the increase of ST/SL for the syngas/air mixtures is more significant than that of CH4/air mixtures. This demonstrates that the increase of flame front area due to turbulence wrinkling is promoted by flame intrinsic instability for syngas/air mixtures. The values of ST/SL for all mixtures increase with the increase of pressure because of the decrease of flame thickness which promotes the hydrodynamic instability. A general correlation of turbulent burning velocity for the syngas/air and CH4/air mixtures was obtained in the form of ST/SL∝a[(P/P0)(u'/SL)]n.
AB - Instantaneous flame front structures of the turbulent premixed flames of syngas/air and CH4/air mixtures were investigated using OH-PLIF technique at high pressure up to 1.0MPa, through which the turbulent burning velocities were derived and correlated with the turbulence intensity. Results show that both syngas/air and CH4/air mixtures, ST/SL increases remarkably with the increase of u'/SL particularly in the weak turbulence region. For the syngas/air mixture, the intensity of flame front wrinkle is promoted with the increase of hydrogen fraction in the syngas due to the increased preferential diffusive-thermal instability. Compared to CH4/air mixture, the syngas flames possess much wrinkled flame front with much smaller fine cusps structure, and with increasing u'/SL, the rate of the increase of ST/SL for the syngas/air mixtures is more significant than that of CH4/air mixtures. This demonstrates that the increase of flame front area due to turbulence wrinkling is promoted by flame intrinsic instability for syngas/air mixtures. The values of ST/SL for all mixtures increase with the increase of pressure because of the decrease of flame thickness which promotes the hydrodynamic instability. A general correlation of turbulent burning velocity for the syngas/air and CH4/air mixtures was obtained in the form of ST/SL∝a[(P/P0)(u'/SL)]n.
KW - High pressure
KW - OH-PLIF
KW - Syngas
KW - Turbulent burning velocity
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U2 - 10.1016/j.expthermflusci.2013.05.008
DO - 10.1016/j.expthermflusci.2013.05.008
M3 - Article
AN - SCOPUS:84880756954
SN - 0894-1777
VL - 50
SP - 90
EP - 96
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
ER -