TY - JOUR
T1 - Measurement on instantaneous flame front structure of turbulent premixed CH4/H2/air flames
AU - Zhang, Meng
AU - Wang, Jinhua
AU - Xie, Yongliang
AU - Wei, Zhilong
AU - Jin, Wu
AU - Huang, Zuohua
AU - Kobayashi, Hideaki
N1 - Funding Information:
This study is supported by National Natural Science Foundation of China (Nos. 51006080 , 51376004 ) 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 - 2014/1
Y1 - 2014/1
N2 - Instantaneous flame front structure of turbulent premixed CH4/H2/air flames (hydrogen fraction of 0%, 5%, 10% and 20% by mole fraction) was investigated quantitatively using a nozzle-type Bunsen burner. Hot wire anemometer and OH-PLIF were used to measure the turbulent flow and detect the instantaneous flame front structure, respectively. Turbulent burning velocity, ST, flame surface density, σ, and mean flame volume, Vf, were calculated by processing the OH-PLIF images. Results show that the flame front structures of the turbulent premixed flames are the wrinkled flame front and it becomes much finer with the increase of turbulence intensity as well as hydrogen fraction. The value of ST/SL significantly increases with the increase of u'/SL and it slightly increases with the increase of hydrogen fraction. Flame surface density profile are symmetric and gives its maximum value at about c=0.5. Hydrogen addition slightly enhances the σ and the tendency is more obvious under higher turbulence intensity. The decrease of σ with the increase of turbulence intensity is mainly due to the effect of flame volume. The mean flame volume of flame region obviously increases with the increase of turbulence intensity within the experimental range due to the increase in depth of the large scale flame wrinkles and flame height. Hydrogen addition is not a predominant factor within the hydrogen fraction range in this study.
AB - Instantaneous flame front structure of turbulent premixed CH4/H2/air flames (hydrogen fraction of 0%, 5%, 10% and 20% by mole fraction) was investigated quantitatively using a nozzle-type Bunsen burner. Hot wire anemometer and OH-PLIF were used to measure the turbulent flow and detect the instantaneous flame front structure, respectively. Turbulent burning velocity, ST, flame surface density, σ, and mean flame volume, Vf, were calculated by processing the OH-PLIF images. Results show that the flame front structures of the turbulent premixed flames are the wrinkled flame front and it becomes much finer with the increase of turbulence intensity as well as hydrogen fraction. The value of ST/SL significantly increases with the increase of u'/SL and it slightly increases with the increase of hydrogen fraction. Flame surface density profile are symmetric and gives its maximum value at about c=0.5. Hydrogen addition slightly enhances the σ and the tendency is more obvious under higher turbulence intensity. The decrease of σ with the increase of turbulence intensity is mainly due to the effect of flame volume. The mean flame volume of flame region obviously increases with the increase of turbulence intensity within the experimental range due to the increase in depth of the large scale flame wrinkles and flame height. Hydrogen addition is not a predominant factor within the hydrogen fraction range in this study.
KW - Flame front structure
KW - Flame surface density
KW - Hydrogen addition
KW - OH-PLIF
KW - Turbulent burning velocity
UR - http://www.scopus.com/inward/record.url?scp=84888197943&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84888197943&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2013.10.002
DO - 10.1016/j.expthermflusci.2013.10.002
M3 - Article
AN - SCOPUS:84888197943
VL - 52
SP - 288
EP - 296
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
ER -