TY - JOUR
T1 - Measurements of laminar burning velocities and onset of cellular instabilities of methane-hydrogen-air flames at elevated pressures and temperatures
AU - Hu, Erjiang
AU - Huang, Zuohua
AU - He, Jiajia
AU - Zheng, Jianjun
AU - Miao, Haiyan
N1 - Funding Information:
This study is supported by the National Basic Research Program of China (grant no. 2007CB210006) and by the National Natural Science Foundation of China (grant nos. 50636040 and 50821604).
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/7/1
Y1 - 2009/7/1
N2 - An experimental study on laminar burning velocities and onset of cellular instabilities of the premixed methane-hydrogen-air flames was conducted in a constant volume combustion vessel at elevated pressures and temperatures. The unstretched laminar burning velocity and Markstein length were obtained over a wide range of hydrogen fractions. Besides, the effects of hydrogen addition, initial pressure and initial temperature on flame instabilities were analyzed. The results show that the unstretched flame propagation speed and the unstretched laminar burning velocity are increased with the increase of initial temperature and hydrogen fraction, and they are decreased with the increase of initial pressure. Early onset of cellular instability is presented and the critical radius and Markstein length are decreased with the increase of initial pressure, indicating the increase of hydrodynamic instability with the increase of initial pressure. Flame instability is insensitive to initial temperature compared to initial pressure. With the increase of hydrogen fraction, significant decrease in critical radius and Markstein length is presented, indicating the increase in both diffusional-thermal and hydrodynamic instabilities as hydrogen fraction is increased.
AB - An experimental study on laminar burning velocities and onset of cellular instabilities of the premixed methane-hydrogen-air flames was conducted in a constant volume combustion vessel at elevated pressures and temperatures. The unstretched laminar burning velocity and Markstein length were obtained over a wide range of hydrogen fractions. Besides, the effects of hydrogen addition, initial pressure and initial temperature on flame instabilities were analyzed. The results show that the unstretched flame propagation speed and the unstretched laminar burning velocity are increased with the increase of initial temperature and hydrogen fraction, and they are decreased with the increase of initial pressure. Early onset of cellular instability is presented and the critical radius and Markstein length are decreased with the increase of initial pressure, indicating the increase of hydrodynamic instability with the increase of initial pressure. Flame instability is insensitive to initial temperature compared to initial pressure. With the increase of hydrogen fraction, significant decrease in critical radius and Markstein length is presented, indicating the increase in both diffusional-thermal and hydrodynamic instabilities as hydrogen fraction is increased.
KW - Elevated pressures and temperatures
KW - Hydrogen
KW - Laminar burning velocity
KW - Methane
KW - Onset of cellular instability
UR - http://www.scopus.com/inward/record.url?scp=67649625782&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2009.04.058
DO - 10.1016/j.ijhydene.2009.04.058
M3 - Article
AN - SCOPUS:67649625782
VL - 34
SP - 5574
EP - 5584
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 13
ER -