and the result showed that
small amount of hydrogen addition would increase the
laminar flame speed and extend the extinction limit. Other
studies also reported the combustion characteristics of syngas
mixture, like laminar burning velocity and flame stability,
using the methods of constant-pressure spherical flames and
counter-flow flames [8e10]. Bunsen flame configuration and
flame cone angle was also widely used to measure the flame
speed of syngas/air mixtures.