Abstract
This study is performed to examine experimental the burning velocity characteristics of hydrocarbon-premixed micro-scale spherical laminar flames with the flame radius r_f<approximately 5 mm, and also macro-scale laminar flames with r_f>7 mm for comparison, where methane or propane is used as hydrocarbon. The mixtures have nearly the same laminar burning velocity and different equivalence ratio φ(φ=0.8〜1.0 for methane mixtures, φ=0.8〜1.2 for propane mixtures). The radius, stretch and the burning. velocity of micro-scale flames are obtained by using sequential schlieren images recorded under appropriate ignition conditions. The results show that the burning velocities of micro-scale flames have tendency to increase with increasing r_f or decreasing the Karlovitz number and approach that of macro-scale flames. However, dependence on φ shows to be the difference between methane and propane mixtures.
