Abstract
The present study is performed to examine experimentally the burning velocity characteristics of lean hydrogen-premixed micro-scale spherical laminar flames in the range of flame radius γ_f approximately from 1 to 5mm, and also macro-scale laminar flames with γ_f>7mm for comparison. The mixtures have nearly the same laminar burning velocity and different equivalence ratio φ(0.3〜1.2). The radius and the burning velocity of micro-scale flames are obtained by using sequential schlieren images. The results show that the burning velocities of micro-scale flames with φ=0.3, 0.5 and 1.2 have a tendency to decrease with increasing γ_f and approach that of macro-scale flames, but such a trend can not be seen for φ=0.7 and 0.9 micro-scale flames.
