Abstract
Simultaneous measurements of CH and OH radicals by planar laser induced fluorescence and three-component velocity by particle image velocimetry are conducted in turbulent premixed flames with different Reynolds number and equivalence ratio. In turbulent flames, which is classified near the boundary between corrugated flamelets and thin reaction zones in the turbulent combustion diagram, the minimum curvature radius of the flame front coincides with Kolmogorov micro scale and independent of Reynolds number and equivalence ratio, whereas probability of flame element with small curvature radius decreases with the decrease of equivalence ratio. Strain rate tangential to the flame front is of the order of the inverse of Taylor time scale.
