The behavior of the flame propagation in premixed methane-air of a main chamber was analyzed by using the LES turbulent, 2-scaler flamelet combustion flow simulation The flame shape is long and slender immediately after it flows into the main chamber. As the turbulence at the flame front grows, the flame extends horizontally and the flame structure becomes more complex. The effect of the diameter of the sub-chamber orifice of 4mm and 7mm was investigated. For the case of 4mm, the inflow velocity is higher and the flame shape is longer and more slender. The predicted flame behavior agreed well with the visualized experiments, it was shown that the present model is very feasible.
