Size effect on the flame base locations after V-gutters for premixed flames

It is well known that a flame base is very important to the existence of a flame. In this paper the movements of the flame bases after V-gutters in rectangular (2-D) passages are performed. The effects of different V-gutter sizes and different inlet velocities on the flame bases are studied and their movements are analyzed. The inlet mixture composed of kerosene and air are at lean equivalence ratio, room temperature and pressure. The results show that when the V-gutter size is small, there is only one flame base located after the recirculation zone, and its location moves downstream as the inlet velocity increases. When the V-gutter size is large, there are the two flame bases located immediately after the V-gutter’s trailing edge in both side of the shear layers. As the inlet velocity increases, the flame bases move upstream, while the recirculation zone extends downstream. When the V-gutter size is medium, there are also two flame bases located in the shear layer near the end point of the recirculation zone. And when the medium V-gutter size is used, the flame bases move to the same direction as the recirculation zone end point in streamwise direction as the inlet velocity increases.