Experimental study on cellular flame propagation of blend fuels

An experimental study on cellular flame propagation of air and mixed fuel in a tube is presented. Methane and decane are used as light and heavy hydrocarbon, respectively. Propagation velocity, flame temperature, and cell size were measured. Cellular structure was observed for equivalence ratios below 0.85 as well as above 0.97, when nitrogen-diluted air (17% oxygen) was used as an oxidant. A phenomenological explanation is presented for the complex cellular flame propagation under consideration here, with attention being paid to the variation of the reduced Lewis number with fuel composition.