Abstract: In this short paper, flame and acoustic wave interactions under
laboratory conditions have been reported. The test rig consists of a
cylindrical Perspex tube and a fuel tube (burner) positioned along the central
axis of the tube. The acoustic characteristics of the rig are measured. The
flame instability with and without acoustic excitation has been investigated. A
high shutter speed colour camera has been applied to capture many interesting
unstable flame patterns. It has been found that strong flame instability only
occurs at particular frequencies. The position of the burner inside the
cylindrical tube also has an effect on flame instability.
Keywords: flame instability, diffusion flame, flame and acoustic wave interaction