This paper describes an experimental investigation carried out on a cyclone combustor and discusses their potential applications in a variety areas, including low calorific value gases and low grade fuels. Liquid fuel of 42 MJ/kg calorific value and chemical composition of 86.3 % C, 12.8 % H, 0.9 % S is used. The effect of equivalence ratio on the flame structure is studied involving the measurements of temperature, and species concentration. The study shows that the swirling action of the flow causes droplets to be retained within the main chamber of the cyclone until they are consumed. Highly complex turbulent flow patterns and long residence times within a region of intense reacting flow patterns developed within the chamber. This phenomena rise to a highly stable flame with wide blow-off limits whose characteristics varied in response to gave a change in equivalence ratio. The flow pattern obtained with the liquid fuel shows similar features to the gas- fired cyclone. There are several differences which can be attributed to the change in fuel and the characteristics of the atomizer and liquid fuel.