Gas turbine combustor technology has developed gradually and continuously over the last 50 years. The close resemblance between various gas turbine combustors evolves from the basic need that is dictated largely by the length and frontal area to remain within the limits set by other engine components and incorporation of a diffuser (to minimize pressure loss) and liner (to provide stable operation over a wide range of air/fuel ratios). Despite the continued advances in gas turbine combustor technology, the challenge which a combustion engineer faces today to ingenuity in design is greater than ever before. Interest in the environment by scientists and the general public has evolved from the gradual deterioration in our air quality and the discovery of the Antarctic ozone hole, in addition to hot summers, greenhouse effect and increased smog in the cities. In addition, the energy conservation and higher conversion efficiencies remain on the priority list.