A lean premixed-prevaporization (LPP) combustor for an automotive gas turbine has been developed to meet the Japanese emission standards for passenger cars without an aftertreatment system. The technical challenges on the LPP combustor have resulted in improving atomization and evaporation of fuel spray, avoiding flashback and stabilizing lean flame, and reducing exhaust emissions. The diagnoses and analyses on the characteristics of atomization, evaporation of fuel spray, flame stability and exhaust emissions mechanisms are very important to overcome the research subjects on LPP combustion. In this article, the research results were summarized on the history of automotive gas turbines and the research subjects of the LPP combustor in chapter 1, on the characteristics of atomization and spray in chapter 2, on the characteristics of spray evaporation in chapter 3, on the characteristics of LPP combustion in chapter 4, on the numerical analyses of LPP combustion in chapter 5, and on the future prospects for automotive gas turbine combustors in chapter 6.
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