自動車用100kW級セラミックガスタービン燃焼器の特性 : その1 : 予蒸発予混合燃焼と噴霧燃焼の火災観察と火災安定範囲の評価

概要

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A lean premixed-prevaporization combustor (LPP combustor) for a 100kW automotive ceramic gas turbine has been developed to meet Japanese 10-15 mode emission standards for gasoline engine passenger cars without using an aftertreatment system. For practical use of a LPP combustor, the flashback and the flame instability in the LPP combustion must be prevented. Flame stability in LPP combustor was evaluated in the inlet air temperature range from 873K to 1173K, the air pressure range from 0.1MPa to 0.25MPa, the air velocity range from 5m/s to 30m/s and the atomizing air range from 1.5g/s to 4g/s. The flashback into the prevaporization-premixing fuel-air preparation space occurs at an equivalence ratio of about 0.5 for kerosene. The flashback is affected by three dimensional distribution of the fuel concentration and the air velocity. The lean blowout limit for the LPP combustion exists at average gas temperature of about 1500K. The condition to obtain the LPP flame stability range between flashback limits and lean blowout limits extends into more lean condition as the inlet air temperature or the air pressure increases.
社団法人日本ガスタービン学会の論文
1996-06-10