出力数百W級超小型ガスタービン用アニュラー型プロパン燃焼器の燃焼特性

概要

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An annular-type propane-fueled micro combustor has been developed for a several hundred W-class micro gas turbine. For a lean-premixed combustion, an orifice was located in the chamber to promote the fuel/air mixing and the flame stability. A prototype combustor was manufactured to examine the combustion characteristics of the primary combustion zone. By changing the orifice ratio into 0, 0.28 and 0.53, the flame shape changed to tubular flame and orifice-downstream flame. Based on the prototype combustor, an engineering-model combustor, which had the combustion chamber volume of 50cm^3, was developed. The flame stability limit showed enough wide operation regions including design point. The CO concentrations were between 300 and 820ppm at the equivalence ratios over 0.35. The NOx emission was around 20ppm (@16%O_2) at the design point. The combustor attained a high combustion efficiency of 99.4% under a high space heating rate of 800MW/(m^3・MPa).
2010-11-20