B-7 プロパン燃料超小型ガスタービン用燃焼器の振動燃焼に関わる諸特性(燃焼器,一般講演)

概要

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An annular-type propane-fueled combustor for a several hundreds W-class micro gas turbine was developed. A lean-premixed combustion method was applied to realize low NOx emission, and the volume of combustion chamber is 60cm3 with a space heating ratio of 800MW/(m3・MPa). To evaluate combustion characteristics of the micro combustor at elevated pressure, the combustor exit area was decreased by introducing a turbine stator nozzle, resulting in the occurrence of the oscillatory combustion. The cause was that the Helmholtz oscillation with a low frequency of around 1OOHz or less occurred due to the pressure interference between the fuel injector and the combustion chamber. The inner exit diameter of the injector was decreased to increase the fuel supply pressure, which suppressed the Helmholtz oscillation and improved the flame stability.
2011-07-06