ガスタービン用燃焼器の流動抵抗について

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タイトル別名
  • On the Fluid Resistance of Gas Turbine Combustor
  • ガス タービン ヨウ ネンショウキ ノ リュウドウ テイコウ ニ ツイテ

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説明

As the existing formula for the total pressure drop ΔP in the gas turbine combustor, [numerical formula] includes the total pressure drop ΔPM due to the momentum change of the gas flow, the physical meaning of the resistance coefficient C2 becomes doubtful. Therefore, the authers tried to devide ΔP into the net pressure drop δP due to the pure resistance and the pressure drop ΔPM due to the momentum change in the air flow accompanying combustion as follows : [numerical formula] and [numerical formula] where P=the total press., p=static press., γ=the specific weight of the air or the gas, ν=the mean velocity of flow, T=the temp. of the air or the gas, and suffix 1=the inlet, 2=the outlet, m=the adequate mean position, assuming that the combustor provides pipes of equal cross sectional areas both at the inlet and the outlet. The values of resistance coefficients Cγ1, Cγ2 and Cγm are determined experimentally with various types of heated coils, throttle plates and mixing plate, using the electric heater instead of the combustion of fuels to get higher accuracy in the measurement. From these experiments, it can be concluded that the total pressure drop ΔP of the heated gas can be estimated from the resistance coefficient Cγ0 of the cold state with [numerical formula] if coefficients α, β are properly chosen, without measuring the troublesome mean total pressure drops at all points of the cross section of the outlet pipe. Or, the properties of resistances can be analyzed from the values of α and β, when the total pressure drop ΔP has been measured.

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