Thermodynamic Properties of Products of Combustion in Jet Engines and Gas Turbines, and a New Simple Method of Calculating Their Values

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  • ジェットエンジンおよびガスタービンの燃焼ガスの状態量に対する新計算法ならびに熱力学的特性
  • ジェットエンジンおよびガスタービンの燃焼ガスの状態量に対する新計算法ならひに熱力学的特性
  • ジェットエンジン オヨビ ガス タービン ノ ネンショウ ガス ノ ジョウタイリョウ ニ タイスル シン ケイサンホウ ナラビニ ネツリキガクテキ トクセイ

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The thermodynamic properties of products of combustion corresponding to various fuel compositions are discussed, and it is concluded that their values depend almost only upon carbon-hydrogen ratios, and if the carbon-hydrogen ratio is held fixed, other constituents can be neglected. Next, the relation between the thermodynamic properties of products of combustion and the excess air factor n is discussed. It is proved that variables of state, such as entropy s, enthalpy i, specific heat cp, cv, adiabatic constant κ, etc., of the products of combustion vary almost linearly with 1/n. Utilizing this fact, the thermodynamic performance values of jet engines and gas turbines can be computed with great convenience. Thus, we propose approximate expressions for the thermodynamic properties of products of combustion in a linear form, i' (T, n) =i' (T, ∞) +iΔ' (T) · (1/n), s' (T, p, n) =s' (T, p, ∞) +sΔ' (T) · (1/n), ……, where i' (T, ∞), iΔ' (T), s' (T, p, ∞), sΔ' (T), ……, are independent of n, and determined under the conditions that the errors of these approximate expressions are held minimum.

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