予混合火炎の寸法効果に関する一実験

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  • An Experimental Study on the Scale Effects of Premixed Flame
  • ヨ コンゴウ カエン ノ スンポウ コウカ ニ カンスル イチ ジッケン

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The purpose of this paper is to find out the scale effects of the premixed flame of propane gas-air mixture, which is made in the mixing tubes with air holes arranged in a single row. The experimental results are as follows : The logarithm of the heat release increases linearly with decreasing the inverse Reynolds number ν1/DU1 (D : inner diameter of the mixing tube, U1 : mean velocity of the air flow in the mixing tube, ν1 : kinematic viscosity of the air in the mixing tube). The elongation of the straight lines indicates that the heat release attains to the lower calorific value at a certain Reynolds number. These Reynolds numbers and the slopes of the straight lines decrease monotonously with decreasing diameter of the mixing tube except for the range of about 20∼40 mm of the diameters of mixing tube. The Reynolds numbers decrease with the increase of the air-fuel ratio. The slopes are not affected by the air-fuel ratio except for the range of about 20∼40 mm of the diameters of mixing tube.

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