前炎燃燒におけるフォルムアルデヒド生成のおくれ

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書誌事項

タイトル別名
  • 前炎燃焼におけるフォルムアルデヒド生成のおくれ
  • ゼン エン ネンショウ ニ オケル フォルムアルデヒド セイセイ ノ オクレ
  • Lag of Formaldehyde Formation in Preflame Combustion

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説明

The work described was initiated to obtain a better understanding on the kinetics of preflame slow combustion. A small quartz spectrometer, a hydrogen discharge tube as light source and a quartz reaction chamber of diameter 33mm, length 300mm were employed. The temperature susceptibility of lag, the time required for the appearance of formaldehyde absorption caused by premixed fuel-air mixture enclosed in reaction chamber at given preflame temperature, is measured under atmospheric pressure. Assuming the reciprocals of lag are proportional to reaction rates of radical formation in preflame combustion, apparent activation energies of these reactions are calculated. It was found that these activation energies of fuels differ greatly according to their chemical structures, and they are in the following order : Benzene > Ethyl alcohol > n-Heptane > Toluene > Methyl alcohol > i-Octane, Acetone > i-Propylether Concerning to engine experiences, when running conditions of engine become severe, the better the performance, the smaller the activation energy of fuel is. Thus, i-propylether improves its octane rating at higher mixture temperature. Tetraethyllead may be a feeder of active radicals into the oxidation mixtures under this experimental conditions, and could serve to cut down the lag of preflame reaction. The direct connection of formaldehyde formation rate under these experimental conditions to antiknocking property is not reasonable.

資料番号: SA2410128000

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