燃料を添加した部分予混合雰囲気中の可燃性固体の燃え拡がり

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  • Flame Spread over Solid Fuel in Partially Premixed Atmospheres
  • ネンリョウ オ テンカ シタ ブブン ヨ コンゴウ フンイキ チュウ ノ カネンセイ コタイ ノ モエ ヒロガリ

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Studies on downward flame spread oversolid fuel are useful to understand complex two-phase non-premixed flames including fires. We investigate the flame spread in partially premixed atmospheres, which may occur under poorly ventilated conditions, forming the combustible mixtures of oxygen and fuel vapors. In this experiment, methane is added in the ambient air, which could be formed in the degradation process. The flame spread rate is measured with constant inflow velocity, and the temperature measurement of gas-phase is conducted. Two kinds of paper sheet are used as samples. Additionally, using a temperature-controlled furnace connected with gas chromatography, gaseous products are quantitatively analyzed to examine the degradation process. Results show that, CO and CO2 are major degradation products. A variety of hydrocarbon and small portion of hydrogen are also detected. In partially premixed atmospheres, the flame spread rate is increased, with the expanded high temperature region. This is because the fuel already exits in the upstream region to support the flame formation. Resultantly, the heat flow into preheat region is increased mainly due to heat conduction, resulting in the higher flame spread rate.

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