壁面に沿う拡散火炎から壁面へのすす付着に及ぼす壁面温度の影響(熱工学,内燃機関,動力など)

概要

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The effect of wall temperature on soot deposition from a diffusion flame placed near the wall has been investigated by utilizing microgravity environment, which can attain very stable flame along the wall. Cylindrical burner with fuel injection was adopted to obtain two dimensional soot distributions by laser extinction method. In the experiment three different wall temperatures, T_w=300, 600, 800K, were selected as test conditions. The results showed that the soot distribution between flame and burner wall was strongly affected by the wall temperature and soot deposition increases with decrease in wall temperature. According to the numerical calculation both convective motion and thermophoretic effect are important to explain the transfer of soot toward the burner wall. Then, "soot deposition length" defined as the relevant approach distance to the wall per a given axial distance is newly introduced as a better parameter to evaluate the soot deposition tendency to the wall. The comparison among the values for three different wall temperatures suggested that the change in thermophoretic effect is the most dominant factor to give the change in soot deposition characteristics.
一般社団法人日本機械学会の論文
2005-03-25