急速圧縮膨張装置を用いた直接噴射式ディーゼル機関の壁面熱損失に関する研究 : 第1報,雰囲気の酸素体積分率と密度が熱損失に及ぼす影響(熱工学,内燃機関,動力など)

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In order to clarify the mechanism of heat loss in DI diesel engines, total amount of heat loss and local heat flux at various locations on the piston head were measured by using a rapid compression and expansion machine. High-speed direct photography of spray flame was carried out and flame temperature distribution was obtained by two-color method. In order to investigate the effects of combustion characteristics, such as flame temperature, on heat loss, oxygen volume fraction was varied as experimental parameter in two different ways. In the first way, the oxygen volume fraction was varied from 21% to 15% at a constant intake gas pressure (0.1MPa). In the second way, the oxygen volume fraction was varied from 21% to 15% by adding nitrogen at a constant amount of oxygen in the cylinder. Measurement results in the first case showed that the flame temperature decreased and the heat loss slightly decreased with decrease in oxygen volume fraction. However, the ratio of the heat loss to the gross heat release was almost constant regardless of the oxygen volume fraction. On the other hand, in the second case, the heat loss and the ratio of the heat loss to the gross heat release decreased with decrease in oxygen volume fraction. This decrease of the heat loss is due to the lower flame temperature and the reduced area and period of direct contact between the flame and the chamber wall, caused by the higher heat capacity and density of the ambient gas.
社団法人日本機械学会の論文
2006-09-25

急速圧縮膨張装置を用いた直接噴射式ディーゼル機関の壁面熱損失に関する研究 : 第1報,雰囲気の酸素体積分率と密度が熱損失に及ぼす影響(熱工学,内燃機関,動力など)

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