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2報,噴霧流動およびスワール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 to the combustion chamber 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 was obtained by two-color method. In order to investigate the effects of the flow induced by the spray and its impingement on the chamber wall on heat loss, swirl ratio was varied from 0 to 5 and two different fuel injection nozzles (φ0.15mm×4 and φ0.10mm×10) were used. The measured local heat flux exhibited more uniform distribution with the φ0.10mm×10 nozzle than with the φ0.15mm×4 nozzle, and at higher swirl ratio. The heat loss amount during the single cycle increased with the increase in swirl ratio due to the increased heat loss after the combustion period. The heat loss amount during the combustion period was almost constant regardless of the swirl ratio. The heat loss amount during the single cycle and the combustion period were not very different between the two different nozzle cases. The magnitude of heat flux at flame impinging point did not significantly vary with the nozzle orifice diameter. This is because the effect of the reduced impinging velocity is cancelled out by the effect of the increased flame temperature in the case of smaller orifice diameter on the heat flux.
社団法人日本機械学会の論文
2006-11-25

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2報,噴霧流動およびスワール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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