Recently, elucidation of the near-wall heat transfer is strongly required for enhancing engine thermal efficiency. However, the previous wall heat flux models assuming the wall-function do not have enough prediction accuracy as for the recent engine technical development. This study focused on the influence of tumble and unsteady effects as the error factor and investigated them on the near-wall heat transfer in recent high compression ratio and high tumble SI (spark ignition) engine. In this paper, the measurements of heat flux and flow distribution in an optical SI engine, three kinds of 1-D calculation and estimation related to heat flux with previous models were performed. Finally, it is shown that four mechanisms regarding tumble and unsteady effects cause the previous models underestimation.
|出版ステータス||Published - 2017|
|イベント||11th Asia-Pacific Conference on Combustion, ASPACC 2017 - Sydney, Australia|
継続期間: 2017 12月 10 → 2017 12月 14
|Other||11th Asia-Pacific Conference on Combustion, ASPACC 2017|
|Period||17/12/10 → 17/12/14|
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