Influence of tumble and unsteady effects on near-wall heat transfer in SI engine

Ryosuke Okutani, Takeshi Yokomori, Masayoshi Matsuda, Hidetsugu Yamamoto, Norimasa Iida, Daijiro Ishii, Yuji Mihara

Research output: Contribution to conferencePaper

Abstract

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.

Original languageEnglish
Publication statusPublished - 2017 Jan 1
Event11th Asia-Pacific Conference on Combustion, ASPACC 2017 - Sydney, Australia
Duration: 2017 Dec 102017 Dec 14

Other

Other11th Asia-Pacific Conference on Combustion, ASPACC 2017
CountryAustralia
CitySydney
Period17/12/1017/12/14

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Chemical Engineering(all)

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  • Cite this

    Okutani, R., Yokomori, T., Matsuda, M., Yamamoto, H., Iida, N., Ishii, D., & Mihara, Y. (2017). Influence of tumble and unsteady effects on near-wall heat transfer in SI engine. Paper presented at 11th Asia-Pacific Conference on Combustion, ASPACC 2017, Sydney, Australia.