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

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

Department of Mechanical Engineering

Research output: Contribution to conference › Paper › peer-review

2 Citations (Scopus)

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 language	English
Publication status	Published - 2017
Event	11th Asia-Pacific Conference on Combustion, ASPACC 2017 - Sydney, Australia Duration: 2017 Dec 10 → 2017 Dec 14

Other

Other	11th Asia-Pacific Conference on Combustion, ASPACC 2017
Country/Territory	Australia
City	Sydney
Period	17/12/10 → 17/12/14

ASJC Scopus subject areas

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

Cite this

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title = "Influence of tumble and unsteady effects on near-wall heat transfer in SI engine",

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.",

author = "Ryosuke Okutani and Takeshi Yokomori and Masayoshi Matsuda and Hidetsugu Yamamoto and Norimasa Iida and Daijiro Ishii and Yuji Mihara",

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T1 - Influence of tumble and unsteady effects on near-wall heat transfer in SI engine

AU - Okutani, Ryosuke

AU - Yokomori, Takeshi

AU - Matsuda, Masayoshi

AU - Yamamoto, Hidetsugu

AU - Iida, Norimasa

AU - Ishii, Daijiro

AU - Mihara, Yuji

N1 - Funding Information: This work was supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), “Innovative Combustion Technology” (Funding agency: JST). Publisher Copyright: © 2017 Combustion Institute. All rights reserved.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

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T2 - 11th Asia-Pacific Conference on Combustion, ASPACC 2017

Y2 - 10 December 2017 through 14 December 2017

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

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ASJC Scopus subject areas

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