Air entrainment and combustion process of high-pressure gas jet in gas direct injection engines

Tharshan Thiripuvanam, Hiroshi Tashima, Daisuke Tsuru

研究成果: 会議への寄与タイプ論文

抄録

Gas engines, or piston engines burning natural gas become more popular not only in automobiles, but also in the fields of power generation and marine propulsion thanks to their lower fuel cost, more environment-friendly nature than their diesel counter parts. Although both premixed and diffusive combustion modes are used in gas engines, a gas direct-injection engine so called GI engine seems to be a favorable choice for large ocean-going ships, since the premixed combustion has fatal knocking problems and severe methane slip in larger engine dimensions. As for the combustion chamber configuration, GI engines have so high compatibility with large marine diesels that their injection strategy tends to follow them. GI engines, however, are said to have no efficiency improvement and longer after-burning period when compared with conventional diesels. It is necessary to investigate air entrainment behavior of a high-pressure gas jet and to optimize the injection conditions of GI engines. In the study, jet properties such as penetration length, jet cone angle, jet profile, and ambient velocity field around the jet were investigated in detail using a pressured constant volume chamber. Dynamic PIV system was applied to get the velocity field and the other properties were determined through shadowgraph jet images simultaneously taken with the PIV. The estimated air entertainment mass clarified the difference clear between a diesel spray and a high-pressure gas jet in their air entrainment process. Availability of the momentum theory for a liquid spray was examined in order to characterize the gas jet developing behavior. Brief firing experiments were additionally done with a Rapid Compression-Expansion Machine separately equipped with an original gas jet injector and a conventional diesel injector. The measured combustion processes successfully backed up the estimation results of air entrainments and implied the way to improve the diffusive gas jet combustion.

元の言語英語
出版物ステータス出版済み - 1 1 2017
イベント9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017 - Okayama, 日本
継続期間: 7 25 20177 28 2017

その他

その他9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017
日本
Okayama
期間7/25/177/28/17

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Air entrainment
Direct injection
Engines
Gases
Gas engines
Ship propulsion
Engine pistons
Combustion chambers
Automobiles
Power generation
Cones
Natural gas
Momentum
Ships
Dynamical systems
Methane
Compaction
Availability

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering

これを引用

Thiripuvanam, T., Tashima, H., & Tsuru, D. (2017). Air entrainment and combustion process of high-pressure gas jet in gas direct injection engines. 論文発表場所 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017, Okayama, 日本.

Air entrainment and combustion process of high-pressure gas jet in gas direct injection engines. / Thiripuvanam, Tharshan; Tashima, Hiroshi; Tsuru, Daisuke.

2017. 論文発表場所 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017, Okayama, 日本.

研究成果: 会議への寄与タイプ論文

Thiripuvanam, T, Tashima, H & Tsuru, D 2017, 'Air entrainment and combustion process of high-pressure gas jet in gas direct injection engines', 論文発表場所 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017, Okayama, 日本, 7/25/17 - 7/28/17.
Thiripuvanam T, Tashima H, Tsuru D. Air entrainment and combustion process of high-pressure gas jet in gas direct injection engines. 2017. 論文発表場所 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017, Okayama, 日本.
Thiripuvanam, Tharshan ; Tashima, Hiroshi ; Tsuru, Daisuke. / Air entrainment and combustion process of high-pressure gas jet in gas direct injection engines. 論文発表場所 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017, Okayama, 日本.
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