2021 Fiscal Year Final Research Report
High response control of air entrainment into unsteady spray combustion with a small amount of additives
| Project/Area Number |
19K04208
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | Ozone / Spray combustion / Compression ignition / Air entrainment |
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| Outline of Final Research Achievements |
To control the ignition of unsteady fuel spray and the air-entrainment into its spray flame, ozone was introduced into the intake air in a compression ignition engine. A two-stage fuel injection with very early injection and late injection close to top dead center was adopted to utilize O-radicals decomposed from the ozone before the recombination reaction reduces them to oxygen molecules. The experimental results with variations of the first injection quantity and the ozone concentration demonstrated that the ignition delay of the fuel spray injected near top dead center and the amount of air entrained into its fuel spray flame can be controlled, and that engine operations achieving high thermal efficiency and low exhaust emissions simultaneously are possible with the proposed method.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
非定常噴霧の自着火燃焼を実現する熱機関において，有害排出物質の低減と高熱効率化の両立は重要な課題である．これを解決するため，本研究では，噴霧火炎内部への空気導入量を高応答に制御する手法を構築した．その手法は微量化学種を起点とする化学反応を燃料の早期噴射という物理的手段で制御する点で学術的に新規性があり，実機関にも展開可能な技術という点で産業応用が可能であり，社会的意義が高い．
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