2021 Fiscal Year Final Research Report
Analysis and modeling of particulate matter formation using premixed flame
| Project/Area Number |
19H02080
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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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 | Kyushu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
渡邊 裕章 九州大学, 総合理工学研究院, 教授 (60371598)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 燃焼 / すす / 予混合火炎 / 火炎伸長 |
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| Outline of Final Research Achievements |
At cusp regions of unstable cellular rich iso-octane/air flame whose Lewis number is less than unity, flame temperature was found to be reduced due to the thermo-diffusive effects induced by the negative flame stretch rate. Increase in acetylene concentration due to the decreased flame temperature promoted the surface growth of soot particles which were formed due to the deficient oxygen. This promoted surface growth accelerated the surface growth of soot particles and increase in the soot volume further. Increase in the soot volume was found to be caused by the thermo-diffusive effects induced by the negative flame stretch rate.
The influence of the thermo-diffusive effects induced by the negative flame stretch rate on the soot formation was larger for the richer flame with smaller Lewis number.
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| Free Research Field |
反応性ガス力学
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| Academic Significance and Societal Importance of the Research Achievements |
噴霧燃焼などの濃淡な燃料濃度を有する複雑な燃焼場から排出される粒子状物質(Particulate Matter, PM)であるすすの生成過程を，均質予混合気を用いてその燃料濃度を変化させながら調べ，非均質性とそれ以外の因子との分離に成功した．さらに，すす生成には火炎に作用する火炎伸長に起因する熱-拡散効果が大きな影響を及ぼすことを明らかにした．PMの燃焼機器からの排出低減に資する重要な知見を得た．
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