2022 Fiscal Year Final Research Report
Investigations on flame structures of turbulent lean premixed flames at elevated pressure by using combined laser diagnostics and combustion control using plasma actuators
| Project/Area Number |
18KK0400
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| Research Category |
Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))
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| Allocation Type | Multi-year Fund |
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| Research Field |
Thermal engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2019 – 2022
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| Keywords | 乱流燃焼 / 燃焼振動 / レーザ計測 / 燃焼制御 / 誘電体バリア放電プラズマアクチュエータ / 能動制御 |
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| Outline of Final Research Achievements |
The objectives of this research project are to clarify the combustion instability and combustion oscillation characteristics of lean turbulent premixed flames under high-intensity turbulence and elevated pressure conditions from the viewpoint of flame structure. The research was conducted by using the combined laser diagnostics of planar laser induced fluorescence (PLIF) and particle image velocimetry. From the measurement results under various conditions, the characteristic flame structures during a combustion oscillation transition and the factors of the variation characteristics of flame base structure were clarified. Furthermore, an active control method using a dielectric barrier discharge plasma actuator was developed for combustion oscillation control, and its control characteristics were clarified. In addition, a temperature measurement method based on PLIF was developed for further clarification of flame structure and combustion characteristics.
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| Free Research Field |
熱流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で明らかにされた燃焼振動遷移時の特徴的な火炎構造や火炎基部構造の変動特性の要因は，燃焼振動現象を明らかにし，普遍的な燃焼制御手法の構築につながる知見である．さらに，構築されたPLIFに基づく温度計測手法とこれまでの化学種と流体速度の計測を併せて用いた研究を行うことで，実験データからも燃焼モデリングや数値計算の有用な検証データとなる．これらは燃焼器内の現象の理解を促進するとともに燃焼器開発で用いられる数値計算の高精度化につながり，デジタルツインの実現とそれによる燃焼器の高効率な運用の実現およびエネルギーの有効活用に大きく貢献するものである．
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