| 研究課題/領域番号 |
20K22382
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| 研究機関 | 東北大学 |
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研究代表者 |
Dubey Ajit.Kumar 東北大学, 数理科学連携研究センター, 助教 (40872338)
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| 研究期間 (年度) |
2020-09-11 – 2022-03-31
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| キーワード | Combustion instability / Detonation / Thermoacoustics / Flame acoustic coupling / Knocking / Numerical Simulation / DNS |
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| 研究実績の概要 |
Combustion and sound interaction create interesting phenomena of dancing flames but can also lead to loud noise and failure of various engines. This project aims to get a clear understanding of this dynamics from first principles by comparing experiments and direct numerical simulations (DNS).
Experiments in mesoscale tubes showed complex flame instabilities. Next, we built small scale experiments using combustion tube of length 20 cm and diameter 2 cm suitable for DNS. Instability was affected by ignition energy creating new research direction. New experimental setup is being built to study this. DNS of flame propagation in closed tubes was performed. Next, experiments will be performed with varying ignition energy and DNS will be performed for half-open tube experiments.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
Experiments in long mesoscale diameter tubes revealed that parametric instability observed in wider tubes were suppressed in mesoscale tubes. The generation of thermoacoustic instability is slightly difficult to initiate in small scale experiments particularly in shorter tubes of small diameter. Instability was found to depend on ignition energy of the spark ignition system. The spark ignition generates pressure waves which can also influence the flame instability. This created new directions for research on the effect of ignition energy. New experimental setup was needed to quantify ignition energy in combustion tube experiments. Currently, the setup is being built and experiments will be carried out.
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| 今後の研究の推進方策 |
Experiments with different ignition energy in small scale half-open combustion tube experiments will be performed. Then DNS for flame acoustic interaction in half-open tubes will be performed. Results will be analyzed to get a clear understanding of flame acoustic interactions.
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| 次年度使用額が生じた理由 |
Experiments, simulation and travel for conference
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