| DOI | Resolve DOI: https://doi.org/10.1115/GT2008-51402 |
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| Author | Search for: Boulanger, J.1; Search for: Yun, S.1ORCID identifier: https://orcid.org/0000-0001-8028-0214; Search for: Jiang, Leiyong1ORCID identifier: https://orcid.org/0009-0008-0777-7919 |
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| Affiliation | - National Research Council of Canada. NRC Institute for Aerospace Research
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| Format | Text, Article |
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| Conference | ASME Turbo Expo 2008: Power for Land, Sea, and Air, June 9-13, 2008, Berlin, Germany |
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| Subject | CFD; pulsating jet; combustion acoustic |
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| Abstract | Development of low-pollution gas turbine engines has been calling for the development on new technologies. Lean premixed combustion is one of them but tends to be accompanied by combustion instabilities. Some instabilities are caused by coupling between the combustion zone and upstream fuel/air mixing chamber. Acoustic oscillations in the mixing chamber lead to variation of mixture distribution in the combustion zone. On the other hand, the instability itself may improve the turbulent mixing that mitigates these equivalence ratio fluctuations. The goal of this study is to gain knowledge of the fundamental mechanisms of harmonically perturbed jet mixing in air. A jet is considered as a system on which a harmonic analysis is performed. The input parameter is a modulated velocity to induce perturbation. The output parameter is the whole flow field, particularly the statistics of mixture fraction distribution. The tool is a high-order compressible direct numerical simulation code. It is demonstrated that the system can be qualified as a band-pass filter. The efficiency of mixing reaches a maximum for a modulation frequency comparable to the natural mode of a laminar jet. This study suggests that the characteristic frequency of the system to improve mixing can be inferred from the investigation of the natural mode of this system and vice versa. |
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| Publication date | 2009-08-03 |
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| Publisher | American Society of Mechanical Engineers |
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| In | |
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| Peer reviewed | Yes |
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| NRC number | GTL-2008-0021 |
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| NPARC number | 8930927 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | d4b39c52-503a-48a4-a0a2-c3367b26f92f |
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| Record created | 2009-04-23 |
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| Record modified | 2024-12-20 |
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