| DOI | Trouver le DOI : https://doi.org/10.1115/GT2008-51402 |
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| Auteur | Rechercher : Boulanger, J.1; Rechercher : Yun, S.1Identifiant ORCID : https://orcid.org/0000-0001-8028-0214; Rechercher : Jiang, Leiyong1Identifiant ORCID : https://orcid.org/0009-0008-0777-7919 |
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| Affiliation | - Conseil national de recherches Canada. Institut de recherche aérospatiale du CNRC
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| Format | Texte, Article |
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| Conférence | ASME Turbo Expo 2008: Power for Land, Sea, and Air, June 9-13, 2008, Berlin, Germany |
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| Sujet | CFD; pulsating jet; combustion acoustic |
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| Résumé | 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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| Date de publication | 2009-08-03 |
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| Maison d’édition | American Society of Mechanical Engineers |
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| Dans | |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | GTL-2008-0021 |
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| Numéro NPARC | 8930927 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | d4b39c52-503a-48a4-a0a2-c3367b26f92f |
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| Enregistrement créé | 2009-04-23 |
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| Enregistrement modifié | 2024-12-20 |
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