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유춘상

Yoo, Chun Sang
Combustion and Propulsion Lab.
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dc.citation.endPage 481 -
dc.citation.startPage 453 -
dc.citation.title JOURNAL OF FLUID MECHANICS -
dc.citation.volume 640 -
dc.contributor.author Yoo, Chun Sang -
dc.contributor.author Sankaran, R. -
dc.contributor.author Chen, J. H. -
dc.date.accessioned 2023-12-22T07:37:03Z -
dc.date.available 2023-12-22T07:37:03Z -
dc.date.created 2015-07-02 -
dc.date.issued 2009-12 -
dc.description.abstract Direct numerical simulation (DNS) of the near field of a three-dimensional spatially developing turbulent lifted hydrogen jet flame in heated coflow is performed with a detailed mechanism to determine the stabilization mechanism and the flame structure. The DNS was performed at a jet Reynolds number of 11000 with over 940 million grid points. The results show that auto-ignition in a fuel-lean mixture at the flame base is the main Source of stabilization of the lifted Jet flame. A chemical flux analysis shows the occurrence of near-isothermal chemical chain branching preceding thermal runaway upstream of the stabilization point, indicative of hydrogen auto-ignition in the second limit. The Damkohler number and key intemediate-species behaviour near the leading edge of the lifted flame also verify that auto-ignition occurs at the flame base. At the lifted-flame base, it is found that heat release occurs predominantly through ignition in which the gradients of reactants are opposed. Downstream of the flame base, both rich-premixed and non-premixed flames develop and coexist with auto-ignition. In addition to auto-ignition, Lagrangian tracking of the flame base reveals the passage of large-scale flow Structures and their correlation with the fluctuations of the flame base. In particular, the relative position of the flame base and the coherent flow structure induces a cyclic motion of the flame base in the transverse and axial directions about a mean lift-off height. This is confirmed by Lagrangian tracking of key scalars, heat release rate and velocity at the stabilization point -
dc.identifier.bibliographicCitation JOURNAL OF FLUID MECHANICS, v.640, pp.453 - 481 -
dc.identifier.doi 10.1017/S0022112009991388 -
dc.identifier.issn 0022-1120 -
dc.identifier.scopusid 2-s2.0-76249128676 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/11840 -
dc.identifier.url http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=6774360&fileId=S0022112009991388 -
dc.identifier.wosid 000273185500020 -
dc.language 영어 -
dc.publisher CAMBRIDGE UNIV PRESS -
dc.title Three-dimensional direct numerical simulation of a turbulent lifted hydrogen jet flame in heated coflow: flame stabilization and structure -
dc.type Article -
dc.description.journalRegisteredClass scopus -

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