There are no files associated with this item.
Full metadata record
DC Field | Value | Language |
---|---|---|
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 | - |
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Tel : 052-217-1404 / Email : scholarworks@unist.ac.kr
Copyright (c) 2023 by UNIST LIBRARY. All rights reserved.
ScholarWorks@UNIST was established as an OAK Project for the National Library of Korea.