Flamelet regime characterization for non-premixed turbulent combustion simulations
Regime characterization has been shown to be an insightful technique in the study of turbulent combustion, providing useful information about the relation between fundamental combustion modes and physical scales that require consideration. Regime diagrams can guide the appropriate utilization of com...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2018
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| Online Access: | https://hdl.handle.net/10356/88041 http://hdl.handle.net/10220/44535 |
| _version_ | 1826110180226498560 |
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| author | Chan, Wai Lee Ihme, Matthias |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Chan, Wai Lee Ihme, Matthias |
| author_sort | Chan, Wai Lee |
| collection | NTU |
| description | Regime characterization has been shown to be an insightful technique in the study of turbulent combustion, providing useful information about the relation between fundamental combustion modes and physical scales that require consideration. Regime diagrams can guide the appropriate utilization of combustion models, which is critical for the accuracy of numerical simulations of turbulent reacting flows. In the present study, a flamelet regime diagram is developed to assess the applicability of various diffusion flamelet models with respect to the local grid resolution and underlying flow/flame structure. The flamelet regime parameter is defined such that it can be unambiguously determined with fully resolved data, as in the case of direct numerical simulations (DNS), and adequately estimated from filtered information of large-eddy simulations (LES). To this end, the flamelet regime diagram is studied through an a priori analysis of a DNS dataset of a turbulent lifted hydrogen jet flame in a heated coflow. Findings from this analysis verify the length-scale arguments that are based on the concepts of inner-reaction zone thickness and dissipation element, upon which the regime diagram is constructed on. In addition, the relevance of the regime diagram to the numerical grid size enables it to act as a guiding tool for model selection in non-premixed combustion LES. |
| first_indexed | 2024-10-01T02:30:12Z |
| format | Journal Article |
| id | ntu-10356/88041 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:30:12Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/880412023-03-04T17:14:39Z Flamelet regime characterization for non-premixed turbulent combustion simulations Chan, Wai Lee Ihme, Matthias School of Mechanical and Aerospace Engineering Flamelet Modeling Non-premixed Turbulent Flame Regime characterization has been shown to be an insightful technique in the study of turbulent combustion, providing useful information about the relation between fundamental combustion modes and physical scales that require consideration. Regime diagrams can guide the appropriate utilization of combustion models, which is critical for the accuracy of numerical simulations of turbulent reacting flows. In the present study, a flamelet regime diagram is developed to assess the applicability of various diffusion flamelet models with respect to the local grid resolution and underlying flow/flame structure. The flamelet regime parameter is defined such that it can be unambiguously determined with fully resolved data, as in the case of direct numerical simulations (DNS), and adequately estimated from filtered information of large-eddy simulations (LES). To this end, the flamelet regime diagram is studied through an a priori analysis of a DNS dataset of a turbulent lifted hydrogen jet flame in a heated coflow. Findings from this analysis verify the length-scale arguments that are based on the concepts of inner-reaction zone thickness and dissipation element, upon which the regime diagram is constructed on. In addition, the relevance of the regime diagram to the numerical grid size enables it to act as a guiding tool for model selection in non-premixed combustion LES. Accepted version 2018-03-09T05:31:37Z 2019-12-06T16:54:44Z 2018-03-09T05:31:37Z 2019-12-06T16:54:44Z 2017 Journal Article Chan, W. L., & Ihme, M. (2017). Flamelet regime characterization for non-premixed turbulent combustion simulations. Combustion and Flame, 186, 220-235. 0010-2180 https://hdl.handle.net/10356/88041 http://hdl.handle.net/10220/44535 10.1016/j.combustflame.2017.08.003 en Combustion and Flame © 2017 The Combustion Institute (published by Elsevier). This is the author created version of a work that has been peer reviewed and accepted for publication in Combustion and Flame, published by Elsevier on behalf of The Combustion Institute. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.combustflame.2017.08.003]. 25 p. application/pdf |
| spellingShingle | Flamelet Modeling Non-premixed Turbulent Flame Chan, Wai Lee Ihme, Matthias Flamelet regime characterization for non-premixed turbulent combustion simulations |
| title | Flamelet regime characterization for non-premixed turbulent combustion simulations |
| title_full | Flamelet regime characterization for non-premixed turbulent combustion simulations |
| title_fullStr | Flamelet regime characterization for non-premixed turbulent combustion simulations |
| title_full_unstemmed | Flamelet regime characterization for non-premixed turbulent combustion simulations |
| title_short | Flamelet regime characterization for non-premixed turbulent combustion simulations |
| title_sort | flamelet regime characterization for non premixed turbulent combustion simulations |
| topic | Flamelet Modeling Non-premixed Turbulent Flame |
| url | https://hdl.handle.net/10356/88041 http://hdl.handle.net/10220/44535 |
| work_keys_str_mv | AT chanwailee flameletregimecharacterizationfornonpremixedturbulentcombustionsimulations AT ihmematthias flameletregimecharacterizationfornonpremixedturbulentcombustionsimulations |