The effect of swirl intensity on flame propagation behavior in lean premixed burner
In gas turbine engines, combustion temperature increases in order to reduce CO2 emissions and to improve thermal efficiency. However, at the same time, this leads to the increase of nitrogen oxide (NOx) emissions. Lean premixed combustion is one of the most effective techniques to reduce NOx emissio...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2015-06-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/81/827/81_14-00624/_pdf/-char/en |
| _version_ | 1828192846748844032 |
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| author | Yuichi ICHIKAWA Masaharu KOMIYAMA Atsushi KOYAMA |
| author_facet | Yuichi ICHIKAWA Masaharu KOMIYAMA Atsushi KOYAMA |
| author_sort | Yuichi ICHIKAWA |
| collection | DOAJ |
| description | In gas turbine engines, combustion temperature increases in order to reduce CO2 emissions and to improve thermal efficiency. However, at the same time, this leads to the increase of nitrogen oxide (NOx) emissions. Lean premixed combustion is one of the most effective techniques to reduce NOx emissions. However, lean premixed combustors have a narrow stable combustion range compared with diffusion combustors and have a risk of flashback. Flashback of flame into the fuel nozzle causes serious damage to combustors. In this study, we present characteristics of unsteady flame behavior in a premixed burner with swirling flow. A variable swirler is used in order to investigate the flame behavior under different swirl intensity. The relationship between the flame behavior and flow fields in the premixer have been captured by applying high-speed particle image velocimetry (PIV) measurement. It is clarified that flow velocity of unburned gas upstream the flame tip has effect on flame propagation velocity regardless of swirl intensity from the results of PIV measurement in flashback limit. From the results of PIV measurement in blow-off limit, we clarified the possibility of flame extinction upstream the flame tip in high swirl intensity. It is conceivable that this is because flame is stretched by a steep velocity gradient. |
| first_indexed | 2024-04-12T08:59:09Z |
| format | Article |
| id | doaj.art-4de8cc4ef10c4172a149a3fd50d41be2 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T08:59:09Z |
| publishDate | 2015-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-4de8cc4ef10c4172a149a3fd50d41be22022-12-22T03:39:17ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612015-06-018182714-0062414-0062410.1299/transjsme.14-00624transjsmeThe effect of swirl intensity on flame propagation behavior in lean premixed burnerYuichi ICHIKAWA0Masaharu KOMIYAMA1Atsushi KOYAMA2Department of Mechanical Engineering, Graduate School of Engineering, Osaka UniversityDepartment of Mechanical Engineering, Graduate School of Engineering, Osaka UniversityDepartment of Mechanical Engineering, Graduate School of Engineering, Osaka UniversityIn gas turbine engines, combustion temperature increases in order to reduce CO2 emissions and to improve thermal efficiency. However, at the same time, this leads to the increase of nitrogen oxide (NOx) emissions. Lean premixed combustion is one of the most effective techniques to reduce NOx emissions. However, lean premixed combustors have a narrow stable combustion range compared with diffusion combustors and have a risk of flashback. Flashback of flame into the fuel nozzle causes serious damage to combustors. In this study, we present characteristics of unsteady flame behavior in a premixed burner with swirling flow. A variable swirler is used in order to investigate the flame behavior under different swirl intensity. The relationship between the flame behavior and flow fields in the premixer have been captured by applying high-speed particle image velocimetry (PIV) measurement. It is clarified that flow velocity of unburned gas upstream the flame tip has effect on flame propagation velocity regardless of swirl intensity from the results of PIV measurement in flashback limit. From the results of PIV measurement in blow-off limit, we clarified the possibility of flame extinction upstream the flame tip in high swirl intensity. It is conceivable that this is because flame is stretched by a steep velocity gradient.https://www.jstage.jst.go.jp/article/transjsme/81/827/81_14-00624/_pdf/-char/enlean premixed combustionswirling flowflashbackflame extinctionhigh-speed piv |
| spellingShingle | Yuichi ICHIKAWA Masaharu KOMIYAMA Atsushi KOYAMA The effect of swirl intensity on flame propagation behavior in lean premixed burner Nihon Kikai Gakkai ronbunshu lean premixed combustion swirling flow flashback flame extinction high-speed piv |
| title | The effect of swirl intensity on flame propagation behavior in lean premixed burner |
| title_full | The effect of swirl intensity on flame propagation behavior in lean premixed burner |
| title_fullStr | The effect of swirl intensity on flame propagation behavior in lean premixed burner |
| title_full_unstemmed | The effect of swirl intensity on flame propagation behavior in lean premixed burner |
| title_short | The effect of swirl intensity on flame propagation behavior in lean premixed burner |
| title_sort | effect of swirl intensity on flame propagation behavior in lean premixed burner |
| topic | lean premixed combustion swirling flow flashback flame extinction high-speed piv |
| url | https://www.jstage.jst.go.jp/article/transjsme/81/827/81_14-00624/_pdf/-char/en |
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