Response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream
Experimental study was performed to reveal the response characteristics of a stretched cylindrical diffusion flame to sinusoidal oscillation of air flow velocity. The cylindrical flame used in this study has a convex curvature with respect to air stream and is formed in air stream. The fuel is metha...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2017-08-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/852/83_17-00160/_pdf/-char/en |
| _version_ | 1797988980542668800 |
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| author | Yosuke SUENAGA Hideki YANAOKA Mamoru KIKUCHI Shun SASAKI |
| author_facet | Yosuke SUENAGA Hideki YANAOKA Mamoru KIKUCHI Shun SASAKI |
| author_sort | Yosuke SUENAGA |
| collection | DOAJ |
| description | Experimental study was performed to reveal the response characteristics of a stretched cylindrical diffusion flame to sinusoidal oscillation of air flow velocity. The cylindrical flame used in this study has a convex curvature with respect to air stream and is formed in air stream. The fuel is methane, diluted with nitrogen, and the oxidizer is air. Oscillation frequency f is varied from 5 Hz to 250 Hz. Velocity at the outlet of air supplying nozzle was changed sinusoidally with four speakers. Velocity at the fuel nozzle outlet was kept constant. The air velocity at the nozzle outlet is measured using particle image velocimetry. Flame radius rf, flame thickness δ, and flame luminosity Lf are obtained by using high speed video camera. Results are summarized as follows: Though fluctuation amplitude of the velocity gradient of air stream Δga is constant with increasing f, that of the fuel stream Δgf increases. The fluctuation amplitude of rf varies to quasi-steady at low frequency, while the fluctuation amplitude is reduced with increasing f. Lf does not respond to quasi-steady at low frequency. The fluctuation amplitude of Lf has maximum value at 50 Hz and is larger than that for the steady flame corresponding to the velocity fluctuation. It is considered that this complex change of the flame luminosity with respect to f is related to δ/rf which is associated with the flame curvature effect, ga which affects the flame stretch effect, and gf which impacts fuel transport. |
| first_indexed | 2024-04-11T08:13:00Z |
| format | Article |
| id | doaj.art-c7f69bb2a51041b7b55ff21ddc94e0e3 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T08:13:00Z |
| publishDate | 2017-08-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-c7f69bb2a51041b7b55ff21ddc94e0e32022-12-22T04:35:16ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-08-018385217-0016017-0016010.1299/transjsme.17-00160transjsmeResponse of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air streamYosuke SUENAGA0Hideki YANAOKA1Mamoru KIKUCHI2Shun SASAKI3Department of Systems Innovation Engineering, Iwate UniversityDepartment of Systems Innovation Engineering, Iwate UniversityDepartment of Systems Innovation Engineering, Iwate UniversityMazda Motor CorporationExperimental study was performed to reveal the response characteristics of a stretched cylindrical diffusion flame to sinusoidal oscillation of air flow velocity. The cylindrical flame used in this study has a convex curvature with respect to air stream and is formed in air stream. The fuel is methane, diluted with nitrogen, and the oxidizer is air. Oscillation frequency f is varied from 5 Hz to 250 Hz. Velocity at the outlet of air supplying nozzle was changed sinusoidally with four speakers. Velocity at the fuel nozzle outlet was kept constant. The air velocity at the nozzle outlet is measured using particle image velocimetry. Flame radius rf, flame thickness δ, and flame luminosity Lf are obtained by using high speed video camera. Results are summarized as follows: Though fluctuation amplitude of the velocity gradient of air stream Δga is constant with increasing f, that of the fuel stream Δgf increases. The fluctuation amplitude of rf varies to quasi-steady at low frequency, while the fluctuation amplitude is reduced with increasing f. Lf does not respond to quasi-steady at low frequency. The fluctuation amplitude of Lf has maximum value at 50 Hz and is larger than that for the steady flame corresponding to the velocity fluctuation. It is considered that this complex change of the flame luminosity with respect to f is related to δ/rf which is associated with the flame curvature effect, ga which affects the flame stretch effect, and gf which impacts fuel transport.https://www.jstage.jst.go.jp/article/transjsme/83/852/83_17-00160/_pdf/-char/encombustiondiffusion flamevelocity oscillationflame stretchflame curvature |
| spellingShingle | Yosuke SUENAGA Hideki YANAOKA Mamoru KIKUCHI Shun SASAKI Response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream Nihon Kikai Gakkai ronbunshu combustion diffusion flame velocity oscillation flame stretch flame curvature |
| title | Response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream |
| title_full | Response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream |
| title_fullStr | Response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream |
| title_full_unstemmed | Response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream |
| title_short | Response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream |
| title_sort | response of a stretched cylindrical diffusion flame to a sinusoidal velocity oscillation of air stream |
| topic | combustion diffusion flame velocity oscillation flame stretch flame curvature |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/852/83_17-00160/_pdf/-char/en |
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