Investigations of Premixed Flames Driven Acoustic in a Combustor
碩士 === 淡江大學 === 機械工程研究所 === 81 === The research is concerned with the theoretical and experi- mental investigations of sound generation by premixed flames located on the sidewall of a long rectangular duct. The experi- mental studies were...
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ndltd-TW-081TKU004890092016-02-10T04:08:51Z http://ndltd.ncl.edu.tw/handle/38058232672643980412 Investigations of Premixed Flames Driven Acoustic in a Combustor 燃燒室中預混火燄誘導聲波振盪之研究 Hsin-Cherng Lee 李新成 碩士 淡江大學 機械工程研究所 81 The research is concerned with the theoretical and experi- mental investigations of sound generation by premixed flames located on the sidewall of a long rectangular duct. The experi- mental studies were conducted by using microphone probes and photomultiplier tube. These studies reveal that the self- excited oscillatory flame radiation and the induced pressure oscillation were observed only at certain equivalence ratios which are between 0.64 and 0.81 for the mixture(LPG + air) flow velocity in the vicinity of 8 cm/sec. In addition, the flame oscillates with several frequencies and the main frequencies of the flame oscillations decrease as the equivalence ratio decrease. However, the acoustic oscillations could be enhanced when the frequencies of the flame oscillations are close to the harmo- nics of the experimental duct. From the theoretical analysis and experimenatal observations, it was shown that the flame induced acoustic oscillations depend on the flame location with respect to the standing wave pattern within the duct. Driving of acoustic oscillations occurred when the flame was located close to the pressure antinode. On the other hand, the acoustic oscillations were damped when the flame was located near the pressure node. Finally, the results of this research reveal that the predicted pressure spectra are in good agreement with the experimental observations. Tseng-Yuan Chen 陳增源 1993 學位論文 ; thesis 114 zh-TW |
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碩士 === 淡江大學 === 機械工程研究所 === 81 === The research is concerned with the theoretical and experi-
mental investigations of sound generation by premixed flames
located on the sidewall of a long rectangular duct. The experi-
mental studies were conducted by using microphone probes and
photomultiplier tube. These studies reveal that the self-
excited oscillatory flame radiation and the induced pressure
oscillation were observed only at certain equivalence ratios
which are between 0.64 and 0.81 for the mixture(LPG + air) flow
velocity in the vicinity of 8 cm/sec. In addition, the flame
oscillates with several frequencies and the main frequencies
of the flame oscillations decrease as the equivalence ratio
decrease. However, the acoustic oscillations could be enhanced
when the frequencies of the flame oscillations are close to the
harmo- nics of the experimental duct. From the theoretical
analysis and experimenatal observations, it was shown that the
flame induced acoustic oscillations depend on the flame
location with respect to the standing wave pattern within the
duct. Driving of acoustic oscillations occurred when the flame
was located close to the pressure antinode. On the other hand,
the acoustic oscillations were damped when the flame was
located near the pressure node. Finally, the results of this
research reveal that the predicted pressure spectra are in good
agreement with the experimental observations.
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author2 |
Tseng-Yuan Chen |
author_facet |
Tseng-Yuan Chen Hsin-Cherng Lee 李新成 |
author |
Hsin-Cherng Lee 李新成 |
spellingShingle |
Hsin-Cherng Lee 李新成 Investigations of Premixed Flames Driven Acoustic in a Combustor |
author_sort |
Hsin-Cherng Lee |
title |
Investigations of Premixed Flames Driven Acoustic in a Combustor |
title_short |
Investigations of Premixed Flames Driven Acoustic in a Combustor |
title_full |
Investigations of Premixed Flames Driven Acoustic in a Combustor |
title_fullStr |
Investigations of Premixed Flames Driven Acoustic in a Combustor |
title_full_unstemmed |
Investigations of Premixed Flames Driven Acoustic in a Combustor |
title_sort |
investigations of premixed flames driven acoustic in a combustor |
publishDate |
1993 |
url |
http://ndltd.ncl.edu.tw/handle/38058232672643980412 |
work_keys_str_mv |
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