Open AccessSwirler geometry effects (dh/do ratio) on synthetic gas flames. Part 2: dynamic flame behaviour at external y altered acoustic conditions
Author(s) -
Harun Yılmaz,
Ömer Çam,
İlker Yılmaz
Publication year - 2021
Publication title -
energetika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.146
H-Index - 8
eISSN - 1822-8836
pISSN - 0235-7208
DOI - 10.6001/energetika.v67i1.4536
Subject(s) - combustor , materials science , combustion , premixed flame , mechanics , acoustics , flashback , sound pressure , thermodynamics , analytical chemistry (journal) , chemistry , physics , organic chemistry , chromatography
In a combustion device, unsteady heat release causes acoustic energy to increase when acoustic damping (energy loss) is not that effective, and, as a result, thermo-acoustic flame instabilities occur. In this study, effects of the swirler dh/do ratio (at different swirl numbers) on dynamic flame behaviour of the premixed 20%CNG/30%H2/30%CO/20%CO2 mixture under externally altered acoustic boundary conditions and stability limits (flashback and blowout equivalence ratios) of such mixture were investigated in a laboratory-scale variable geometric swirl number combustor. Therefore, swirl generators with different dh/do ratios (0.3 and 0.5) and geometric swirl numbers (0.4, 0.6, 0.8, 1.0 1.2 and 1.4) were designed and manufactured. Acoustic boundary conditions in the combustion chamber were altered using loudspeakers, and flame response to these conditions was perceived using photodiodes and pressure sensors. Dynamic flame behaviour of respective mixture was evaluated using luminous intensity and pressure profiles. Results showed that the dh/do ratio has a minor impact on dynamic flame behaviour.