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Correspondence Between “Stable” Flame Macrostructure and Thermo-acoustic Instability in Premixed Swirl-Stabilized Turbulent Combustion

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Fig. 2 Axial eight-vane swirler with 45 deg vane angle and a streamlined centerbody with a diameter of 9 mm and a 60 deg cone angle
Fig. 4 Correspondence between the observed mean swirling flame configurations (roman numerals) and dynamic mode transitions in the long combustor for methane
Figure 5 shows the numerically predicted resonant frequencies of the initial length combustor as a function of the equivalence  ra-tio (left) and these frequencies when the combustor is shortened by a factor of 10 (right)
Fig. 6 Experimental measurements of the combustors’ natural frequencies, to be compared with the predicted frequencies in Fig
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