TY - GEN
T1 - Effect of swirler configuration on noise generated by swirling flames and flows
AU - Singh, Kapil K.
AU - Mongeau, Luc
AU - Frankel, Steven H.
AU - Gore, Jay P.
PY - 2005
Y1 - 2005
N2 - Most gas turbine engines feature swirl combustors to achieve stable, efficient, and clean combustion. These exhibit instabilities characterized by vortex breakdown and the emergence of a precessing vortex core (PVC). The combustion dynamiCS in these systems are caused by interactions between the unsteady heat release with the temporal and spatial inhomogeneity, and unsteady fluid mechanical phenomena of vortex breakdown and PVC. Before understanding the dynamiCS of enclosed swirling flows and flames, it is first imperative to comprehend the plenum pressure fluctuations and radiated sound from open swirling flows and flames. This paper investigates effects of swirler configuration by addition of a second swirler with co-and counter-rotation to a single swirler configuration. A radial swirler premixer with converging-diverging nozzle was used. Methane partially premixed flames were scrutinized. External sound and internal plenum pressure fluctuations spectra were simultaneously measured. The PVC structure in the counter-rotation double swirler flow was considerably weaker than single and co-rotating double swirlers. The addition of second swirler reduced the effective swirl number of the swirler premixer with counter-rotation having a stronger impact thereby reducing the PVC frequency. The counter-rotating double swirler flames were the noisiest. The co-rotating double swirler flames generated least noise with at least an order of magnitude lower sound and pressure fluctuations spectral amplitudes compared to single and counter-rotating double swirlers.
AB - Most gas turbine engines feature swirl combustors to achieve stable, efficient, and clean combustion. These exhibit instabilities characterized by vortex breakdown and the emergence of a precessing vortex core (PVC). The combustion dynamiCS in these systems are caused by interactions between the unsteady heat release with the temporal and spatial inhomogeneity, and unsteady fluid mechanical phenomena of vortex breakdown and PVC. Before understanding the dynamiCS of enclosed swirling flows and flames, it is first imperative to comprehend the plenum pressure fluctuations and radiated sound from open swirling flows and flames. This paper investigates effects of swirler configuration by addition of a second swirler with co-and counter-rotation to a single swirler configuration. A radial swirler premixer with converging-diverging nozzle was used. Methane partially premixed flames were scrutinized. External sound and internal plenum pressure fluctuations spectra were simultaneously measured. The PVC structure in the counter-rotation double swirler flow was considerably weaker than single and co-rotating double swirlers. The addition of second swirler reduced the effective swirl number of the swirler premixer with counter-rotation having a stronger impact thereby reducing the PVC frequency. The counter-rotating double swirler flames were the noisiest. The co-rotating double swirler flames generated least noise with at least an order of magnitude lower sound and pressure fluctuations spectral amplitudes compared to single and counter-rotating double swirlers.
UR - http://www.scopus.com/inward/record.url?scp=84881583524&partnerID=8YFLogxK
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AN - SCOPUS:84881583524
SN - 9781627481496
T3 - 12th International Congress on Sound and Vibration 2005, ICSV 2005
SP - 1729
EP - 1736
BT - 12th International Congress on Sound and Vibration 2005, ICSV 2005
T2 - 12th International Congress on Sound and Vibration 2005, ICSV 2005
Y2 - 11 July 2005 through 14 July 2005
ER -