Volume 4B: Combustion, Fuels and Emissions 2014
DOI: 10.1115/gt2014-27266
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Abstract: The prediction of dynamic instability remains an open and important issue in the development of gas turbine systems, particularly those constrained by emissions limitations. The existence and characteristics of dynamic instability are known to be functions of combustor geometry, flow conditions, and combustion parameters, but the form of dependence is not well understood. By modifying the acoustic boundary conditions, changes in flame and flow structure due to inlet parameters can be studied independent of the… Show more

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Cited by 6 publications
(9 citation statements)
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“…This approach showed that the transition from configuration III to IV is associated with these frequency bands, as well. In addition, the low frequency band was also linked to changes in the IRZ structure [25]. Low frequency motion of the IRZ has been previously highlighted in the bubble-type vortex breakdown [14].…”
Section: Transition To Orz Flame (Iii To Iv)mentioning
confidence: 93%
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“…This approach showed that the transition from configuration III to IV is associated with these frequency bands, as well. In addition, the low frequency band was also linked to changes in the IRZ structure [25]. Low frequency motion of the IRZ has been previously highlighted in the bubble-type vortex breakdown [14].…”
Section: Transition To Orz Flame (Iii To Iv)mentioning
confidence: 93%
“…It was also found to be dominated by hydrodynamics and not fuel dependent [24]. The two frequency bands observed here using flame chemiluminescence data were also confirmed based on the velocity field: we performed a dynamic mode decomposition (DMD) of the instantaneous PIV measurements [25] to extract dominant dynamics of the reacting flow for the different flame macrostructures. This approach showed that the transition from configuration III to IV is associated with these frequency bands, as well.…”
Section: Transition To Orz Flame (Iii To Iv)mentioning
confidence: 99%
“…Figure 9 shows mean flow structures where the flame is stabilized along the inner shear layer (f = 0.60, (a)) or it is stabilized along both the inner and outer shear layer (f = 0.65, (b)). Details are shown in elsewhere [9]. Strain rates along the outer shear layer are higher than those along the inner shear layer in both cases.…”
Section: Computationmentioning
confidence: 81%
“…Prior PIV experiments (Ref. 9) showed that the strains along the outer shear layer are mostly higher than along the inner shear layer. Premixed twin flame calculations at this equivalence ratio show that the extinction strain rate is higher in the oxy than in the air flame, which may help explain why oxy-flames persist on the outer shear layer with higher strain rate.…”
Section: Resultsmentioning
confidence: 99%
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