2010
DOI: 10.1016/j.combustflame.2010.07.011
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Abstract: a b s t r a c tA detailed analysis of the flow-flame interactions associated with acoustically coupled heat-release rate fluctuations was performed for a 10 kW, CH 4 /air, swirl stabilized flame in a gas turbine model combustor exhibiting self-excited thermo-acoustic oscillations at 308 Hz. High-speed stereoscopic particle image velocimetry, OH planar laser induced fluorescence, and OH* chemiluminescence measurements were performed at a sustained repetition rate of 5 kHz, which was sufficient to resolve the re… Show more

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Cited by 263 publications
(164 citation statements)
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“…Several studies [40,11,10] have shown that the PVC can provoke thermo-acoustic instabilities because the flame position and the recirculation zones change when the PVC is active [10,14]. Forced acoustic oscillations can also lead to a stretching and contracting of the PVC [41]. Moreover, Paschereit et al [12] observed that low amplitude forcing can suppress the PVC, and Moeck et al [15] found the same effect but at high oscillation amplitudes.…”
Section: Introductionmentioning
confidence: 86%
“…Several studies [40,11,10] have shown that the PVC can provoke thermo-acoustic instabilities because the flame position and the recirculation zones change when the PVC is active [10,14]. Forced acoustic oscillations can also lead to a stretching and contracting of the PVC [41]. Moreover, Paschereit et al [12] observed that low amplitude forcing can suppress the PVC, and Moeck et al [15] found the same effect but at high oscillation amplitudes.…”
Section: Introductionmentioning
confidence: 86%
“…2.2.2, along with past research [73,101], have shown that both the azimuthal position of the HVC and the acoustic phase had an important inuence on the rate of heat release. Therefore, understanding the coupled ame and ow dynamics required compilation of statistics as a function of both acoustic (φ a ) and azimuthal position around the HVC (φ h ) [73,101], which was derived from the POD temporal coecient associated to the most energetic turbulent mode. That is, any quantity ζ was decomposed into the linear combination of a long time Table 3.1: List of the dierent cases of the experiment and corresponding equivalence ratio φ, themal power P th , RMS acoustic amplitude p , dominant acoustic frequency f ac , and dominant vortical frequency f v .…”
Section: Doubly Phase Resolved Analysismentioning
confidence: 99%
“…Although this method was successful, it couldn't be implemented in the current research because of the absence of Rayleigh scattering data and no other means of establishing the temperature eld quantitatively. Hence, another method was implemented, as described by Steinberg et al [101]. This method makes use solely of OH PLIF data and knowledge of the OH distribution across a ame front (shown in Fig.…”
Section: Flame Findingmentioning
confidence: 99%
“…Among all helical, shear later disturbances of swirled ows, the most well known is the PVC (precessing vortex core) and it plays a role in many CIs. Experiments [15,[151][152][153] as well as LES [12,14,154,155] showed that PVCs can trigger certain CI modes, disappear when the ame is ignited or appear only for certain ame positions. PVCs can even appear intermittently during CI.…”
Section: Global Stability Of Swirling Owsmentioning
confidence: 99%