Simple Analysis of Flame Dynamics via Flexible Convected Disturbance Models

Ranalli, Joseph; Ferguson, Donald H.; Martin, Christopher R.

doi:10.2514/1.60561

Cited by 2 publications

(7 citation statements)

References 26 publications

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“…Uniquely, in the case of the LSI, these rapid shifts in the phase occurred in both positive and negative directions. Modeling efforts [29] suggest that the direction of the phase shift may be associated with the relative shapes of heat release rate distributions relative to the nature of disturbances that lead to the heat release rate response. According to the same modeling efforts, the low frequency phase slope (e.g., prior to any dynamic effects) has the most ability to indicate the convective velocity.…”

Section: Transfer Functionsmentioning

confidence: 98%

“…Modeling results by the authors and co-workers [29] suggest that the magnitude and phase of the flame transfer function are best characterized by independent parameters. The two length scales are the total convective length of the flame experienced by a disturbance during convection through the flow field, and the HRR weighted center of mass of the flame heat release region measured from the source location of convected disturbances.…”

Section: Introductionmentioning

confidence: 96%

“…O'Connor and Lieuwen [24], along with Acharya et al [30] also describe the impact of interference related to convective perturbations when considering transverse, rather than axial, acoustic excitations. A theoretical modeling effort by the authors and coworkers attempts to provide a framework in which to distinguish the effects interference due to spatial effects and multiple perturbations based on convective analysis [29].…”

Section: Introductionmentioning

confidence: 99%

“…Several investigations have focused on experimental [1.2-25] and theoretical [25][26][27][28][29][30] determinations of flame transfer functions. Common to many of these results is the observation that flame transfer functions exhibit a low-pass filter characteristic and obey a strong scaling relationship with the Strouhal number, a nondimensional frequency if) measuring the ratio between convective and acoustic time scales:…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Flame Frequency Response Functions Under Exhaust Gas Recirculation Conditions

Ranalli

Ferguson

2012

Journal of Engineering for Gas Turbines and Power

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Exhaust gas recirculation has been proposed as a potential strategy for reducing the cost and efficiency penalty associated with postcombustion carbon capture. However, this approach may cause as-yet unresolved effects on the combustion process, including additional potential for the occurrence of thermoacoustic instabilities. Flame dynamics, characterized by the flame transfer function, were measured in traditional swirl stabilized and low-swirl injector combustor configurations, subject to exhaust gas circulation simulated hy N2 and CO2 dilution. The flame transfer functions exhibited behavior consistent with a low-pass filter and showed phase dominated by delay. Flame transfer function frequencies were nondimensionalized using Strouhal number to highlight the convective nature of this delay. Dilution was observed to influence the dynamics primarily through its role in changing the size of the flame, indicating that it plays a similar role in determining the dynamics as changes in the equivalence ratio. Notchlike features in the flame transfer function were shown to be related to interference behaviors associated with the convective nature of the flame response. Some similarities between the two stabilization configurations proved limiting and generalization of the physical behaviors will require additional investigation.

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Section: Transfer Functionsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measurement of Flame Frequency Response Functions Under Exhaust Gas Recirculation Conditions

Ranalli

Ferguson

2012

Journal of Engineering for Gas Turbines and Power

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“…The ame's response is analysed by modelling velocity disturbances and, assuming a uniform rate of reaction, the resulting heat release rate uctuations are calculated from the ame surface perturbations [65]. In general, solutions of this equations have been attempted using simplifying assumptions such as axi-symmetric, purely axial velocity disturbances [18,62].…”

Section: Flame Sheet Modellingmentioning

confidence: 99%

Thermo-acoustic velocity coupling in a swirl stabilized gas turbine model combustor

Caux-Brisebois

Steinberg

Arndt

et al. 2014

Combustion and Flame

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ii Acknowledgements The fact that the cover page of this thesis reads Vincent R. Caux-Brisebois is a misleading proposition that the content of this work is the product of a single man's endeavour.Although nothing would please me more than adding the names of all those who made this possible, the imposed front-to-back limit of 100 pages would hardly allow the table of contents to be published. Nevertheless, I will try to show my appreciation to all those who made this possible in the short space that is available to me.The second name that would go on the cover page of this document is without doubt Prof. Adam M. Steinberg's. In fact, if the degree of MASc. were not conditional to this dissertation, I would likely insist that it be written above mine. Prof. Steinberg is one of the few supervisors that I have known to always work with his door wide open. At any time during his long working hours, any student can walk in and ask any question knowing he or she will be well received, treated fairly, and perhaps most importantly, get the help they need. The work presented in this thesis would not have been possible without his valuable input, guidance, and hard work. Though I could go on about why Prof. Steinberg is a model supervisor, I have to cut this discussion short for the sake of space, and take this opportunity to thank the second reader of this dissertation, Prof. C. P. T. Groth, for taking some time out of his already-full schedule to review this work.

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Simple Analysis of Flame Dynamics via Flexible Convected Disturbance Models

Cited by 2 publications

References 26 publications

Measurement of Flame Frequency Response Functions Under Exhaust Gas Recirculation Conditions

Measurement of Flame Frequency Response Functions Under Exhaust Gas Recirculation Conditions

Thermo-acoustic velocity coupling in a swirl stabilized gas turbine model combustor

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