Spatially distributed flame transfer functions for predicting combustion dynamics in lean premixed gas turbine combustors

Kim, Kyu Tae; Lee, Jong Guen; Quay, Bryan D.; Santavicca, Domenic A.

doi:10.1016/j.combustflame.2010.04.016

Cited by 151 publications

(38 citation statements)

References 41 publications

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“…Kim et al [6] conducted experiments burning CH 4 /H 2 mixtures in an unstable, variablelength, swirl-stabilized combustor. They measured the flame transfer function, which was used as an input to a lumped acoustic model, to predict instability boundaries as measured by the dominant frequency.…”

Section: Technological Interestmentioning

confidence: 99%

“…(5) and (6). 3 Further, neglecting dissipative terms that are usually higher order, the energy balance for acoustic disturbances reduces to:…”

Section: Rayleigh's Criterionmentioning

confidence: 99%

“…The most difficult to determine in this analysis is the flame transfer function, which models the flame response to either acoustic pressure or velocity fluctuations, i.e., how p or u jumps across the flame. The transfer function can either be analytically derived [20], modeled [21,22] or measured [6,7,23], which is then applied towards stability prediction using linear or nonlinear methods, leading to the complex natural frequency, i.e., ω = ω r + jω i . The real part (ω r ) predicts the oscillation frequency, while the imaginary part (ω i ) indicates the growth rate.…”

Section: Stability Prediction Using the Extended Rayleigh Criterionmentioning

confidence: 99%

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On the phase between pressure and heat release fluctuations for propane/hydrogen flames and its role in mode transitions

Hong

Shanbhogue

Speth

et al. 2013

Combustion and Flame

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This paper presents an experimental investigation into mode-transitions observed in a 50-kW, atmospheric pressure, backward-facing step combustor burning lean premixed C 3 H 8 /H 2 fuel mixtures over a range of equivalence ratios, fuel compositions and preheat temperatures.The combustor exhibits distinct acoustic response and dynamic flame shape (collectively referred to as "dynamic modes") depending on the operating conditions. We simultaneously measure the dynamic pressure and flame chemiluminescence to examine the phase between pressure (p ) and heat release fluctuations (q ) in the observed dynamic modes. Results show that the heat release is in phase with the pressure oscillations (θ qp ≈ 0) at the onset of a dynamic mode, while as the operating conditions change within the mode, the phase grows until it reaches a critical value θ qp = θ c , at which the combustor switches to another dynamic mode. According to the classical Rayleigh criterion, this critical phase (θ c ) should be π/2, whereas our data show that the transition occurs well below this value. A linear acoustic energy balance shows that this critical phase marks the point where acoustic losses across the system boundaries equal the energy addition from the combustion process to the acoustic field. Based on the extended Rayleigh criterion in which the acoustic energy fluxes through the system boundaries as well as the typical Rayleigh source term (p q ) are included, we derive an extended Rayleigh index defined as R e = θ qp /θ c , which varies between 0 and 1. * Corresponding author. 77 Massachusetts Avenue, Room 3-344, Cambridge MA 02139, USA. Fax: +1-617-253-5981. E-mail: ghoniem@mit.edu Preprint submitted to Combustion and Flame June 27, 2013 This index, plotted against a density-weighted strained consumption speed, indicates that the impact of the operating parameters on the dynamic mode selection of the combustor collapses onto a family of curves, which quantify the state of the combustor within a dynamic mode.At R e = 0, the combustor enters a mode, and switches to another as R e approaches 1. The results provide a metric for quantifying the instability margins of fuel-flexible combustors operating at a wide range of conditions.

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Section: Technological Interestmentioning

confidence: 99%

“…(5) and (6). 3 Further, neglecting dissipative terms that are usually higher order, the energy balance for acoustic disturbances reduces to:…”

Section: Rayleigh's Criterionmentioning

confidence: 99%

Section: Stability Prediction Using the Extended Rayleigh Criterionmentioning

confidence: 99%

See 1 more Smart Citation

On the phase between pressure and heat release fluctuations for propane/hydrogen flames and its role in mode transitions

Hong

Shanbhogue

Speth

et al. 2013

Combustion and Flame

View full text Add to dashboard Cite

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“…HereQ andū denote a mean flame power and velocity introduced for scaling purposes. The FTF can be either measured or modeled theoretically or numerically (Ducruix et al, 2000;Külsheimer and Büchner, 2002;Truffin and Poinsot, 2005;Durox et al, 2009;Huber and Polifke, 2009;Kim et al, 2010;Schuermans et al, 2011;Duchaine et al, 2011;Tay-Wo-Chong et al, 2012;Palies et al, 2011b). In a second step, this function can be combined to a model of the system acoustics which is often obtained analytically (Dowling and Stow, 2003;Sattelmayer and Polifke, 2003;Poinsot and Veynante, 2005).…”

Section: Introductionmentioning

confidence: 99%

Combining a Helmholtz solver with the flame describing function to assess combustion instability in a premixed swirled combustor

Silva

Nicoud

Schuller

et al. 2013

Combustion and Flame

139

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“…연소시스템의 각 부분을 균일한 음향 요 소들로 나누고 각 요소간의 경계에서 일치조건을 통 해 전체를 해석하는 lumped network method [3,4], 음 향 섭동에 대한 선형 방정식을 시간 영역 [5,6] 또는 주파수 영역 [7,8]에서 해석하는 acoustic perturbation method, 마지막으로 LES(large eddy simulation)을 이 용한 연소해석 [9,10]으로 분류할 수 있다. 각 해석기 (a) Schematics [16] (b) OSCILOS chamber dimension Fig. 1.…”

Section: 서 론unclassified

A Case Study on Combustion Instability of a Model Lean Premixed Gas Turbine Combustor with Open Source Code OSCILOS

Jin¹,

Song²,

Lee³

2015

Journal of the Korean Society of Combustion

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Combustion instability is a major issue in design and maintenance of gas turbine combustors for efficient operation with low emissions. With the thermoacoustic view point the instability is induced by the interaction of the unsteady heat release of the combustion process and the change in the acoustic pressure in the combustion chamber. In an effort to study the combustion dynamics of gas turbine combustors, Morgans et al (2014) have developed OSCILOS (open source combustion instability low order simulator) code and it is currently available online. In this study the code has been utilized to predict the combustion instability of a reported case for lean premixed gas turbine combustion, and then its prediction results have been compared with the corresponding experimental data. It turned out that both the predicted and the experimental combustion instability results agree well. Further the effects of some typical inlet acoustic boundary conditions on the prediction have been investigated briefly. It is believed that the validity and effectiveness of the open source code is reconfirmed through this benchmark test.

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Spatially distributed flame transfer functions for predicting combustion dynamics in lean premixed gas turbine combustors

Cited by 151 publications

References 41 publications

On the phase between pressure and heat release fluctuations for propane/hydrogen flames and its role in mode transitions

On the phase between pressure and heat release fluctuations for propane/hydrogen flames and its role in mode transitions

Combining a Helmholtz solver with the flame describing function to assess combustion instability in a premixed swirled combustor

A Case Study on Combustion Instability of a Model Lean Premixed Gas Turbine Combustor with Open Source Code OSCILOS

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