Large-Eddy Simulation of Combustion Dynamics of Lean-Premixed Swirl-Stabilized Combustor

Huang, Ying; Sung, Hong-Gye; Hsieh, Shih-Yang; Yang, Vigor

doi:10.2514/2.6194

Cited by 177 publications

(91 citation statements)

References 58 publications

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“…By giving access to the largest structures of reacting flows, LES has opened the path to full numerical studies of unsteady phenomena such as ignition [2] and combustion instabilities [13,26,29,31]. Using compressible LES solvers has also made studies of thermoacoustic phenomena possible [11,32].…”

Section: Introductionmentioning

confidence: 99%

Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers

Wolf

Balakrishnan²,

Staffelbach³

et al. 2011

Flow Turbulence Combust

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Open Archive TOULOUSE Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract Great prominence is put on the design of aeronautical gas turbines due to increasingly stringent regulations and the need to tackle rising fuel prices. This drive towards innovation has resulted sometimes in new concepts being prone to combustion instabilities. In the particular field of annular combustion chambers, these instabilities often take the form of azimuthal modes. To predict these modes, one must compute the full combustion chamber, which remained out of reach until very recently and the development of massively parallel computers. Since one of the most limiting factors in performing Large Eddy Simulation (LES) of real combustors is estimating the adequate grid, the effects of mesh resolution are investigated by computing full annular LES of a realistic helicopter combustion chamber on three grids, respectively made of 38, 93 and 336 million elements. Results are compared in terms of mean and fluctuating fields. LES captures self-established azimuthal modes. The presence and structure of the modes is discussed. This study therefore highlights the potential of LES for studying combustion instabilities in annular gas turbine combustors.

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Section: Introductionmentioning

confidence: 99%

Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers

Wolf

Balakrishnan²,

Staffelbach³

et al. 2011

Flow Turbulence Combust

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“…Differences in frequency or amplitude may occur when the temperature field and the FTF in the simulation only partially match those in the experiment, but the simulation can usually be used for further investigation of the thermoacoustic mode. There are numerous studies of combustion instabilities that illustrate that LES with adiabatic walls can show a reasonable agreement with experiments: the study on a lean-premixed swirl combustor by Huang et al [8] , the LES-studies on the PRECCIN-STA configuration [9][10][11] , the massively parallel LES of a realistic helicopter combustion chamber by Wolf et al [12] , LESs of model rocket combustors (Garby et al [13] , Urbano et al [14] ) or the LESstudies of bluff-body stabilized flames by Li et al [15] and Ghani et al [16] .…”

Section: Introductionmentioning

confidence: 99%

“…• Type 1: Adiabatic walls: the majority of recent LESs simply consider the walls to be adiabatic [8][9][10][11][12][13][14][15][16][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

Kraus

Selle

Poinsot

2018

Combustion and Flame

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Large eddy simulations (LES) of combustion instabilities are often performed with simplified thermal wall boundary conditions, typically adiabatic walls. However, wall temperatures directly affect the gas temperatures and therefore the sound speed field. They also control the flame itself, its stabilization characteristics and its response to acoustic waves, changing the flame transfer functions (FTFs) of many combustion chambers. This paper presents an example of LES of turbulent flames fully coupled to a heat conduction solver providing the temperature in the combustor walls. LES results obtained with the fully coupled approach are compared to experimental data and to LES performed with adiabatic walls for a swirled turbulent methane/air burner installed at Engler-Bunte-Institute, Karlsruhe Institute of Technology and German Aerospace Center (DLR) in Stuttgart. Results show that the fully coupled approach provides reasonable wall temperature estimations and that heat conduction in the combustor walls strongly affects both the mean state and the unstable modes of the combustor. The unstable thermoacoustic mode observed experimentally at 750 Hz is captured accurately by the coupled simulation but not by the adiabatic one, suggesting that coupling LES with heat conduction solvers within combustor walls may be necessary in other configurations in order to capture flame dynamics.

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“…This suggests that a different mechanism of flame transition to the ORZ may exist, as also noted by the same authors. Huang et al [13] performed large eddy simulations (LES) to investigate flame dynamics in a swirl stabilized combustor. They showed that by increasing the inlet temperature, the flameoriginally stabilized along the ISL -flashes back near the wall to reach the ORZ and ultimately stabilizes along the ISL as well, leading to a "tulip" like M-flame.…”

Section: Introductionmentioning

confidence: 99%

Transition From a Single to a Double Flame Structure in Swirling Reacting Flows: Mechanism, Dynamics, and Effect of Thermal Boundary Conditions

Taamallah

Shanbhogue

Sanusi

et al. 2015

Volume 5C: Heat Transfer

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We examine experimentally the transition from a single flame stabilized along the inner shear layer (ISL) to a double flame stabilized along both the inner and the outer shear layers (OSL) and spreading over the outside recirculation zone (ORZ) in a fully premixed swirl-stabilized combustor. This work is mainly driven by previous studies demonstrating the link between this transition in the flame macrostructure and the onset of thermo-acoustic instabilities [1,2]. Here, we examine the transition mechanism under thermo-acoustically stable conditions as well as the dominant flow and flame dynamics associated with it. In addition, we explore the role of changing the thermal boundary conditions around the ORZ and its effect on the presence or absence of the flame there. We start by analyzing the two flames bounding the transition, namely the single conical flame stabilized along the ISL (flame III 1 ) and the double conical flames with reactions * Corresponding author -email: sofiene@mit.edu 1 Same flame configuration nomenclature as in [1][2][3][4][5][6] taking place in the ORZ (flame IV). A dual chemiluminescence approach -using two cameras with a narrow field of view focused on the ORZ -is undertaken to track the progression of the flame as it reaches the ORZ. During the transition, the flame front, initially stabilized along the ISL, is entrained by OSL vortices close to where the turbulent jet impinges on the wall, leading to the ignition of the reactants in the ORZ and the ultimately the stabilization of the flame along the outer shear layer (OSL). This ORZ flame is also subject to extinction when the equivalence ratio (φ ) is between values corresponding to flames III and IV. For φ lower than the critical transitional value, the flame kernel originating from the ISL-stabilized flame is shown to reach the ORZ but fails to grow and quickly disappears. For φ higher than the critical value, the flame kernel expands as it is advected by the ORZ flow and ultimately ignites the reactants recirculating in the ORZ. Sudden and extreme peak-to-peak values of the overall heat release rate are found to be concomitant with the ignition and extinction of the ORZ reactants. Finally, Different ther-

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Large-Eddy Simulation of Combustion Dynamics of Lean-Premixed Swirl-Stabilized Combustor

Cited by 177 publications

References 58 publications

Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers

Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

Transition From a Single to a Double Flame Structure in Swirling Reacting Flows: Mechanism, Dynamics, and Effect of Thermal Boundary Conditions

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