Large eddy simulation calculated flame dynamics of one F-class gas turbine combustor

Yang, Yang; Liu, Xiao; Zhang, Zhihao

doi:10.1016/j.fuel.2019.116451

Cited by 24 publications

(6 citation statements)

References 22 publications

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“…The discrete random binary signal (DRBS) was recommended [12]. This method has already been applied to calculate the FTF for the swirl flame [34] and industrial combustors [47]. Figure 3 shows the excitation signal with an amplitude of 10%.…”

Section: V-gutter Geometry and The Numerical Methodsmentioning

confidence: 99%

Analysis of V-Gutter Reacting Flow Dynamics Using Proper Orthogonal and Dynamic Mode Decompositions

2020

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The current work is focused on investigating the potential of data-driven post-processing techniques, including proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) for flame dynamics. Large-eddy simulation (LES) of a V-gutter premixed flame was performed with two Reynolds numbers. The flame transfer function (FTF) was calculated. The POD and DMD were used for the analysis of the flame structures, wake shedding frequency, etc. The results acquired by different methods were also compared. The FTF results indicate that the flames have proportional, inertial, and delay components. The POD method could capture the shedding wake motion and shear layer motion. The excited DMD modes corresponded to the shear layer flames’ swing and convect motions in certain directions. Both POD and DMD could help to identify the wake shedding frequency. However, this large-scale flame oscillation is not presented in the FTF results. The negative growth rates of the decomposed mode confirm that the shear layer stabilized flame was more stable than the flame possessing a wake instability. The corresponding combustor design could be guided by the above results.

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Section: V-gutter Geometry and The Numerical Methodsmentioning

confidence: 99%

Analysis of V-Gutter Reacting Flow Dynamics Using Proper Orthogonal and Dynamic Mode Decompositions

2020

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“…Without explicitly comprehending the governing equation, DMD is an effective method that can reveal dynamic process through the operator matrix [13][14][15]. The algorithm of DMD contains two aspects: one is using the singular value decomposition (SVD) to reduce the computational cost of matrix decomposition.…”

Section: Dynamic Mode Decompositionmentioning

confidence: 99%

“…These characteristics reflected by the flame transfer function (FTF) are identified from responsive time series by imposing suitable external excitation at the inlet. The method used to calculate FTF was reported elsewhere [12,13].…”

Section: Introductionmentioning

confidence: 99%

Design and Decomposition Analysis of Mixing Zone Structures on Flame Dynamics for a Swirl Burner

Yang

2020

Energies

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The recirculation zone and the swirl flame behavior can be influenced by the burner exit shape, and few studies have been made into this structure. Large eddy simulation was carried out on 16 cases to distinguish critical geometry factors. The time series of the heat release rate were decomposed using seasonal-trend decomposition procedure to exclude the effect of short physical time. Dynamic mode decomposition (DMD) was performed to separate flame structures. The frequency characteristics extracted from the DMD modes were compared with those from the flame transfer functions. Results show that the flame cases can be categorized into three types, all of which are controlled by a specific geometric parameter. Except one type of flame, they show nonstationary behavior by the Kwiatkowski–Phillips–Schmidt–Shin test. The frequency bands corresponding to the coherent structures are identified. The flame transfer function indicates that the flame can respond to external excitation in the frequency range 100–300 Hz. The DMD modes capture the detailed flame structures. The higher frequency bands can be interpolated as the streamwise vortices and shedding vortices. The DMD modes, which correspond to the bands of flame transfer functions, can be estimated as streamwise vortices at the edges.

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“…Therefore, combustion instability must be considered in the combustor design. [11][12][13] Apart from theoretical and experimental approaches, the rapid development of computational fluid dynamics (CFD) since the 1990s have made high-fidelity numerical simulations of combustion instability possible. 14 Since 2000s, the large eddy simulation (LES) model to study combustion instability is rapidly popularity.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Han et al 25 captured the full FDF by LES, to predict the limit cycle characteristics of a combustor, developed at Cambridge University. Yang et al 13 obtained the linear FTF by system identification, to identify the potential risks of thermoacoustic oscillation in a F-class GT combustor. Based on the FTF or FDF, low-order network models and Helmholtz solvers are usually used for further acoustic research.…”

Section: Introductionmentioning

confidence: 99%

Investigation on flame dynamic characteristics to air-inlet excitation in a gas turbine model combustor

Zhang

Liu

Zheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The combustion characteristics for a gas turbine (GT) model combustor in air-inlet excitation are studied by Large Eddy Simulation (LES). Time series of heat release rate (HRR) fluctuation is captured during simulation. The precessing vortex core (PVC) structure is shown by pressure iso-surface, and the single/double helix branches of PVC alternately evolve in one forcing cycle. With the rotation of PVC, the high-speed ring zone (HSRZ) is periodically squeezed, and large-scale vortex roll-up results from that. The flame root structure is also significantly affected by PVC, which is one of the reasons for the HRR fluctuation. With the increase of the forcing amplitude, the flame response is divided into three parts. The linear growth zone and secondary rising zone are separated by saturation plateau. The flame dynamics analysis shows that the change of the flame structures and flame front oscillation modes are the apparent mechanism of the nonlinear flame response appearance.

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Large eddy simulation calculated flame dynamics of one F-class gas turbine combustor

Cited by 24 publications

References 22 publications

Analysis of V-Gutter Reacting Flow Dynamics Using Proper Orthogonal and Dynamic Mode Decompositions

Analysis of V-Gutter Reacting Flow Dynamics Using Proper Orthogonal and Dynamic Mode Decompositions

Design and Decomposition Analysis of Mixing Zone Structures on Flame Dynamics for a Swirl Burner

Investigation on flame dynamic characteristics to air-inlet excitation in a gas turbine model combustor

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