Prediction of Premixed Flame Dynamics Using Large Eddy Simulation With Tabulated Chemistry and Eulerian Stochastic Fields

Avdonin, Alexander; Javareshkian, Alireza; Polifke, Wolfgang

doi:10.1115/1.4044996

Cited by 2 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At this purpose, several numerical methods have been proposed over the last decades, aiming also at reducing the extremely high experimental costs related to this kind of investigation [9]. The generation of the Flame Transfer Function (coupled with an acoustic solver) correlating the flame response to small perturbations of the acoustic field, is the most used approach [10][11][12]. Unfortunately, this method is not able to predict the non-linear effects and provide reliable and accurate information about the limit cycle saturation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Characterization of the Self-Excited Dynamics Behavior of a Technically Premixed Burner

Meloni¹,

Gori²,

Riccio³

et al. 2022

Volume 3B: Combustion, Fuels, and Emissions

View full text Add to dashboard Cite

In this paper, the numerical findings of a high fidelity CFD model will be compared with the experimental data of a test campaign devoted at characterizing the performance of a technically premixed industrial burner regarding the thermoacoustic instabilities. The data are retrieved at relevant gas turbine conditions in a test bench where the flame tube can change its length during the test execution allowing its fundamental acoustic frequencies to be modified and, in case, triggered. Mimicking the test configuration, several Large-Eddy Simulations are performed with different lengths of the flame tube in order to verify the ability of the numerical model to reproduce the excited dominant frequency and the corresponding limit cycle amplitude measurements. The numerical model demonstrates the ability to correctly reproduce the frequency triggered during the test and to reach different limit cycle amplitudes along different flame tube lengths in agreement with the tests, as well. However, it is found that the amplitude of the acoustic pressure fluctuation during the limit cycle is generally under-predicted. Despite this, the proposed approach demonstrates to be a robust tool for the characterization of a given design, allowing to dramatically reduce the computational cost of the analysis, at least in the early design phase. Since the numerical model can correctly reproduce the behavior of the investigated design, a deep post-processing of the solutions is performed to shed light on the physical mechanisms sustaining the thermo-acoustic instability. Among the numerical techniques employed at this purpose, the Phase-Locked Average and the Extended-POD are applied trying to correlate the fluctuations of the different quantities inside the premixed channel of the burner and the primary zone as well.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Characterization of the Self-Excited Dynamics Behavior of a Technically Premixed Burner

Meloni¹,

Gori²,

Riccio³

et al. 2022

Volume 3B: Combustion, Fuels, and Emissions

View full text Add to dashboard Cite

show abstract

Assessing accuracy, reliability, and efficiency of combustion models for prediction of flame dynamics with large eddy simulation

et al. 2022

View full text Add to dashboard Cite

A variety of combustion models for Large Eddy Simulation (LES) of premixed turbulent flames have been developed and validated over the years. Validation studies concentrate on relevant mean quantities and turbulent fluctuations, however the prediction of flame dynamics is typically not taken into account. Furthermore, it is difficult to meaningfully compare the computational efficiency of model formulations due to different compute resources, meshes, code bases and numerics. The present study compares turbulent combustion models on the same code base, keeping boundary conditions, meshes and numerical settings constant. The reliability and versatility of two turbulent combustion models, i.e. the artificially thickened flame and flame surface density formulations, is assessed by applying them to a variety of operating conditions and burner configurations. In particular, for a premixed methane burner we consider three power ratings by changing the inflow velocity, which increases the demand on the sub-grid scale model due to increased sub-grid scale wrinkling. A change in swirler position modifies the interference of swirl and acoustic perturbations, with a significant impact on flame dynamics. Changes in thermal boundary condition and combustion chamber size provide insights into the consequences of quenching effects resulting from heat losses on flame anchoring and flame topology.

show abstract

Prediction of Premixed Flame Dynamics Using Large Eddy Simulation With Tabulated Chemistry and Eulerian Stochastic Fields

Cited by 2 publications

References 39 publications

Experimental and Numerical Characterization of the Self-Excited Dynamics Behavior of a Technically Premixed Burner

Experimental and Numerical Characterization of the Self-Excited Dynamics Behavior of a Technically Premixed Burner

Assessing accuracy, reliability, and efficiency of combustion models for prediction of flame dynamics with large eddy simulation

Contact Info

Product

Resources

About