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contributor authorDésor, Marcel
contributor authorHaeringer, Matthias
contributor authorHiestermann, Marian
contributor authorNiebler, Korbinian
contributor authorSilva, Camilo F.
contributor authorPolifke, Wolfgang
date accessioned2025-04-21T10:29:49Z
date available2025-04-21T10:29:49Z
date copyright10/3/2024 12:00:00 AM
date issued2024
identifier issn0742-4795
identifier othergtp_147_03_031003.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4306315
description abstractThe estimation of flame transfer functions (FTF) from time series data generated by large eddy simulation (LES) via system identification (SI) is an important element of thermoacoustic analysis. A continuous time series of adequate length is required to achieve low uncertainty, especially when dealing with turbulent noise. Limited scalability of LES codes implies that the wall-clock-time required for generating such time series may be excessive. The present paper tackles this challenge by exploring how the superposition of multiple simulations with the same excitation signal, but varying initial conditions, increases signal-to-noise ratio (SNR) and leads to more robust identification. In addition, the established SI approach, which relies on broadband excitation, is compared to excitation with approximate Dirac and Heaviside signals, promising simpler pre- and postprocessing. Results demonstrate that the proposed workflow reduces significantly the wall-clock-time required for robust FTF identification. This reduction in wall-clock-time requires more parallel computational resources, but it does not significantly increase the overall computational cost while also enabling FTF estimation using Heaviside excitation. The proposed method is assessed on a partially premixed, steam enriched water-enhanced turbofan (“WET”) swirl burner with significant turbulent noise levels. Steam enrichment is a combustion concept that reduces harmful emissions such as NOx and CO2 while increasing engine efficiency. However, the effect of steam on the flame response needs to be better understood. To this end, a combustion model including an optimized global chemical mechanism for partially premixed wet methane combustion is presented and validated against experimental data.
publisherThe American Society of Mechanical Engineers (ASME)
titleApplication of an Improved Workflow for the Identification of Flame Dynamics to Swirl-Stabilized Wet Combustion
typeJournal Paper
journal volume147
journal issue3
journal titleJournal of Engineering for Gas Turbines and Power
identifier doi10.1115/1.4066364
journal fristpage31003-1
journal lastpage31003-11
page11
treeJournal of Engineering for Gas Turbines and Power:;2024:;volume( 147 ):;issue: 003
contenttypeFulltext


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