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LES Modeling of the DLR Generic Single-Cup Spray Combustor : Validation and the Impact of Combustion Chemistry

Åkerblom, Arvid LU and Fureby, Christer LU (2023) In Flow, Turbulence and Combustion
Abstract

Turbulent spray combustion in a generic kerosene-fueled single-cup combustor at typical idle and cruise conditions of an aeroengine are studied with Large Eddy Simulations (LES) using Lagrangian spray and finite-rate chemistry combustion modeling. Three reaction mechanisms of varying complexity are used to model the combustion chemistry. The choice of turbulence-chemistry interaction model is shown to affect the results significantly. The impact of the choice of chemical reaction mechanism and the difference in operating conditions are gauged in terms of time-averaged flow, spray, and combustion characteristics as well as unsteady behavior. Good agreement between LES predictions and experimental results are generally observed but with a... (More)

Turbulent spray combustion in a generic kerosene-fueled single-cup combustor at typical idle and cruise conditions of an aeroengine are studied with Large Eddy Simulations (LES) using Lagrangian spray and finite-rate chemistry combustion modeling. Three reaction mechanisms of varying complexity are used to model the combustion chemistry. The choice of turbulence-chemistry interaction model is shown to affect the results significantly. The impact of the choice of chemical reaction mechanism and the difference in operating conditions are gauged in terms of time-averaged flow, spray, and combustion characteristics as well as unsteady behavior. Good agreement between LES predictions and experimental results are generally observed but with a notable dependence on the choice of chemical reaction mechanism. The mechanism specifically targeting Jet A displays the best agreement. The choice of reaction mechanism is further demonstrated to influence the flow and thermoacoustics in the combustor, resulting in different thermoacoustic modes dominating. The spray cone is found to be too narrow and thin, an inaccuracy which could be remedied by either making the injection method more empirical or by introducing additional models.

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Contribution to journal
publication status
epub
subject
keywords
Finite rate chemistry, Gas turbine combustor, Large eddy simulation, Spray combustion, Thermoacoustics
in
Flow, Turbulence and Combustion
publisher
Springer
external identifiers
  • scopus:85179338947
ISSN
1386-6184
DOI
10.1007/s10494-023-00512-4
language
English
LU publication?
yes
id
f845ee25-eca3-4727-bd2b-38434490c76f
date added to LUP
2024-01-11 12:20:30
date last changed
2024-01-11 12:22:24
@article{f845ee25-eca3-4727-bd2b-38434490c76f,
  abstract     = {{<p>Turbulent spray combustion in a generic kerosene-fueled single-cup combustor at typical idle and cruise conditions of an aeroengine are studied with Large Eddy Simulations (LES) using Lagrangian spray and finite-rate chemistry combustion modeling. Three reaction mechanisms of varying complexity are used to model the combustion chemistry. The choice of turbulence-chemistry interaction model is shown to affect the results significantly. The impact of the choice of chemical reaction mechanism and the difference in operating conditions are gauged in terms of time-averaged flow, spray, and combustion characteristics as well as unsteady behavior. Good agreement between LES predictions and experimental results are generally observed but with a notable dependence on the choice of chemical reaction mechanism. The mechanism specifically targeting Jet A displays the best agreement. The choice of reaction mechanism is further demonstrated to influence the flow and thermoacoustics in the combustor, resulting in different thermoacoustic modes dominating. The spray cone is found to be too narrow and thin, an inaccuracy which could be remedied by either making the injection method more empirical or by introducing additional models.</p>}},
  author       = {{Åkerblom, Arvid and Fureby, Christer}},
  issn         = {{1386-6184}},
  keywords     = {{Finite rate chemistry; Gas turbine combustor; Large eddy simulation; Spray combustion; Thermoacoustics}},
  language     = {{eng}},
  publisher    = {{Springer}},
  series       = {{Flow, Turbulence and Combustion}},
  title        = {{LES Modeling of the DLR Generic Single-Cup Spray Combustor : Validation and the Impact of Combustion Chemistry}},
  url          = {{http://dx.doi.org/10.1007/s10494-023-00512-4}},
  doi          = {{10.1007/s10494-023-00512-4}},
  year         = {{2023}},
}