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LES modeling of the DLR generic single-cup spray combustor : comparison of exploratory category C jet fuels

Åkerblom, Arvid LU and Fureby, Christer LU (2025) In Flow, Turbulence and Combustion 114. p.1315-1339
Abstract
The combustion of conventional Jet A, alongside two alternative jet fuels, C1 and C5, is simulated with Large Eddy Simulations (LES) in a generic single-cup spray combustor during idle and cruise conditions. The spray is modeled using Lagrangian particle tracking and the combustion chemistry of each fuel is modeled by skeletal reaction mechanisms. The volatility and atomizability of each fuel directly affect the spray penetration depth, with Jet A having the longest spray and C5 the shortest. All fuels have qualitatively similar flames at idle conditions, but the Jet A flame is relatively lifted at cruise conditions. C1 and C5 have similar flames despite different spray lengths, likely due to the rapid breakup of C1. The fuels produce... (More)
The combustion of conventional Jet A, alongside two alternative jet fuels, C1 and C5, is simulated with Large Eddy Simulations (LES) in a generic single-cup spray combustor during idle and cruise conditions. The spray is modeled using Lagrangian particle tracking and the combustion chemistry of each fuel is modeled by skeletal reaction mechanisms. The volatility and atomizability of each fuel directly affect the spray penetration depth, with Jet A having the longest spray and C5 the shortest. All fuels have qualitatively similar flames at idle conditions, but the Jet A flame is relatively lifted at cruise conditions. C1 and C5 have similar flames despite different spray lengths, likely due to the rapid breakup of C1. The fuels produce different emission profiles, which is connected to their respective H/C ratios, equivalence ratios, and aromatics contents. NOx emissions are particularly affected by the mixture fraction in the flame, resulting in high NOx emissions for the compact C1 and C5 flames. Thermoacoustic oscillations are observed in all simulations but are strongest for C1 and C5, which we hypothesize is a result of their high volatility. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Gas turbine combustor, Spray combustion, Large eddy simulation, Finite rate chemistry, Thermoacoustics
in
Flow, Turbulence and Combustion
volume
114
pages
25 pages
publisher
Springer
external identifiers
  • scopus:105003410262
ISSN
1386-6184
DOI
10.1007/s10494-025-00653-8
project
Large Eddy Simulations of Alternative Jet Fuel Combustion
language
English
LU publication?
yes
id
01a7286a-5295-4f4e-9da4-797486e3b79f
date added to LUP
2025-05-05 14:14:07
date last changed
2025-05-08 10:30:04
@article{01a7286a-5295-4f4e-9da4-797486e3b79f,
  abstract     = {{The combustion of conventional Jet A, alongside two alternative jet fuels, C1 and C5, is simulated with Large Eddy Simulations (LES) in a generic single-cup spray combustor during idle and cruise conditions. The spray is modeled using Lagrangian particle tracking and the combustion chemistry of each fuel is modeled by skeletal reaction mechanisms. The volatility and atomizability of each fuel directly affect the spray penetration depth, with Jet A having the longest spray and C5 the shortest. All fuels have qualitatively similar flames at idle conditions, but the Jet A flame is relatively lifted at cruise conditions. C1 and C5 have similar flames despite different spray lengths, likely due to the rapid breakup of C1. The fuels produce different emission profiles, which is connected to their respective H/C ratios, equivalence ratios, and aromatics contents. NOx emissions are particularly affected by the mixture fraction in the flame, resulting in high NOx emissions for the compact C1 and C5 flames. Thermoacoustic oscillations are observed in all simulations but are strongest for C1 and C5, which we hypothesize is a result of their high volatility.}},
  author       = {{Åkerblom, Arvid and Fureby, Christer}},
  issn         = {{1386-6184}},
  keywords     = {{Gas turbine combustor; Spray combustion; Large eddy simulation; Finite rate chemistry; Thermoacoustics}},
  language     = {{eng}},
  month        = {{04}},
  pages        = {{1315--1339}},
  publisher    = {{Springer}},
  series       = {{Flow, Turbulence and Combustion}},
  title        = {{LES modeling of the DLR generic single-cup spray combustor : comparison of exploratory category C jet fuels}},
  url          = {{http://dx.doi.org/10.1007/s10494-025-00653-8}},
  doi          = {{10.1007/s10494-025-00653-8}},
  volume       = {{114}},
  year         = {{2025}},
}