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Computational sensitivity study of spray dispersion and mixing on the fuel properties in a gas turbine combustor

Grosshans, Holger LU ; Cao, Le; Fuchs, Laszlo LU and Szász, Robert Zoltán LU (2017) In Fluid Dynamics Research 49(2).
Abstract

A swirl stabilized gas turbine burner has been simulated in order to assess the effects of the fuel properties on spray dispersion and fuel-air mixing. The properties under consideration include fuel surface tension, viscosity and density. The turbulence of the gas phase is modeled applying the methodology of large eddy simulation whereas the dispersed liquid phase is described by Lagrangian particle tracking. The exchange of mass, momentum and energy between the two phases is accounted for by two-way coupling. Bag and stripping breakup regimes are considered for secondary droplet breakup, using the Reitz-Diwakar and the Taylor analogy breakup models. Moreover, a model for droplet evaporation is included. The results reveal a high... (More)

A swirl stabilized gas turbine burner has been simulated in order to assess the effects of the fuel properties on spray dispersion and fuel-air mixing. The properties under consideration include fuel surface tension, viscosity and density. The turbulence of the gas phase is modeled applying the methodology of large eddy simulation whereas the dispersed liquid phase is described by Lagrangian particle tracking. The exchange of mass, momentum and energy between the two phases is accounted for by two-way coupling. Bag and stripping breakup regimes are considered for secondary droplet breakup, using the Reitz-Diwakar and the Taylor analogy breakup models. Moreover, a model for droplet evaporation is included. The results reveal a high sensitivity of the spray structure to variations of all investigated parameters. In particular, a decrease in the surface tension or the fuel viscosity, or an increase in the fuel density, lead to less stable liquid structures. As a consequence, smaller droplets are generated and the overall spray surface area increases, leading to faster evaporation and mixing. Furthermore, with the trajectories of the small droplets being strongly influenced by aerodynamic forces (and less by their own inertia), the spray is more affected by the turbulent structures of the gaseous phase and the spray dispersion is enhanced.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Eulerian-Lagrangian, fuel spray, gas turbine burner, large eddy simulation
in
Fluid Dynamics Research
volume
49
issue
2
publisher
Elsevier
external identifiers
  • scopus:85015750535
  • wos:000399539400002
ISSN
0169-5983
DOI
10.1088/1873-7005/49/2/025506
language
English
LU publication?
yes
id
e442497e-5b3f-46a6-93e3-7236f7bce504
date added to LUP
2017-04-06 08:20:10
date last changed
2018-01-07 11:58:11
@article{e442497e-5b3f-46a6-93e3-7236f7bce504,
  abstract     = {<p>A swirl stabilized gas turbine burner has been simulated in order to assess the effects of the fuel properties on spray dispersion and fuel-air mixing. The properties under consideration include fuel surface tension, viscosity and density. The turbulence of the gas phase is modeled applying the methodology of large eddy simulation whereas the dispersed liquid phase is described by Lagrangian particle tracking. The exchange of mass, momentum and energy between the two phases is accounted for by two-way coupling. Bag and stripping breakup regimes are considered for secondary droplet breakup, using the Reitz-Diwakar and the Taylor analogy breakup models. Moreover, a model for droplet evaporation is included. The results reveal a high sensitivity of the spray structure to variations of all investigated parameters. In particular, a decrease in the surface tension or the fuel viscosity, or an increase in the fuel density, lead to less stable liquid structures. As a consequence, smaller droplets are generated and the overall spray surface area increases, leading to faster evaporation and mixing. Furthermore, with the trajectories of the small droplets being strongly influenced by aerodynamic forces (and less by their own inertia), the spray is more affected by the turbulent structures of the gaseous phase and the spray dispersion is enhanced.</p>},
  articleno    = {025506},
  author       = {Grosshans, Holger and Cao, Le and Fuchs, Laszlo and Szász, Robert Zoltán},
  issn         = {0169-5983},
  keyword      = {Eulerian-Lagrangian,fuel spray,gas turbine burner,large eddy simulation},
  language     = {eng},
  month        = {02},
  number       = {2},
  publisher    = {Elsevier},
  series       = {Fluid Dynamics Research},
  title        = {Computational sensitivity study of spray dispersion and mixing on the fuel properties in a gas turbine combustor},
  url          = {http://dx.doi.org/10.1088/1873-7005/49/2/025506},
  volume       = {49},
  year         = {2017},
}