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Numerical Modelling of Fuel Sprays

Bergström, Christer LU (1999)
Abstract
The way the fuel is introduced into the combustion chamber is one of the most important parameters for the power output and the generation of emissions in the combustion of liquid fuels. The interaction beween the turbulent gas flow field and the liquid fuel droplets, the vaporisation of them and the mixing of the gaseous fuel with the ambient air that are vital parameters in the combustion process. The use of numerical calculations is an important tool to better understand these complex interacting phenomena.



This thesis reports on the numerical modelling of fuel sprays in non-reacting cases using an own developed spray module. The spray module uses the stochastic parcel method to represent the spray. The module was... (More)
The way the fuel is introduced into the combustion chamber is one of the most important parameters for the power output and the generation of emissions in the combustion of liquid fuels. The interaction beween the turbulent gas flow field and the liquid fuel droplets, the vaporisation of them and the mixing of the gaseous fuel with the ambient air that are vital parameters in the combustion process. The use of numerical calculations is an important tool to better understand these complex interacting phenomena.



This thesis reports on the numerical modelling of fuel sprays in non-reacting cases using an own developed spray module. The spray module uses the stochastic parcel method to represent the spray. The module was made in such manner that it could by coupled with different gas flow solver. Results obtained from four different gas flow solver are presented in the thesis, including the use of two different kinds of turbulence models.



In the first part the spray module is coupled with a k-epsilon based 2-D cylindrical gas flow solver. A thorough sensitivity analysis was performed on the spray and gas flow solver parameters, such as grid size dependence and sensitivity to initial values of k-epsilon. The results of the spray module were also compared to results from other spray codes, e.g. the well known KIVA code.



In the second part of this thesis the spray was injected into a turbulent and fully developed crossflow studied. The spray module was attached to a LES (Large Eddy Simulation) based flow solvers enabling the study of the complex structures and time dependent phenomena involved in spray in crossflows. It was found that the spray performs an oscillatory motion and that the Strouhal number in the wake was about 0.1. Different spray breakup models were evaluated by comparing with experimental results. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Cavalliere, Antonio, Italien
organization
publishing date
type
Thesis
publication status
published
subject
keywords
vibration and acoustic engineering, vacuum technology, hydraulics, Mechanical engineering, Gas turbine., Temperature fluctuations. Diesel engine, Counter rotating Vortex Pair, CVP, Large Eddy Simulation, Droplet Evaporation, Turbulent flows, LES, Spray, Modelling, Break-up, Maskinteknik, hydraulik, vakuumteknik, vibrationer, akustik, Carbochemistry, petrochemistry, fuels and explosives technology, Petrokemi, bränslen, sprängämnen
pages
167 pages
publisher
LTH, Lund University
defense location
Room M:B, Ole Römers väg 1, Lund
defense date
1999-06-14 10:15
external identifiers
  • other:ISRN: LUTMDN/TMVK--1015--SE
ISSN
0282-1990
language
English
LU publication?
yes
id
f6d413c6-2d51-4461-b37b-0ffd0a209283 (old id 39772)
date added to LUP
2007-06-20 15:26:32
date last changed
2016-09-19 08:44:58
@phdthesis{f6d413c6-2d51-4461-b37b-0ffd0a209283,
  abstract     = {The way the fuel is introduced into the combustion chamber is one of the most important parameters for the power output and the generation of emissions in the combustion of liquid fuels. The interaction beween the turbulent gas flow field and the liquid fuel droplets, the vaporisation of them and the mixing of the gaseous fuel with the ambient air that are vital parameters in the combustion process. The use of numerical calculations is an important tool to better understand these complex interacting phenomena.<br/><br>
<br/><br>
This thesis reports on the numerical modelling of fuel sprays in non-reacting cases using an own developed spray module. The spray module uses the stochastic parcel method to represent the spray. The module was made in such manner that it could by coupled with different gas flow solver. Results obtained from four different gas flow solver are presented in the thesis, including the use of two different kinds of turbulence models.<br/><br>
<br/><br>
In the first part the spray module is coupled with a k-epsilon based 2-D cylindrical gas flow solver. A thorough sensitivity analysis was performed on the spray and gas flow solver parameters, such as grid size dependence and sensitivity to initial values of k-epsilon. The results of the spray module were also compared to results from other spray codes, e.g. the well known KIVA code.<br/><br>
<br/><br>
In the second part of this thesis the spray was injected into a turbulent and fully developed crossflow studied. The spray module was attached to a LES (Large Eddy Simulation) based flow solvers enabling the study of the complex structures and time dependent phenomena involved in spray in crossflows. It was found that the spray performs an oscillatory motion and that the Strouhal number in the wake was about 0.1. Different spray breakup models were evaluated by comparing with experimental results.},
  author       = {Bergström, Christer},
  issn         = {0282-1990},
  keyword      = {vibration and acoustic engineering,vacuum technology,hydraulics,Mechanical engineering,Gas turbine.,Temperature fluctuations. Diesel engine,Counter rotating Vortex Pair,CVP,Large Eddy Simulation,Droplet Evaporation,Turbulent flows,LES,Spray,Modelling,Break-up,Maskinteknik,hydraulik,vakuumteknik,vibrationer,akustik,Carbochemistry,petrochemistry,fuels and explosives technology,Petrokemi,bränslen,sprängämnen},
  language     = {eng},
  pages        = {167},
  publisher    = {LTH, Lund University},
  school       = {Lund University},
  title        = {Numerical Modelling of Fuel Sprays},
  year         = {1999},
}