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Non-reacting fuel spray simulations under direct diesel engine conditions

Municio Aranguez, Alejandro (2012)
Department of Energy Sciences
Abstract
Because of the increasing demand of low polluting and efficient diesel engines, numerous studies related to the different processes that take place in them are being carried out. This study treats the direct injection of fuel at high pressures (c.a. 1500 bar). Ignition is not simulated in this work since this is intended to be a previous step for future studies which include combustion. A combination of LES for turbulence modeling and LPT for liquid phase modeling, which is a rather new approach, has been used and its advantages and limitations are reviewed herein. Six different simulations with different conditions as: mesh resolution, number of injected parcels, droplet size distribution and initial turbulence field; have been performed,... (More)
Because of the increasing demand of low polluting and efficient diesel engines, numerous studies related to the different processes that take place in them are being carried out. This study treats the direct injection of fuel at high pressures (c.a. 1500 bar). Ignition is not simulated in this work since this is intended to be a previous step for future studies which include combustion. A combination of LES for turbulence modeling and LPT for liquid phase modeling, which is a rather new approach, has been used and its advantages and limitations are reviewed herein. Six different simulations with different conditions as: mesh resolution, number of injected parcels, droplet size distribution and initial turbulence field; have been performed, analyzed and compared to ECN Sandia Spray A experimental results. OpenFOAM, which is an open source flow solver, has been employed in this study. Vapor penetration results for the best case have a good agreement with experimental results, with a maximum relative error of 5.77%. However, liquid length predictions are highly inaccurate in every case, as a consequence of the usage of a droplet size distribution in the nozzle outlet instead of implementing an atomization model In diesel engines, a very accurate description of the liquid zone is not required, but a good description of the vapor distribution is preferred. This makes this work useful in this area. Furthermore, LES-LPT involves a low computational effort compared to Eulerian techniques, becoming it a feasible approach to be used along with reaction schemes. (Less)
Please use this url to cite or link to this publication:
author
Municio Aranguez, Alejandro
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
Diesel spray injections LES LPT
report number
5258
ISSN
0282-1990
language
English
id
3054883
date added to LUP
2012-09-20 14:47:25
date last changed
2012-09-20 14:47:25
@misc{3054883,
  abstract     = {Because of the increasing demand of low polluting and efficient diesel engines, numerous studies related to the different processes that take place in them are being carried out. This study treats the direct injection of fuel at high pressures (c.a. 1500 bar). Ignition is not simulated in this work since this is intended to be a previous step for future studies which include combustion. A combination of LES for turbulence modeling and LPT for liquid phase modeling, which is a rather new approach, has been used and its advantages and limitations are reviewed herein. Six different simulations with different conditions as: mesh resolution, number of injected parcels, droplet size distribution and initial turbulence field; have been performed, analyzed and compared to ECN Sandia Spray A experimental results. OpenFOAM, which is an open source flow solver, has been employed in this study. Vapor penetration results for the best case have a good agreement with experimental results, with a maximum relative error of 5.77%. However, liquid length predictions are highly inaccurate in every case, as a consequence of the usage of a droplet size distribution in the nozzle outlet instead of implementing an atomization model In diesel engines, a very accurate description of the liquid zone is not required, but a good description of the vapor distribution is preferred. This makes this work useful in this area. Furthermore, LES-LPT involves a low computational effort compared to Eulerian techniques, becoming it a feasible approach to be used along with reaction schemes.},
  author       = {Municio Aranguez, Alejandro},
  issn         = {0282-1990},
  keyword      = {Diesel spray injections LES LPT},
  language     = {eng},
  note         = {Student Paper},
  title        = {Non-reacting fuel spray simulations under direct diesel engine conditions},
  year         = {2012},
}