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Effects of Nozzle Diameter on Diesel Spray Flames : A numerical study using an Eulerian Stochastic Field Method

Pang, Kar Mun; Jangi, Mehdi LU ; Bai, Xue Song LU ; Schramm, Jesper and Walther, Jens Honore (2017) In Energy Procedia 142. p.1028-1033
Abstract

The present numerical study aims to assess the performance of an Eulerian Stochastic Field (ESF) model in simulating spray flames produced by three fuel injectors with different nozzle diameters of 100 μm, 180 μm and 363 μm. A comparison to the measurements shows that although the simulated ignition delay times are consistently overestimated, the relative differences remain below 28%. Furthermore, the change of the averaged pressure rise with respect to the variation of nozzle diameter is captured by the model. The simulated flame lift-off lengths also agree with the measurements, with a maximum relative difference of 13%. The spray flame produced by a larger nozzle diameter has a fuel-richer premixed core region despite the longer... (More)

The present numerical study aims to assess the performance of an Eulerian Stochastic Field (ESF) model in simulating spray flames produced by three fuel injectors with different nozzle diameters of 100 μm, 180 μm and 363 μm. A comparison to the measurements shows that although the simulated ignition delay times are consistently overestimated, the relative differences remain below 28%. Furthermore, the change of the averaged pressure rise with respect to the variation of nozzle diameter is captured by the model. The simulated flame lift-off lengths also agree with the measurements, with a maximum relative difference of 13%. The spray flame produced by a larger nozzle diameter has a fuel-richer premixed core region despite the longer lift-of length, indicating that the higher fueling rate used with the larger nozzle diameter is a more dominating factor than the lift-off length is in influencing the air entrainment into the upstream of the spray flames. In addition, the simulated normalised flame lengths are found to decrease when the nozzle diameters increase. These predictions are in good qualitative agreement with the experimental observation. This work proves that the ESF model can serve as an important tool for the simulation of spray flames in marine diesel engines, where fuel injectors with different nozzle diameters are applied for pilot and main injections.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
diesel spray flame, Eulerian Stochastic Fields, flame length, nozzle hole diameter, turbulent combustion
in
Energy Procedia
volume
142
pages
6 pages
publisher
Elsevier
external identifiers
  • scopus:85041534807
ISSN
1876-6102
DOI
10.1016/j.egypro.2017.12.350
language
English
LU publication?
yes
id
e6b26769-7353-4683-a356-99fd4e384adb
date added to LUP
2018-02-22 13:17:21
date last changed
2019-10-23 05:44:03
@article{e6b26769-7353-4683-a356-99fd4e384adb,
  abstract     = {<p>The present numerical study aims to assess the performance of an Eulerian Stochastic Field (ESF) model in simulating spray flames produced by three fuel injectors with different nozzle diameters of 100 μm, 180 μm and 363 μm. A comparison to the measurements shows that although the simulated ignition delay times are consistently overestimated, the relative differences remain below 28%. Furthermore, the change of the averaged pressure rise with respect to the variation of nozzle diameter is captured by the model. The simulated flame lift-off lengths also agree with the measurements, with a maximum relative difference of 13%. The spray flame produced by a larger nozzle diameter has a fuel-richer premixed core region despite the longer lift-of length, indicating that the higher fueling rate used with the larger nozzle diameter is a more dominating factor than the lift-off length is in influencing the air entrainment into the upstream of the spray flames. In addition, the simulated normalised flame lengths are found to decrease when the nozzle diameters increase. These predictions are in good qualitative agreement with the experimental observation. This work proves that the ESF model can serve as an important tool for the simulation of spray flames in marine diesel engines, where fuel injectors with different nozzle diameters are applied for pilot and main injections.</p>},
  author       = {Pang, Kar Mun and Jangi, Mehdi and Bai, Xue Song and Schramm, Jesper and Walther, Jens Honore},
  issn         = {1876-6102},
  keyword      = {diesel spray flame,Eulerian Stochastic Fields,flame length,nozzle hole diameter,turbulent combustion},
  language     = {eng},
  pages        = {1028--1033},
  publisher    = {Elsevier},
  series       = {Energy Procedia},
  title        = {Effects of Nozzle Diameter on Diesel Spray Flames : A numerical study using an Eulerian Stochastic Field Method},
  url          = {http://dx.doi.org/10.1016/j.egypro.2017.12.350},
  volume       = {142},
  year         = {2017},
}