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Large eddy simulation of combustion recession : Effects of ambient temperature and injection pressure

Zhang, Min ; Ong, Jiun Cai ; Pang, Kar Mun ; Xu, Shijie LU orcid ; Zhang, Yan LU ; Nemati, Arash ; Bai, Xue Song LU and Walther, Jens Honore (2023) In Fuel 351.
Abstract

In the present study, large eddy simulation is used to investigate combustion recession for the Engine Combustion Network Spray A flame at two ambient temperatures (850K and 800K) and two injection pressures (100MPa and 50MPa). The present numerical results are able to capture different combustion recession phenomena after the end-of-injection (AEOI). With an injection pressure of 100MPa, the model predicts a “separated” combustion recession at the ambient temperature of 850K and no combustion recession at the ambient temperature of 800K, in which both predictions correspond to the measurements. The combustion recession is mainly controlled by the auto-ignition process at the ambient temperature of 850K. At the ambient temperature of... (More)

In the present study, large eddy simulation is used to investigate combustion recession for the Engine Combustion Network Spray A flame at two ambient temperatures (850K and 800K) and two injection pressures (100MPa and 50MPa). The present numerical results are able to capture different combustion recession phenomena after the end-of-injection (AEOI). With an injection pressure of 100MPa, the model predicts a “separated” combustion recession at the ambient temperature of 850K and no combustion recession at the ambient temperature of 800K, in which both predictions correspond to the measurements. The combustion recession is mainly controlled by the auto-ignition process at the ambient temperature of 850K. At the ambient temperature of 800K, the local temperature within the fuel-rich region is not high enough to promote the high-temperature ignition process. As time progresses, the mixture within the fuel-rich region rapidly transitions to become an overly fuel-lean mixture, which further hinders high-temperature ignition to occur. Nonetheless, it is shown that lowering the injection pressure to 50MPa causes the combustion recession to occur at the ambient temperature of 800 K. This is likely attributed to the low injection case having a lower air entrainment rate AEOI, which causes the mixtures upstream of the lift-off position to transition slower from fuel-rich to fuel-lean mixtures.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ambient temperature, Combustion recession, End-of-injection, Flamelet Generated Manifold, Injection pressure
in
Fuel
volume
351
article number
128831
publisher
Elsevier
external identifiers
  • scopus:85162162849
ISSN
0016-2361
DOI
10.1016/j.fuel.2023.128831
language
English
LU publication?
yes
id
002167ff-fb5b-4cc3-9b41-cae56e072509
date added to LUP
2023-08-29 15:05:23
date last changed
2023-11-08 10:18:35
@article{002167ff-fb5b-4cc3-9b41-cae56e072509,
  abstract     = {{<p>In the present study, large eddy simulation is used to investigate combustion recession for the Engine Combustion Network Spray A flame at two ambient temperatures (850K and 800K) and two injection pressures (100MPa and 50MPa). The present numerical results are able to capture different combustion recession phenomena after the end-of-injection (AEOI). With an injection pressure of 100MPa, the model predicts a “separated” combustion recession at the ambient temperature of 850K and no combustion recession at the ambient temperature of 800K, in which both predictions correspond to the measurements. The combustion recession is mainly controlled by the auto-ignition process at the ambient temperature of 850K. At the ambient temperature of 800K, the local temperature within the fuel-rich region is not high enough to promote the high-temperature ignition process. As time progresses, the mixture within the fuel-rich region rapidly transitions to become an overly fuel-lean mixture, which further hinders high-temperature ignition to occur. Nonetheless, it is shown that lowering the injection pressure to 50MPa causes the combustion recession to occur at the ambient temperature of 800 K. This is likely attributed to the low injection case having a lower air entrainment rate AEOI, which causes the mixtures upstream of the lift-off position to transition slower from fuel-rich to fuel-lean mixtures.</p>}},
  author       = {{Zhang, Min and Ong, Jiun Cai and Pang, Kar Mun and Xu, Shijie and Zhang, Yan and Nemati, Arash and Bai, Xue Song and Walther, Jens Honore}},
  issn         = {{0016-2361}},
  keywords     = {{Ambient temperature; Combustion recession; End-of-injection; Flamelet Generated Manifold; Injection pressure}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Fuel}},
  title        = {{Large eddy simulation of combustion recession : Effects of ambient temperature and injection pressure}},
  url          = {{http://dx.doi.org/10.1016/j.fuel.2023.128831}},
  doi          = {{10.1016/j.fuel.2023.128831}},
  volume       = {{351}},
  year         = {{2023}},
}