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Combustion characteristics of n-heptane spray combustion in a low temperature reform gas/air environment

Zhong, Shenghui LU ; Xu, Shijie LU orcid ; Bai, Xue Song LU ; Hadadpour, Ahmad LU ; Jangi, Mehdi LU ; Zhang, Fan LU ; Du, Qing and Peng, Zhijun (2021) In Fuel 293.
Abstract

This paper presents a large eddy simulation study of n-heptane spray combustion in an n-heptane low temperature reform (LTR) gas environment in a constant volume combustion chamber, under conditions relevant to single-fuel reactivity controlled compression ignition (RCCI) combustion engines. The LTR gas is made up of partially oxidized intermediate species from rich n-heptane/air mixture in an external constant temperature reformer. It is found that a higher reform temperature results in a longer ignition delay time of the n-heptane spray and a higher liftoff length, due to the chemical effect of the LTR gas and the difference in the reaction zone structures. A significantly different spray flame structure is identified in the RCCI case... (More)

This paper presents a large eddy simulation study of n-heptane spray combustion in an n-heptane low temperature reform (LTR) gas environment in a constant volume combustion chamber, under conditions relevant to single-fuel reactivity controlled compression ignition (RCCI) combustion engines. The LTR gas is made up of partially oxidized intermediate species from rich n-heptane/air mixture in an external constant temperature reformer. It is found that a higher reform temperature results in a longer ignition delay time of the n-heptane spray and a higher liftoff length, due to the chemical effect of the LTR gas and the difference in the reaction zone structures. A significantly different spray flame structure is identified in the RCCI case from that of single-fuel spray combustion. After the onset of high temperature ignition, a double-layer flame structure is established in the RCCI case, with a diffusion flame layer and a lean premixed flame layer. The lean premixed flame affects the flow field, which significantly suppresses the mixing around the spray tip. As a result, the RCCI case exhibits a lower NOx formation but a higher soot formation than the single-fuel case.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Dual fuel, Engine Combustion network, Eulerian stochastic fields, Fuel reform, Spray combustion
in
Fuel
volume
293
article number
120377
publisher
Elsevier
external identifiers
  • scopus:85101551230
ISSN
0016-2361
DOI
10.1016/j.fuel.2021.120377
language
English
LU publication?
yes
id
135748ed-52f6-43fa-8861-7dfbcf9704f1
date added to LUP
2021-12-28 13:29:02
date last changed
2022-04-27 07:00:46
@article{135748ed-52f6-43fa-8861-7dfbcf9704f1,
  abstract     = {{<p>This paper presents a large eddy simulation study of n-heptane spray combustion in an n-heptane low temperature reform (LTR) gas environment in a constant volume combustion chamber, under conditions relevant to single-fuel reactivity controlled compression ignition (RCCI) combustion engines. The LTR gas is made up of partially oxidized intermediate species from rich n-heptane/air mixture in an external constant temperature reformer. It is found that a higher reform temperature results in a longer ignition delay time of the n-heptane spray and a higher liftoff length, due to the chemical effect of the LTR gas and the difference in the reaction zone structures. A significantly different spray flame structure is identified in the RCCI case from that of single-fuel spray combustion. After the onset of high temperature ignition, a double-layer flame structure is established in the RCCI case, with a diffusion flame layer and a lean premixed flame layer. The lean premixed flame affects the flow field, which significantly suppresses the mixing around the spray tip. As a result, the RCCI case exhibits a lower NOx formation but a higher soot formation than the single-fuel case.</p>}},
  author       = {{Zhong, Shenghui and Xu, Shijie and Bai, Xue Song and Hadadpour, Ahmad and Jangi, Mehdi and Zhang, Fan and Du, Qing and Peng, Zhijun}},
  issn         = {{0016-2361}},
  keywords     = {{Dual fuel; Engine Combustion network; Eulerian stochastic fields; Fuel reform; Spray combustion}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Fuel}},
  title        = {{Combustion characteristics of n-heptane spray combustion in a low temperature reform gas/air environment}},
  url          = {{http://dx.doi.org/10.1016/j.fuel.2021.120377}},
  doi          = {{10.1016/j.fuel.2021.120377}},
  volume       = {{293}},
  year         = {{2021}},
}