Combustion characteristics of n-heptane spray combustion in a low temperature reform gas/air environment
(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.
(Less)
- author
- Zhong, Shenghui
LU
; Xu, Shijie
LU
; Bai, Xue Song LU ; Hadadpour, Ahmad LU ; Jangi, Mehdi LU ; Zhang, Fan LU ; Du, Qing and Peng, Zhijun
- organization
- publishing date
- 2021-06
- 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}}, }