Direct numerical simulation of PRF70/air partially premixed combustion under IC engine conditions
(2015) In Proceedings of the Combustion Institute 35. p.2975-2982- Abstract
- A three-dimensional direct numerical simulation (DNS) is performed to study the ignition and the combustion process of a primary reference fuel (PRF) under conditions relevant to partially premixed combustion (PPC) engines. Detailed transport properties together with a skeletal PRF chemical kinetic mechanism are employed in the simulations. The initial partially premixed charge is prescribed according to a two-injection of fuel strategy with a 50% exhaust gas recirculation (EGR). The motion of the piston, hence, the effect of compression of the charge due to the piston motion is considered. The simulations are performed with a fine mesh with a spatial resolution of 1.2 micrometers in a cubic domain of 614 micrometers on each side. The... (More)
- A three-dimensional direct numerical simulation (DNS) is performed to study the ignition and the combustion process of a primary reference fuel (PRF) under conditions relevant to partially premixed combustion (PPC) engines. Detailed transport properties together with a skeletal PRF chemical kinetic mechanism are employed in the simulations. The initial partially premixed charge is prescribed according to a two-injection of fuel strategy with a 50% exhaust gas recirculation (EGR). The motion of the piston, hence, the effect of compression of the charge due to the piston motion is considered. The simulations are performed with a fine mesh with a spatial resolution of 1.2 micrometers in a cubic domain of 614 micrometers on each side. The results show that there are three distinctive combustion regions in a domain under PPC conditions, a lean homogeneous mixture region, a fuel-rich region, and in between a region with stoichiometric mixture. Auto-ignition occurs first in the lean and stoichiometric mixture regions, followed by a partially premixed flame in the fuel-rich region and at last a CO oxidation phase in the fuel-rich region. In the lean mixture region, the fuel and the combustion intermediates such as CO are consumed almost completely due to the relatively fast combustion and the abundant oxygen. The CO formed in the regions with the stoichiometric and the fuel-rich mixture is consumed in a mixing controlled mode, which requires a high-level turbulence mixing or a sufficiently long residence time. NO is formed mainly due to the premixed combustion in the region with the stoichiometric mixture. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4022791
- author
- Zhang, Fan LU ; Yu, Rixin LU and Bai, Xue-Song LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Direct numerical simulation, Partially premixed combustion, PRF fuel, IC engines
- in
- Proceedings of the Combustion Institute
- volume
- 35
- pages
- 2975 - 2982
- publisher
- Elsevier
- external identifiers
-
- wos:000348049500057
- scopus:84947543729
- ISSN
- 1540-7489
- DOI
- 10.1016/j.proci.2014.09.004
- language
- English
- LU publication?
- yes
- id
- 965adee0-063c-4ab6-9373-930e629850a5 (old id 4022791)
- date added to LUP
- 2016-04-01 11:10:15
- date last changed
- 2022-01-26 05:56:06
@article{965adee0-063c-4ab6-9373-930e629850a5,
abstract = {{A three-dimensional direct numerical simulation (DNS) is performed to study the ignition and the combustion process of a primary reference fuel (PRF) under conditions relevant to partially premixed combustion (PPC) engines. Detailed transport properties together with a skeletal PRF chemical kinetic mechanism are employed in the simulations. The initial partially premixed charge is prescribed according to a two-injection of fuel strategy with a 50% exhaust gas recirculation (EGR). The motion of the piston, hence, the effect of compression of the charge due to the piston motion is considered. The simulations are performed with a fine mesh with a spatial resolution of 1.2 micrometers in a cubic domain of 614 micrometers on each side. The results show that there are three distinctive combustion regions in a domain under PPC conditions, a lean homogeneous mixture region, a fuel-rich region, and in between a region with stoichiometric mixture. Auto-ignition occurs first in the lean and stoichiometric mixture regions, followed by a partially premixed flame in the fuel-rich region and at last a CO oxidation phase in the fuel-rich region. In the lean mixture region, the fuel and the combustion intermediates such as CO are consumed almost completely due to the relatively fast combustion and the abundant oxygen. The CO formed in the regions with the stoichiometric and the fuel-rich mixture is consumed in a mixing controlled mode, which requires a high-level turbulence mixing or a sufficiently long residence time. NO is formed mainly due to the premixed combustion in the region with the stoichiometric mixture.}},
author = {{Zhang, Fan and Yu, Rixin and Bai, Xue-Song}},
issn = {{1540-7489}},
keywords = {{Direct numerical simulation; Partially premixed combustion; PRF fuel; IC engines}},
language = {{eng}},
pages = {{2975--2982}},
publisher = {{Elsevier}},
series = {{Proceedings of the Combustion Institute}},
title = {{Direct numerical simulation of PRF70/air partially premixed combustion under IC engine conditions}},
url = {{http://dx.doi.org/10.1016/j.proci.2014.09.004}},
doi = {{10.1016/j.proci.2014.09.004}},
volume = {{35}},
year = {{2015}},
}