Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor

Oxygen-enriched combustion can improve thermal efficiency and reduce CO, unburned hydrocarbons and soot emissions in internal combustion engines. There are significant differences in the combustion process and pollutant emissions between oxygen-enriched and air condition. In order to develop an impr...

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Xuất bản năm:E3S Web of Conferences
Những tác giả chính: Wang Can, Zhong Xin, Liu Haifeng, Song Tengda, Wang Hu, Yang Bin, Yao Mingfa
Định dạng: Bài viết
Được phát hành: EDP Sciences 2022-01-01
Những chủ đề:
N-heptane
Kinetic
Oxygen enrichment
Jet-stirred reactor
Truy cập trực tuyến:https://www.e3s-conferences.org/articles/e3sconf/pdf/2022/27/e3sconf_vesep2022_01033.pdf
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spelling doaj-art-cf53c698bd764f959bdf9aca9a90fb402025-08-19T18:46:48ZengEDP SciencesE3S Web of Conferences2267-12422022-01-013600103310.1051/e3sconf/202236001033e3sconf_vesep2022_01033Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactorWang Can0Zhong Xin1Liu Haifeng2Song Tengda3Wang Hu4Yang Bin5Yao Mingfa6State Key Laboratory of Engines, Tianjin UniversityState Key Laboratory of Engines, Tianjin UniversityState Key Laboratory of Engines, Tianjin UniversityState Key Laboratory of Engines, Tianjin UniversityState Key Laboratory of Engines, Tianjin UniversityCenter for Combustion Energy and Key Laboratory for Thermal Science and Power Engineering of MOE, Tsinghua, UniversityState Key Laboratory of Engines, Tianjin UniversityOxygen-enriched combustion can improve thermal efficiency and reduce CO, unburned hydrocarbons and soot emissions in internal combustion engines. There are significant differences in the combustion process and pollutant emissions between oxygen-enriched and air condition. In order to develop an improved understanding of the effect of oxygen concentration on n-heptane oxidation, the jet-stirred reactor oxidation characteristics of n-heptane were experimentally tested at temperatures of 450-950 K and pressures of 1.03 atm with the residence time (τ) of 2 s, under the condition of oxygen mole fractions from 0.055 to 0.6. Meantime, the simulations were performed on CHEMKIN. Results show that, firstly, with the increase of oxygen concentration, the NTC (Negative Temperature Coefficient) effect is weakened, mainly due to the strengthening of low-temperature reaction path, which is also the reason for the improvement of ignition stability in cold-start condition of engines. Secondly, the activity of the reaction system improves with the increase of oxygen concentration. Within 500-750 K, it is due to enhancement of the low-temperature reaction path. When the temperature is higher than 750 K, the improvement is due to the enhancement of decomposition of H2O2 and addition reaction of H and O2. Thirdly, with the increase of oxygen concentration, both the generation and consumption of CO are strengthened, which leads to the tip of the diesel spray flame changing from soot area under air condition to the CO chemiluminescence.https://www.e3s-conferences.org/articles/e3sconf/pdf/2022/27/e3sconf_vesep2022_01033.pdfn-heptanekineticoxygen enrichmentjet-stirred reactor
institution Directory of Open Access Journals
collection DOAJ
format Article
author Wang Can
Zhong Xin
Liu Haifeng
Song Tengda
Wang Hu
Yang Bin
Yao Mingfa
spellingShingle Wang Can
Zhong Xin
Liu Haifeng
Song Tengda
Wang Hu
Yang Bin
Yao Mingfa
Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor
E3S Web of Conferences
10.1051/e3sconf/202236001033
N-heptane
Kinetic
Oxygen enrichment
Jet-stirred reactor
author_facet Wang Can
Zhong Xin
Liu Haifeng
Song Tengda
Wang Hu
Yang Bin
Yao Mingfa
author_sort Wang Can
title Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor
title_short Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor
title_full Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor
title_fullStr Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor
title_full_unstemmed Experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor
title_sort experimental and kinetic modeling studies on oxidation of n-heptane under oxygen enrichment in a jet-stirred reactor
publisher EDP Sciences
publisher_facet EDP Sciences
container_title E3S Web of Conferences
container_title_facet E3S Web of Conferences
issn 2267-1242
publishDate 2022-01-01
container_volume 360
container_startPage 01033
doi 10.1051/e3sconf/202236001033
description Oxygen-enriched combustion can improve thermal efficiency and reduce CO, unburned hydrocarbons and soot emissions in internal combustion engines. There are significant differences in the combustion process and pollutant emissions between oxygen-enriched and air condition. In order to develop an improved understanding of the effect of oxygen concentration on n-heptane oxidation, the jet-stirred reactor oxidation characteristics of n-heptane were experimentally tested at temperatures of 450-950 K and pressures of 1.03 atm with the residence time (τ) of 2 s, under the condition of oxygen mole fractions from 0.055 to 0.6. Meantime, the simulations were performed on CHEMKIN. Results show that, firstly, with the increase of oxygen concentration, the NTC (Negative Temperature Coefficient) effect is weakened, mainly due to the strengthening of low-temperature reaction path, which is also the reason for the improvement of ignition stability in cold-start condition of engines. Secondly, the activity of the reaction system improves with the increase of oxygen concentration. Within 500-750 K, it is due to enhancement of the low-temperature reaction path. When the temperature is higher than 750 K, the improvement is due to the enhancement of decomposition of H2O2 and addition reaction of H and O2. Thirdly, with the increase of oxygen concentration, both the generation and consumption of CO are strengthened, which leads to the tip of the diesel spray flame changing from soot area under air condition to the CO chemiluminescence.
topic N-heptane
Kinetic
Oxygen enrichment
Jet-stirred reactor
topic_facet N-heptane
Kinetic
Oxygen enrichment
Jet-stirred reactor
url https://www.e3s-conferences.org/articles/e3sconf/pdf/2022/27/e3sconf_vesep2022_01033.pdf
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first_indexed 2023-03-26T00:38:13Z
last_indexed 2025-09-27T09:46:01Z
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