Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios.
Since the pressure development in a combustion chamber is uniquely related to the combustion process, substantial variations in the combustion process on a cycle-by-cycle basis are occurring. To this end, an experimental study of cycle-by-cycle variation in a direct injection spark ignition engine f...
| Main Authors: | Olalekan, W.S., Rashid, A.A., Baharom, M. |
|---|---|
| Format: | Conference or Workshop Item |
| Institution: | Universiti Teknologi Petronas |
| Record Id / ISBN-0: | utp-eprints.32254 / |
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EDP Sciences
2014
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904995783&doi=10.1051%2fmatecconf%2f20141302009&partnerID=40&md5=2f014e6e1e0ff0051020d8f2376a7717 http://eprints.utp.edu.my/32254/ |
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utp-eprints.322542022-03-29T05:02:24Z Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. Olalekan, W.S. Rashid, A.A. Baharom, M. Since the pressure development in a combustion chamber is uniquely related to the combustion process, substantial variations in the combustion process on a cycle-by-cycle basis are occurring. To this end, an experimental study of cycle-by-cycle variation in a direct injection spark ignition engine fueled with natural gas-hydrogen blends combined with exhaust gas recirculation at relative air-fuel ratios was conducted. The impacts of relative air-fuel ratios (i.e. λ = 1.0, 1.2, 1.3 and 1.4 which represent stoichiometric, moderately lean, lean and very lean mixtures respectively), hydrogen fractions and EGR rates were studied. The results showed that increasing the relative air-fuel ratio increases the COVIMEP. The behavior is more pronounced at the larger relative air-fuel ratios. More so, for a specified EGR rate; increasing the hydrogen fractions decreases the maximum COVIMEP value just as increasing in EGR rates increases the maximum COVIMEP value. (i.e. When percentage EGR rates is increased from 0 to 17 and 20 respectively. The maximum COVIMEP value increases from 6.25 to 6.56 and 8.30 respectively). Since the introduction of hydrogen gas reduces the cycle-by-cycle combustion variation in engine cylinder; thus it can be concluded that addition of hydrogen into direct injection compressed natural gas engine employing EGR at various relative air-fuel ratios is a viable approach to obtain an improved combustion quality which correspond to lower coefficient of variation in imep, (COVIMEP) in a direct injection compressed natural gas engine employing EGR at relative air-fuel ratios. © 2014 Owned by the authors, published by EDP Sciences. EDP Sciences 2014 Conference or Workshop Item NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904995783&doi=10.1051%2fmatecconf%2f20141302009&partnerID=40&md5=2f014e6e1e0ff0051020d8f2376a7717 Olalekan, W.S. and Rashid, A.A. and Baharom, M. (2014) Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. In: UNSPECIFIED. http://eprints.utp.edu.my/32254/ |
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Universiti Teknologi Petronas |
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UTP Institutional Repository |
| description |
Since the pressure development in a combustion chamber is uniquely related to the combustion process, substantial variations in the combustion process on a cycle-by-cycle basis are occurring. To this end, an experimental study of cycle-by-cycle variation in a direct injection spark ignition engine fueled with natural gas-hydrogen blends combined with exhaust gas recirculation at relative air-fuel ratios was conducted. The impacts of relative air-fuel ratios (i.e. λ = 1.0, 1.2, 1.3 and 1.4 which represent stoichiometric, moderately lean, lean and very lean mixtures respectively), hydrogen fractions and EGR rates were studied. The results showed that increasing the relative air-fuel ratio increases the COVIMEP. The behavior is more pronounced at the larger relative air-fuel ratios. More so, for a specified EGR rate; increasing the hydrogen fractions decreases the maximum COVIMEP value just as increasing in EGR rates increases the maximum COVIMEP value. (i.e. When percentage EGR rates is increased from 0 to 17 and 20 respectively. The maximum COVIMEP value increases from 6.25 to 6.56 and 8.30 respectively). Since the introduction of hydrogen gas reduces the cycle-by-cycle combustion variation in engine cylinder; thus it can be concluded that addition of hydrogen into direct injection compressed natural gas engine employing EGR at various relative air-fuel ratios is a viable approach to obtain an improved combustion quality which correspond to lower coefficient of variation in imep, (COVIMEP) in a direct injection compressed natural gas engine employing EGR at relative air-fuel ratios. © 2014 Owned by the authors, published by EDP Sciences. |
| format |
Conference or Workshop Item |
| author |
Olalekan, W.S. Rashid, A.A. Baharom, M. |
| spellingShingle |
Olalekan, W.S. Rashid, A.A. Baharom, M. Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. |
| author_sort |
Olalekan, W.S. |
| title |
Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. |
| title_short |
Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. |
| title_full |
Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. |
| title_fullStr |
Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. |
| title_full_unstemmed |
Cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing EGR at relative air-fuel ratios. |
| title_sort |
cycle-by-cycle variations in a direct injection hydrogen enriched compressed natural gas engine employing egr at relative air-fuel ratios. |
| publisher |
EDP Sciences |
| publishDate |
2014 |
| url |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904995783&doi=10.1051%2fmatecconf%2f20141302009&partnerID=40&md5=2f014e6e1e0ff0051020d8f2376a7717 http://eprints.utp.edu.my/32254/ |
| _version_ |
1741197707858411520 |
| score |
11.62408 |