Sjerić, Momir and Taritaš, Ivan and Tomić, Rudolf and Blažić, Mislav and Kozarac, Darko and Lulić, Zoran (2016) Efficiency improvement of a spark-ignition engine at full load conditions using exhaust gas recirculation and variable geometry turbocharger - Numerical study. = Efficiency improvement of a spark-ignition engine at full load conditions using exhaust gas recirculation and variable geometry turbocharger - Numerical study. Energy conversion and management, 125. pp. 26-39. ISSN 0196-8904. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2016). Točan broj autora: 6.
Full text not available from this repository.Abstract
The numerical analysis of performance of a four cylinder highly boosted spark-ignition engine at full load is described in this paper, with the research focused on introducing high pressure exhaust gas recirculation for control of engine limiting factors such as knock, turbine inlet temperature and cyclic variability. For this analysis the cycle- simulation model which includes modeling of the entire engine flow path, early flame kernel growth, mixture stratification, turbulent combustion, in-cylinder turbulence, knock and cyclic variability was applied. The cylinder sub-models such as ignition, turbulence and combustion were validated by using the experimental results of a naturally aspirated multi cylinder spark-ignition engine. The high load operation, which served as a benchmark value, was obtained by a standard procedure used in calibration of engines, i.e. operation with fuel enrichment and without exhaust gas recirculation. By introducing exhaust gas recirculation and by optimizing other engine operating parameters, the influence of exhaust gas recirculation on engine performance is obtained. The optimum operating parameters, such as spark advance, intake pressure, air to fuel ratio, were found to meet the imposed requirements in terms of fuel consumption, knock occurrence, exhaust gas temperature and variation of indicated mean effective pressure. By comparing the results of the base point with the results that used exhaust gas recirculation the improvement in fuel consumption of 8.7%, 11.2% and 1.5% at engine speeds of 2000 rpm, 3500 rpm and 5000 rpm is obtained. Additionally, by using the presented numerical methodology the influence of the specific operating parameter on the overall behavior of the complex charging system was shown.
| Item Type: | Article (["eprint_fieldopt_article_type_article" not defined]) |
|---|---|
| Keywords (Croatian): | spark-ignition, knock, EGR, turbocharging, cyclic variability, fuel consumption |
| Subjects: | TECHNICAL SCIENCE > Mechanical Engineering |
| Divisions: | 400 Department of IC Engines and Mechanical Handling Equipment > 410 Chair of IC Engines and Motor Vehicles |
| Indexed in Web of Science: | Yes |
| Indexed in Current Contents: | Yes |
| Citations JCR: | 5 (19.03.2018.) |
| Quartiles: | Q1 (2016) |
| Citations SCOPUS: | 5 (19.03.2018.) |
| Date Deposited: | 20 Apr 2016 10:12 |
| Last Modified: | 19 Mar 2018 10:01 |
| URI: | http://repozitorij.fsb.hr/id/eprint/5694 |
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