Effect of internal and external EGR on cyclic variability and emissions of a spark ignition two-stroke cycle gasoline engine

Amin Mahmoudzadeh Andwari; Azhar Abdul Aziz; Mohd Farid Muhamad Said; Vahid Esfahanian; Zulkarnain  Abdul Latiff; Sharil Nizam Mohamad Said

doi:10.15282/jmes.11.4.2017.4.0270

Authors

Amin Mahmoudzadeh Andwari Vehicle, Fuel and Environment Research Institute, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 1439956191, Iran
Azhar Abdul Aziz Automotive Development Center (ADC), Faculty of Mechanical Engineering Universiti Teknologi Malaysia (UTM), 81310 Johor Bahru, Malaysia
Mohd Farid Muhamad Said Automotive Development Center (ADC), Faculty of Mechanical Engineering Universiti Teknologi Malaysia (UTM), 81310 Johor Bahru, Malaysia
Vahid Esfahanian Vehicle, Fuel and Environment Research Institute, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 1439956191, Iran
Zulkarnain Abdul Latiff Automotive Development Center (ADC), Faculty of Mechanical Engineering Universiti Teknologi Malaysia (UTM), 81310 Johor Bahru, Malaysia
Sharil Nizam Mohamad Said Mechanical Section, UniKL, Malaysia Spanish Institute, Kulim, 09000, Kedah, Malaysia

DOI:

https://doi.org/10.15282/jmes.11.4.2017.4.0270

Keywords:

Two-Stroke cycle engine; Internal EGR; External EGR; Cyclic Variability; Exhaust gas emissions.

Abstract

Conventional two-stroke cycle engine suffers from typical drawbacks including lower combustion efficiency and excessive emissions of uHC and CO which are largely due to low in-cylinder average charge temperature at low load and speed regions of engine operating conditions. Utilising the hot burned Exhaust Gas Recirculation (EGR) technique can boost the in-cylinder average charge temperature of the engine. The influence of hot burned gases applied by means of both Internal EGR and External EGR strategies on the combustion stability and exhaust gas emission of a single-cylinder twostroke cycle engine running at low-load and mid-load of operating conditions was investigated experimentally along with simulation works using 1-D engine simulation code. The results indicated that both In-EGR and Ex-EGR improved the combustion stability (lower misfire cycle) and decreased the concentrations of uHC and CO emissions, specifically at low speed region; however, NOx concentration was increased. At Internal EGR setting of 30%, the Coefficient of Variation for maximum in-cylinder pressure (COV_Pmax) reached the minimum by 5.64 while when External EGR percentage was 25%, COV_Pmax approached about 6.67 at the mid-speed (2000 rpm) of engine operating condition.

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