Combustion and Emission Enhancement of a Spark Ignition Two-Stroke Cycle Engine Utilizing Internal and External Exhaust Gas Recirculation Approach at Low-Load Operation

Two-stroke cycle engines have always been prominent due to their distinctive advantage incorporating high power-to-weight ratio, however the drawbacks are poor combustion efficiency, fuel short-circuiting and excessive emission of uHC and CO. These problems are apparent at low-load and speed regions...

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Bibliographic Details
Published in:Energies (Basel) 2019-02, Vol.12 (4), p.609
Main Authors: Amin Mahmoudzadeh Andwari, Pesyridis, Apostolos, Esfahanian, Vahid, Mohd Farid Muhamad Said
Format: Article
Language:English
Subjects:
Carbon dioxide
Civil engineering
Combustion
Combustion chambers
Combustion efficiency
Combustion stability
Compression
Cyclic Variation
Cylinders
Empirical equations
Engines
Exhaust Emissions
Exhaust gases
External EGR
Gases
Heat
High temperature effects
Internal EGR
Mechanical engineering
Misfire
R&D
Research & development
Residual gas
Spark ignition
Spark plugs
Temperature
Trucking industry
Two-Stroke Cycle Engine
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Summary:Two-stroke cycle engines have always been prominent due to their distinctive advantage incorporating high power-to-weight ratio, however the drawbacks are poor combustion efficiency, fuel short-circuiting and excessive emission of uHC and CO. These problems are apparent at low-load and speed regions and are the major obstacle to their global acceptance. The deficiencies can be addressed by increasing the in-cylinder average charge temperature employing Exhaust Gas Recirculation (EGR). An experimental study is conducted to investigate the influence of utilizing EGR techniques, including Internal and External EGR, on combustion misfiring occurrence, combustion stability and exhaust emissions using a single cylinder two-stroke SI engine at idling, low and mid-load conditions. From the results, it is observed since the average in-cylinder charge temperature is increased, due to utilizing EGRs, engine’s low and mid-load irregular combustions (misfire) and exhaust emissions are remarkably supressed and almost all of misfire cycles eliminated depending on the percentage of EGRs. In terms of combustion stability, it is agreed in general the application of EGRs improves the cyclic variation of IMEP, Pmax and CA10 compared to conventional operation. However, applying Ex-EGR compared to In-EGR will deteriorate cyclic variability of IMEP and CA10.
ISSN:1996-1073
1996-1073
DOI:10.3390/en12040609