Abstract
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.
Highlights
Since the fossil fuel resources are finite and the effect of greenhouse issue, Internal CombustionEngines (ICEs) having high thermal efficiency and lower exhaust gas emission have been always at the point of interest for IEC’s research and development scientists [1,2,3]
It has been found that depending on the engine speed, load and level chemical reactions which will lead to the start of combustion of homogeneously mixed fuel and air of Exhaust Gas Recirculation (EGR), it is possible to increase the Tepc in a two-stroke engine due to the mixtures [31,32,33,34,35]
A T-joint connection of 25 mm diameter is fitted immediately after the In-EGR to induce a faction of the exhaust gases from the exhaust pipe into the intake runner
Summary
Since the fossil fuel resources are finite and the effect of greenhouse issue, Internal Combustion. It has been found that depending on the engine speed, load and level chemical reactions which will lead to the start of combustion of homogeneously mixed fuel and air of Exhaust Gas Recirculation (EGR), it is possible to increase the Tepc in a two-stroke engine due to the mixtures [31,32,33,34,35] These requirements can be realized by recycling or trapping the burned gases within mixing of unburned gas introduced into the cylinder and hot residual gas (burned gas) [26,27,28,29,30]. Dilution Effect-lower air/oxygen concentration due to substitution of inert gases existed in the hot gases
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