Background: Fuel economy and emission reductions became the most important issues in power-plants or energy conversion systems as the environmental regulations gets stricter together with green-house-gas (GHG) regulations while the drought of petroleum is coming soon. CO2 has been regarded as a main component among the GHGs. Some alternative fuels are spotlighted as new energy resources owing to advantages of environmentally-friendly operation as well as energy conservation.
In KAIST Engine Laboratory, the researches are focus on dimethyl-ether (DME) and liquefied petroleum gas (LPG).
Dimethyl-ether (DME) is considered one of the most promising alternative fuels for compression-ignition engines. DME is a gaseous fuel at standard temperature and pressure conditions, with markedly reduced emissions of particulate matter (PM) compared with standard diesel. Other reasons that account for the negligible emission of black smoke are the presence of oxygen and absence of carbon-to-carbon bonds in the fuel molecules. Small amounts of black smoke are oxidized during the expansion stroke based on the oxygen content.
Liquefied petroleum gas (LPG) , as an alternative fuel to the conventional ones, has been widely investigated to reduce the exhaust emission because it has lower carbon number and evaporates easily. Moreover, liquid phase LPG injection (LPLI) system has an advantage of enhancing power output because the volumetric efficiency increases due to lowered intake air temperature.
- Spray characteristics of liquid phase LPG injection
- Spark-ignition LPG engine combustion with liquid phase injection
- LPG HCCI combustion with DME as an Ignition Promoter
- DME Spray Characteristics in Common-Rail High Pressure Injection System
- High octane number fuel (gasoline, LPG, and synthetic gas) HCCI combustion with DME as an Ignition Promoter
- DME combustion characteristics in a direct injection compression ignition engine with common-rail injection system