F2008-09-021
Spray and Combustion Characteristics of Compressed Ignition Type LPG Fuel at Various Additive Ratios for Enhancing Cetane Number
This research investigated the spray and combustion characteristics of compressed ignition type LPG fuel at various additive ratios for enhancing cetane number in a constant volume chamber. Since LPG fuel has a low cetane number, di-tert-butyl peroxide (DTBP) and alpha olefin were added to the LPG (100% butane) to enhance cetane number and lubricity in LPG fuel. The addition of the cetane enhancers makes possible to provide stable combustion over wide ranges of the ambient conditions. In order to investigate spray and combustion progress of LPG fuel, premixed combustion was made by the mixture of hydrogen, oxygen and nitrogen under the ambient condition of high pressure and temperature and then liquefied LPG was injected directly to a constant volume chamber. For the visualization of the phenomena of combustion process of LPG fuel, high speed digital camera was also applied. It turned out exhaust emissions particularly in carbon monoxide and hydrocarbon were reduced considerably by adding DTBP and alpha olefin. Compared to other cases of blended LPG fuel, hydrocarbon emission decreased much more in LPG blended fuel of 15wt% of DTBP.
Session: Alternative Fuels II