Experimental Investigation on CRDI System Assisted Diesel Engine Fulled by Diesel with Nanotubes

This paper reports on the use of carbon multiwalled nanotubes as additive to the diesel fuel and the effects of their operational characteristics and performance, emission and combustion characteristics of the CRDI system assisted diesel engine. In this study, the tested fuels were prepared by dispersing carbon multiwalled nanotubes into the diesel fuel at the mass fraction of 25 and 50 ppm with the help of a mechanical homogenizer and an ultrasonicator. Experimental results showed that the flash points and cetane number of the fuels dispersed with carbon multiwalled nanotubes have increased with higher concentration of carbon multiwalled nanotubes. Based on the experimental results, NO_x emissions and smoke noticeably decrease, while CO emissions dramatically increase with increasing the dosing level of carbon multiwalled nanotubes. At the full load, the magnitude of NO_x and smoke emission for the neat diesel was 1282 ppm and 69HSU, whereas it was 910 ppm and 49HSU for the CMNT50 fuel, respectively. The results also showed a significant enhancement in brake thermal efficiency and heat release rate due to the influence of the carbon multiwalled nanotubes addition in diesel blend.