Investigations on premixed charge compression ignition type combustion using butanol-diesel blends

Abstract

Investigations on premixed charge compression ignition type combustion using butanol-diesel blends Abstract Renewable biodegradable butanol blended to diesel fuel was used in an engine that operates on PCCI mode shows excellent combustion characteristics and offer efficient high load performance with minimum exhaust emissions. Its higher octane number prevents engine knock, higher cooling effects have potential to reduce the NOX emissions and well-mixing ability with air substantially reduces the smoke emission. In the present experimentation, n-butanol and diesel blend B10, B20, B30 and B40 were tested on PCCI mode which was mainly accomplished by DI timing 20 degree CA bTDC and injection pressure 400 bar. For high load operation, B40 blend provided 6.9%, 8.1%, 12.9% and 13.7% higher brake thermal efficiency over B30, B20, B10 and neat diesel respectively at the cost of small increment in brake specific fuel consumptions. Smoke and CO emissions reduction were observed. However, NO and HC emissions produced were higher than the B30, B20, B10 and diesel respectively. Considering the benefits in terms of higher high load efficiency and lower emissions, in addition, delayed CA50 (50% burn at crank angle) than all fuel blends, B40 blend was preferred for higher premixing to attain higher performance.

Lubricity of Ethanol–Diesel Fuel Blends—Study with the Four-Ball Machine Method

“…For decades, vegetable oil esters have been added to diesel fuel in these types of engines; more recently, there has been increased interest in using various alcohols as fuel additives [ 15 , 16 , 17 , 18 , 19 ]. Ethanol is a particular focus in this area of research because it can be produced from plants and can therefore be considered a fully renewable fuel [ 19 , 20 , 21 , 22 , 23 ].…”

“…However, due primarily to its very low cetane number, i.e., a very low propensity for self-ignition, as shown in [ 23 , 24 , 25 , 26 , 27 , 28 ], ethanol cannot be used as a pure fuel in diesel engines. For this reason, blending diesel fuel with ethanol is considered a viable option, especially given the fact that dehydrated ethanol has been shown to have relatively good miscibility with diesel fuel [ 24 , 29 , 30 ].…”

“…For this reason, blending diesel fuel with ethanol is considered a viable option, especially given the fact that dehydrated ethanol has been shown to have relatively good miscibility with diesel fuel [ 24 , 29 , 30 ]. Blends with higher percentages of ethanol in diesel fuel require significant modifications to adapt their parameters to the requirements of typical diesel fuels; therefore, studies are mostly focused on diesel–ethanol blends containing up to 15% ( v / v ) ethanol [ 23 ].…”

The Impact on Emissions When an Engine Is Run on Fuel with a High Heavy Alcohol Content

“…Interesting experimentation are presented in [20]. On PCCI (premixed charged compression/ignition combustion) engine mode were tested a diesel n-Butanol (B10, B20, B30 and B40) blends.…”