Water and diesel fuel emulsions containing 13% and 26% water by volume were investigated in a modern diesel engine with relatively early pilot injection, supercharging, and cooled EGR. The heat release from the pilot injection with water emulsions is retarded toward the top dead center due to the poor ignitability, which enables larger pilot and smaller main injection quantities. This characteristic results in improvements in the thermal efficiency due to the larger heat release near the top dead center and the smaller afterburning. With the 26% water emulsion, mild, smokeless, and very low NOx operation is possible at an optimum pilot injection quantity and 15% intake oxygen with EGR at or below 0.9 MPa IMEP, a condition where large smoke emissions are unavoidable with regular unblended diesel fuel. Heat transfer analysis with Woschni's equation did not show the decrease in cooling loss with the water emulsion fuels. Single spray combustions with the water emulsions and the regular unblended diesel fuel in a constant volume combustion vessel were analyzed with a high-speed video and a 2-D two-color method. With the water emulsion fuel, premixing is promoted with longer ignition delays, and the duration and the scale of the luminous and high temperature flame decreases.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Combustion Characteristics of Emulsified Blends of Water and Diesel Fuel in a Diesel Engine with Cooled EGR and Pilot Injection




    Publication date :

    2013


    Size :

    9 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Combustion Characteristics of Dual-Fuel Diesel Engine Using Emulsified Bio-Fuel for Pilot Ignition

    Namasivayam, A. M. / Bob-Manuel, K. D. H. / Crookes, R. J. et al. | SAE Technical Papers | 2009


    Combustion characteristics of dual-fuel diesel engine using emulsified bio-fuel for pilot ignition

    Namasivayam,A.M. / Crookes,R.J. / Korakianitis,T. et al. | Automotive engineering | 2009


    Injection characteristics of emulsified fuel and the effects of EGR and emulsified fuel on diesel combustion

    Park,K. / Park,T.I. / Korea Inst.of Machinery and Materials,KR | Automotive engineering | 1998