A single-cylinder, four-stroke cycle diesel engine was operated on unstabilized water-in-fuel emulsions. Two prototype devices were used to produce the emulsions on-line with the engine. More than 350 test points were run with baseline diesel fuel and emulsified water-in-fuel. Water content of the emulsified fuel varied from about 2% to 23% by volume. Statistically significant decreases in fuel consumption, ranging from 1.2% to 5.1% were obtained with emulsified fuels in 20 out of 36 test conditions. An increase of 2.5% was measured at one condition only. Use of the emulsified fuels decreased oxides of nitrogen by up to about 60% and Bosch smoke numbers by up to almost 70%, whereas unburned hydrocarbons increased up to over 130%. Carbon monoxide changes with emulsified fuel varied from a decrease of 52% to an increase of over 170%, depending on engine speed and power, and water content of the fuel. No problems were encountered in engine operation at any test condition with the water-in-fuel emulsions.

  • Supplemental Notes:
    • Prepared for U.S. Department of Transportation, U.S. Coast Guard Office of Research and Development, Washington, D.C. 20590.
  • Corporate Authors:

    Southwest Research Institute

    Department of Engine and Vehicle Research
    San Antonio, TX  United States  78284
  • Authors:
    • Storment, J O
    • Coon, C W
  • Publication Date: 1978-8

Media Info

  • Pagination: 91 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00187980
  • Record Type: Publication
  • Source Agency: United States Coast Guard
  • Report/Paper Numbers: CG-D-13-78 Final Rpt.
  • Contract Numbers: DOT-TSC-920
  • Files: TRIS
  • Created Date: Feb 3 1979 12:00AM