Accession Number : ADA290574

Title :   MTBE for Improved Diesel Combustion and Emissions?

Corporate Author : RUTGERS - THE STATE UNIV PISCATAWAY NJ

Personal Author(s) : Kajitani, Shuichi ; Usisaki, H. ; Clasen, E. ; Campbell, S. ; Rhee, K. T.

Report Date : 24 SEP 1994

Pagination or Media Count : 12

Abstract : Reduced emissions from the spark-ignition engine, when fueled by gasoline containing small amounts of MTBE, have led us to explore similar positive results in compression-ignition (CI) engine combustion by adding this oxygenate compound to Diesel fuel. This study was performed in two separate laboratories by employing the respective experimental apparatus. When a pre-chamber type CI engine was operated by using Diesel fuel mixed with several volume portions of MTBE, including 5, 10 and 15%, several positive results were obtained, as compared with those from the baseline neat Diesel-fueled operations: (1) The engine delivers overall comparable or better performance characteristics, (2) The brake thermal efficiency is higher at the advanced and late injection times; (3) Some considerable reduction of both soot and NOx emissions is found; (4) The ignition delay increases but the combustion duration decreases. In order to help explain the unexpected responses of CI combustion to the above fuel modifications, high-speed in-cylinder spectral infrared digital imaging was performed for the same fuel modification. Some plausible and consistent results are observed, which help explain the above findings.

Descriptors :   *EMISSION, *DIESEL FUELS, *CHAMBERS, THERMAL PROPERTIES, REPRINTS, INJECTION, MODIFICATION, EFFICIENCY, CONSISTENCY, REDUCTION, TIME, COMBUSTION, FUELS, SOOT, ENGINES, DIESEL ENGINES, BRAKES, GASOLINE, IGNITION LAG, SPARK IGNITION ENGINES.

Subject Categories : Combustion and Ignition
      Fuels
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE