Accession Number : ADA332339

Title :   Diesel Engine Cold-Starting Studies: Optically Accessible Engine Experiments and Modeling.

Descriptive Note : Final rept.,

Corporate Author : WAYNE STATE UNIV DETROIT MI CENTER FORAUTOMOTIVE RESEARCH

Personal Author(s) : Henein, Naeim A. ; Lai, Ming-Chia

PDF Url : ADA332339

Report Date : 01 MAY 1997

Pagination or Media Count : 70

Abstract : An experimental and numerical study was carried out to simulate the diesel spray breakup, vaporization, ignition, and combustion during cold starting conditions. This report summarizes the optical diagnostics and multi-dimensional computation results for two single-cylinder optically accessible engines. The results showed that optically accessible engines provide very useful information for studying the diesel cold starting conditions, which also provide a critical test for diesel combustion models. The pre-ignition chemistry showed great sensitivity to the compressed air temperature. KIVA with a modified shell model responds accordingly to the change of inlet air temperatures and fuel injection parameters. However, other submodels do not have enough sensitivity to simulate the starting of diesel engine without careful validation and further improvements. A method to compute the ignition delay in engines from data obtained in constant volume vessels was also developed. The method accounts for the effect of variations in charge pressure and temperature on the formation of the chain carriers from the combustible mixture during the ID period. A comparison is made between the computed ID and data obtained in a LABECO research engine under different ambient temperatures ranging from +200 to - 100 C.

Descriptors :   *DIESEL ENGINES, *COMBUSTION, *IGNITION LAG, LOW TEMPERATURE, NUMERICAL ANALYSIS, MIXTURES, OPTICAL ANALYSIS, DIAGNOSIS(GENERAL), IGNITION, RANGE(EXTREMES), STARTING, DIESEL FUELS, COMPRESSED AIR, VAPORIZATION, ENGINE CYLINDERS.

Subject Categories : Combustion and Ignition
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE