Fuel Distributions in a Firing Direct-Injection Spark-Ignition Engine Using Laser-Induced Fluorescence Imaging 950110
Two- and three-dimensional images of fuel distributions in a continuously firing direct-injection stratified-charge engine have been recorded under moderate-load conditions using planar laser-induced fluorescence (LIF) from commercial gasoline. Cyclic variations in the fuel concentration at the spark gap (deduced from individual-cycle two-dimensional images) appear sufficient to account for the observed incidence of misfires and partial burns. Tomographic three-dimensional LIF images of the average fuel distribution at the time of spark indicate that ignitable mixture is present only in a thin shell around the periphery of the fuel cloud. Differences in power output and combustion stability during engine warm-up observed with two injectors of the same type are reflected in systematic differences in the fuel concentration near the spark gap as inferred from LIF data.
Citation: Fansler, T., French, D., and Drake, M., "Fuel Distributions in a Firing Direct-Injection Spark-Ignition Engine Using Laser-Induced Fluorescence Imaging," SAE Technical Paper 950110, 1995, https://doi.org/10.4271/950110. Download Citation
Todd D. Fansler, Donald T. French, Michael C. Drake
Thermosciences Dept. General Motors Research and Development Center Warren, MI, Physical Chemistry Dept. General Motors Research and Development Center Warren, MI
International Congress & Exposition
Direct Fuel Injection for Gasoline Engines-PT-80, Engine Combustion and Flow Diagnostics-SP-1090, Two-Stroke Engines-PT-69, SAE 1995 Transactions: Journal of Engines-V104-3