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Abstract
Results from a unique experimental system that quantifies combustion products from a single diesel combustion event are presented and the implications of these results are discussed. Data presented in this paper are the emission levels for carbon monoxide and nitric oxide, normalized by carbon dioxide produced, as a function of fuel quantity injected. Carbon monoxide is notably present in very short duration (or small mass) injection burns where the spray event concludes before the beginning of the major heat release. However, the trend for NO emission levels appears to be influenced by the interaction of combustion with injection. For events with an overlap between injection and the combustion event, reduced NO emission levels are observed. Examination of data from engines indicates a similar trend in NO emission behavior; residence time effects and/or entrainment of post combustion gases into the fuel jet are hypothesized as the physical mechanisms that explain the overall emission behavior.
This work has been supported by a National Science Foundation Career Award #CTS-9502481 and NSF #CTS-0072967, Dr. Farley Fisher, Contract Manager and NREL, Dr. Shaine Tyson, Contract Manager, partial research student support from a GANN Grant, Department of Education. Raycon, Corp conducted the custom drilling of injector nozzle. The authors would also like to acknowledge Dr. Bob McCormick of the National Renewable Energy Laboratory, Prof. Tony Dean of the Colorado School of Mines, and Dr. Bill Pitz of the Lawrence Livermore Laboratory for their contributions to this work.
Notes
a As determined using correlation from Higgins et al. (Citation1999) for injection into air at a temperature of 873 K, pressure of 30 atm and initial fuel temperature of 423 K.