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- W220069673 abstract "In-cylinder control of particulate emissions in a diesel engine depends on careful control and understanding of the fuel injection and air/fuel mixing process. As yet, it is extremely difficult to measure physical parameters of the injection and mixing process in an operating engine, but it is possible to simulate the diesel combustion chamber in a steady flow configuration whose characteristics can be more easily probed. The approach of this program was to create a steady flow environment whose thermodynamic conditions, air-flow conditions, and injection characteristics matched the conditions in a typical diesel engine (the Cummins L10 engine was chosen as a representative model). Using existing hot-film anemometry, laser diffraction and phase-Doppler techniques, the air-flow turbulence and injection spray were thoroughly characterized under non-combusting conditions. The development of a spray model (based on momentum exchange between the injected fuel and the air) allowed for further characterization and extrapolation of the steady state results to the intermittent engine conditions. Finally, actual emissions measurements were made under combusting conditions so that correlations could be drawn between the measured emissions and the spray and flow conditions measured in the non-combusting cases. The results of those measurements show some interesting aspects of the effect ofmore » air-flow turbulence and spray characteristics on combustion. Increased air-flow turbulence was found to decrease particulates, CO, and unburned hydrocarbons, while C0{sub 2} and NO{sub x} levels were increased.« less" @default.
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- W220069673 date "1991-07-01" @default.
- W220069673 modified "2023-09-27" @default.
- W220069673 title "A study of the interaction of the flow field and the fuel jet in particulate formation as related to diesel engines. Final report, [16 July 1987--15 July 1991]" @default.
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