A detailed chemistry-based CFD model was developed to simulate the diesel spray combustion and emission process. A reaction mechanism of -heptane is coupled with a reduced mechanism to simulate diesel fuel oxidation and formation. The soot emission process is simulated by a phenomenological soot model that uses a competing formation and oxidation rate formulation. The model is applied to predict the diesel spray lift-off length and its sooting tendency under high temperature and pressure conditions with good agreement with experiments of Sandia. Various nozzle diameters and chamber conditions were investigated. The model successfully predicts that the sooting tendency is reduced as the nozzle diameter is reduced and/or the initial chamber gas temperature is decreased, as observed by the experiments. The model is also applied to simulate diesel engine combustion under premixed charge compression ignition (PCCI) conditions. Trends of heat release rate, , and soot emissions with respect to EGR levels and start-of-injection timings are also well predicted. Both experiments and models reveal that soot emissions peak when the start of injection (SOI) occurs close to TDC. The model indicates that low soot emission at early SOI is due to better oxidation while low soot emission at late SOI is due to less formation. Since emissions decrease monotonically with injection retardation, a late injection scheme can be utilized for simultaneous soot and reduction for the engine conditions investigated in this study.
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e-mail: kong@iastate.edu
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January 2007
Technical Papers
Modeling Diesel Spray Flame Liftoff, Sooting Tendency, and Emissions Using Detailed Chemistry With Phenomenological Soot Model
Song-Charng Kong,
Song-Charng Kong
Engine Research Center,
e-mail: kong@iastate.edu
University of Wisconsin
, 1500 Engineering Drive, Madison, WI 53706
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Yong Sun,
Yong Sun
Engine Research Center,
University of Wisconsin
, 1500 Engineering Drive, Madison, WI 53706
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Rolf D. Rietz
Rolf D. Rietz
Engine Research Center,
University of Wisconsin
, 1500 Engineering Drive, Madison, WI 53706
Search for other works by this author on:
Song-Charng Kong
Engine Research Center,
University of Wisconsin
, 1500 Engineering Drive, Madison, WI 53706e-mail: kong@iastate.edu
Yong Sun
Engine Research Center,
University of Wisconsin
, 1500 Engineering Drive, Madison, WI 53706
Rolf D. Rietz
Engine Research Center,
University of Wisconsin
, 1500 Engineering Drive, Madison, WI 53706J. Eng. Gas Turbines Power. Jan 2007, 129(1): 245-251 (7 pages)
Published Online: December 15, 2005
Article history
Received:
May 16, 2005
Revised:
December 15, 2005
Citation
Kong, S., Sun, Y., and Rietz, R. D. (December 15, 2005). "Modeling Diesel Spray Flame Liftoff, Sooting Tendency, and Emissions Using Detailed Chemistry With Phenomenological Soot Model." ASME. J. Eng. Gas Turbines Power. January 2007; 129(1): 245–251. https://doi.org/10.1115/1.2181596
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