Computational fluid dynamic simulations using the AVL FIRE and KIVA 3V codes were performed to examine commonly accepted techniques and assumptions used when simulating direct injection diesel engines. Simulations of a steady-state impulse swirl meter validated the commonly used practice of evaluating the swirl ratio of diesel engines by integrating the valve flow and torque history over discrete valve lift values. The results indicate the simulations capture the complex interactions occurring in the ports, cylinder, and honeycomb cell impulse swirl meter. Geometric details of engines due to valve recesses in the cylinder head and piston cannot be reproduced axisymmetrically. The commonly adopted axisymmetric assumption for an engine with a centrally located injector was tested by comparing the swirl and emissions history for a noncombusting and a double injection low temperature combustion case with varying geometric fidelity. Consideration of the detailed engine geometry including valve recesses in the piston altered the swirl history such that the peak swirl ratio at TDC decreased by approximately 10% compared with the simplified no-recess geometry. An analog to the detailed geometry of the full 3D geometry was included in the axisymmetric geometry by including a groove in the cylinder head of the mesh. The corresponding emissions predictions of the combusting cases showed greater sensitivity to the altered swirl history as the air-fuel ratio was decreased.
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April 2011
Technical Briefs
Examination of Initialization and Geometric Details on the Results of CFD Simulations of Diesel Engines
Michael J. Bergin,
Michael J. Bergin
Engine Research Center,
University of Wisconsin
, Madison, WI 53706
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Ettore Musu,
Ettore Musu
Engine Research Center,
University of Wisconsin
, Madison, WI 53706
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Sage Kokjohn,
Sage Kokjohn
Engine Research Center,
University of Wisconsin
, Madison, WI 53706
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Rolf D. Reitz
Rolf D. Reitz
Engine Research Center,
University of Wisconsin
, Madison, WI 53706
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Michael J. Bergin
Engine Research Center,
University of Wisconsin
, Madison, WI 53706
Ettore Musu
Engine Research Center,
University of Wisconsin
, Madison, WI 53706
Sage Kokjohn
Engine Research Center,
University of Wisconsin
, Madison, WI 53706
Rolf D. Reitz
Engine Research Center,
University of Wisconsin
, Madison, WI 53706J. Eng. Gas Turbines Power. Apr 2011, 133(4): 044501 (4 pages)
Published Online: November 18, 2010
Article history
Received:
June 4, 2009
Revised:
January 7, 2010
Online:
November 18, 2010
Published:
November 18, 2010
Citation
Bergin, M. J., Musu, E., Kokjohn, S., and Reitz, R. D. (November 18, 2010). "Examination of Initialization and Geometric Details on the Results of CFD Simulations of Diesel Engines." ASME. J. Eng. Gas Turbines Power. April 2011; 133(4): 044501. https://doi.org/10.1115/1.4001941
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