The topic of this paper is the computational modeling of gas injection through various poppet valve geometries in a large bore engine. The objective of the paper is to contribute to a better understanding of the significance of the poppet valve and the piston top in controlling the mixing of the injected fuel with the air in the cylinder. In this paper, the flow past the poppet valve into the engine cylinder is computed for both a low (4 bar) and a high pressure (35 bar) injection process using unshrouded and shrouded valves. Experiments using PLIF (planar laser induced fluorescence) are used to visualize the actual fluid flow for the valve geometries considered. The results indicate that for low injection pressures the gas flow around a typical poppet valve collapses to the axis of symmetry of the valve downstream of the poppet. At high pressure, the gas flow from this simple poppet valve does not collapse, but rather expands outward and flows along the cylinder wall. At high pressures, addition of a shroud around the poppet valve was effective in directing the supersonic flow toward the center of the cylinder. Additional computations with a moving piston show that at top dead center, the flammable volume fraction and turbulence intensity with high pressure shrouded injection are larger than for low pressure injection.
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July 2004
Technical Papers
Computational Modeling of Natural Gas Injection in a Large Bore Engine
Gi-Heon Kim,
Gi-Heon Kim
Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523
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Allan Kirkpatrick,
Allan Kirkpatrick
Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523
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Charles Mitchell
Charles Mitchell
Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523
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Gi-Heon Kim
Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523
Allan Kirkpatrick
Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523
Charles Mitchell
Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523
Contributed by the Internal Combustion Engine Division of ASME for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division October 2002; final revision received by the ASME Headquarters December 2003. Associate Editor: D. Assanis.
J. Eng. Gas Turbines Power. Jul 2004, 126(3): 656-664 (9 pages)
Published Online: August 11, 2004
Article history
Received:
October 1, 2002
Revised:
December 1, 2003
Online:
August 11, 2004
Citation
Kim , G., Kirkpatrick , A., and Mitchell, C. (August 11, 2004). "Computational Modeling of Natural Gas Injection in a Large Bore Engine ." ASME. J. Eng. Gas Turbines Power. July 2004; 126(3): 656–664. https://doi.org/10.1115/1.1762906
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