A simple two-zone mass transfer model was used to predict the mean squish velocity history at the rim of a conventional bowl-in-piston combustion chamber. The chamber’s geometry produces gas flow that converges radially inwards (“squish”) as TDC (top dead center) is approached. The squish flow generates turbulence, which can be used to enhance the combustion rate. When compared with PIV (particle image velocimetry) measurements, the peak squish velocity at the bowl rim was 12% less than the value predicted by the simple mass transfer model. After a thorough examination, the assumption of uniform density in the simple model was strongly suspected to be the cause of this discrepancy. Improvements were made to the simple model to account for density variations that are caused by nonuniform heat transfer in the combustion chamber. The revised model yielded velocities that were in close agreement with PIV measurements.
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April 2006
Technical Papers
Experimental Validation of an Improved Squish Velocity Model for Bowl-in-Piston Combustion Chambers
P. Lappas,
P. Lappas
Department of Mechanical Engineering,
e-mail: lappas@mech.ubc.ca
The University of British Columbia
, Vancouver, BC V6T 1Z4, Canada
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R. L. Evans
R. L. Evans
Department of Mechanical Engineering,
The University of British Columbia
, Vancouver, BC V6T 1Z4, Canada
Search for other works by this author on:
P. Lappas
Department of Mechanical Engineering,
The University of British Columbia
, Vancouver, BC V6T 1Z4, Canadae-mail: lappas@mech.ubc.ca
R. L. Evans
Department of Mechanical Engineering,
The University of British Columbia
, Vancouver, BC V6T 1Z4, CanadaJ. Eng. Gas Turbines Power. Apr 2006, 128(2): 403-413 (11 pages)
Published Online: July 16, 2005
Article history
Received:
February 24, 2004
Revised:
July 16, 2005
Citation
Lappas, P., and Evans, R. L. (July 16, 2005). "Experimental Validation of an Improved Squish Velocity Model for Bowl-in-Piston Combustion Chambers." ASME. J. Eng. Gas Turbines Power. April 2006; 128(2): 403–413. https://doi.org/10.1115/1.2130730
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