Comparisons of Diesel Spray Liquid Penetration and Vapor Fuel Distributions With In-Cylinder Optical Measurements

[+] Author and Article Information
Laura M. Ricart, Rolf D. Reltz

Engine Research Center, University of Wisconsin-Madison, Madison, WI 53706

John E. Dec

Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94550

J. Eng. Gas Turbines Power 122(4), 588-595 (Aug 31, 1999) (8 pages) doi:10.1115/1.1290591 History: Received October 15, 1998; Revised August 31, 1999
Copyright © 2000 by ASME
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Schematic of optical-access diesel engine showing the laser sheet along the fuel jet axis. Images were obtained from both the cylinder-head window and the piston-crown window.
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Perspective view of the computational grid for the Cummins optical-access engine (at TDC) with the computational spray
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Measured and predicted cylinder pressure for the base operating condition
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Liquid fuel penetration as predicted by KH and KH-RT model and measured for the base operating condition
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Spray profiles as predicted by the KH and the KH-RT spray models
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Droplet size distributions as predicted by the KH and the KH-RT spray models
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Vapor-fuel mass fraction (a) and equivalence ratio (b) as predicted by the KH and the KH-RT spray breakup models
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Measured (left) and predicted (right) temperature distribution in a plane 9 mm below the cylinder head and 27 mm from the injector nozzle. The field of view is 18 mm×12.5 mm.
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Soot mass fraction distribution in the plane of the spray axis as predicted by the KH and the KH-RT models at 3 deg BTDC. The spray profile has been superimposed for reference.
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Predicted (dashed line) and measured (solid line) cylinder pressure and spray tip penetration for the range of operating conditions studied by Espey and Dec 4. Predictions are for the KH-RT model. For the spray tip penetration, the measured values are shown by the solid squares, the penetration of the farthest droplet is in the solid line and the penetration of 90 percent of the liquid mass is shown by the dashed line.



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