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TECHNICAL PAPERS: Internal Combustion Engines

Multidimensional Predictions of In-Cylinder Turbulent Flows: Contribution to the Assessment of k-ε Turbulence Model Variants for Bowl-in-Piston Engines

[+] Author and Article Information
Mirko Baratta, Andrea E. Catania, Ezio Spessa

Dipartimento di Energetica, LAQ Motori a Combustione Interna,1 Politecnico di Torino, Corso Duca degli Abruzzi, 24, Torino 10129, Italy

Rui L. Liu

Tianjin College of Transportation Engineering, 1 Dongjuzi, Hedong District, Tianjin 300161, People’s Republic of China

J. Eng. Gas Turbines Power 127(4), 883-896 (Sep 20, 2005) (14 pages) doi:10.1115/1.1852567 History: Received October 24, 2003; Revised June 01, 2004; Online September 20, 2005
Copyright © 2005 by ASME
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References

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Figures

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Cell points used for discretization
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Staggered grid control volumes
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Model engine. Cylinder bore: 75.4 mm; stroke: 94 mm; bumping clearance: 0.6 mm (bowl in piston), 16.49 mm (flat piston); bowl diameter: 23.5 mm; bowl depth: 41 mm; compression ratio: 6.7; valve diameter: 34 mm; maximum valve lift: 8 mm; valve seat angle: 60 deg.
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Numerical accuracy test (TDC, z=5 mm)
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Flow evolution for flat-piston arrangement—θ=72 deg (a), θ=180 deg (b), from left to right: velocity, TI,l * , τ* fields
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Flow evolution for flat-piston arrangement—θ=360 deg (a), θ=432 deg (b), from left to right: velocity, TI,l * , τ* fields
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Flow evolution for bowl-in-piston arrangement—θ=90 deg (a), θ=180 deg (b), from left to right: velocity, TI,l * , τ* fields
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Flow evolution for bowl-in-piston arrangement—θ=360 deg (a), θ=432 deg (b), from left to right: velocity, TI,l * , τ* fields
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Squish shape at θ=324 deg and θ=390 deg
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Radial profiles of axial mean velocity and turbulence intensity—bowl-in-piston arrangement: (a) θ=36 deg, (b) θ=324 deg, (c) θ=360 deg
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Radial profiles of axial mean velocity and turbulence intensity—flat-piston arrangement: (a) θ=324 deg, (b) θ=360 deg
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Comparison between homemade and STAR-CD® code results

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