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Hydrodynamic Lubrication

Numerical Analysis of Laser-Textured Piston-Rings in the Hydrodynamic Lubrication Regime

[+] Author and Article Information
Gonzalo Brito Gadeschi

 Ingenieurgesellschaft für Strukturanalyse und Tribologie Schloss-Rahe-Str. 12, 52072, Aachen Germanygonzalo.brito.gadeschi@ist-aachen.com Institut für Maschinenelemente und Konstruktionstechnik, Universität Kassel, Moenchebergstrasse 3-7, Kassel, 34125 Germanygonzalo.brito.gadeschi@ist-aachen.com

Katja Backhaus

 Ingenieurgesellschaft für Strukturanalyse und Tribologie Schloss-Rahe-Str. 12, 52072, Aachen Germanykatja.backhaus@ist-aachen.com Institut für Maschinenelemente und Konstruktionstechnik, Universität Kassel, Moenchebergstrasse 3-7, Kassel, 34125 Germanykatja.backhaus@ist-aachen.com

Gunther Knoll

 Ingenieurgesellschaft für Strukturanalyse und Tribologie Schloss-Rahe-Str. 12, 52072, Aachen Germanygunter.knoll@imk.uni-kassel.de Institut für Maschinenelemente und Konstruktionstechnik, Universität Kassel, Moenchebergstrasse 3-7, Kassel, 34125 Germanygunter.knoll@imk.uni-kassel.de

J. Tribol 134(4), 041702 (Sep 04, 2012) (8 pages) doi:10.1115/1.4007347 History: Received December 12, 2011; Revised August 03, 2012; Published September 04, 2012; Online September 04, 2012

In this work, the performance of barrel-shaped laser-textured piston rings is numerically investigated. The surface texture, parameterized by the dimple density, dimple depth, and dimple distribution pattern, is optimized to minimize the friction coefficient for piston rings of variable curvature. We consider fully textured as well as partially textured piston rings with two different dimple distributions patterns: a central dimple distribution, and a distribution along the piston ring edges. Finally, the sensitivity of the optimal surface parameters to the piston ring curvature is assessed.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

The piston/cylinder liner system (top). Magnified, a piston ring segment (bottom) is partially textured with microdimples.

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Figure 2

Pressure distributions for flat-faced and barrel-faced piston rings with both (a) central and (b) edge texture patterns

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Figure 3

Geometrical parameters of the piston ring/cylinder liner system for both central (light gray) and edge (dark gray) textured piston rings. The piston ring cross section of a single row of dimples is shown (bottom); the dashed part indicates the half of the row that is considered by means of symmetric boundary conditions.

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Figure 4

Load capacity Cp of a flat-faced slider as a function of the dimple depth a, length b, and density s ratios for (a) single one-dimensional and (b) single two-dimensional dimples. Optimums are found for both one-dimensional (aopt=1.866 and bopt=2.55) and two-dimensional (aopt≈ 2.0 and sopt≈0.6) dimples.

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Figure 5

Two types of texture patterns, “regular” and “shifted,” are shown (left). The optimal dimple length perpendicular to the slider movement is found, however, at the limit BD,opt≈BD→B, producing the same “optimal” texture pattern for both configurations (right).

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Figure 6

Load capacity Cp and dimensionless friction force Cf for fully textured piston rings (α=1.0) as a function of the piston ring curvature κ for different dimple density ratios s, and a=2

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Figure 7

Friction coefficient Cμ as a function of the dimensionless curvature κ for fully textured piston rings with different dimple density ratios s

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Figure 8

Symmetric pressure distribution in y direction of central (left) and edge (right) partially textured piston rings for different values of κ. The grid represents the adaptive mesh used in the simulations.

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Figure 9

The sensitivity of the load capacity Cp to the dimensionless curvature κ, the dimple depth ratio a, and the dimple density ratio s is studied for small values of the dimensionless curvature κ < 0.06

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Figure 10

Load capacity Cp and friction force Cf of central-textured piston rings as a function of the dimensionless curvature κ for different values of the partial-texturing parameter α, and dimple depth and density ratios of a=2 and s=0.4, respectively

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Figure 11

Load capacity Cp and friction force Cf of edge-textured piston rings as a function of the dimensionless curvature κ for different values of the partial-texturing parameter α, and dimple depth and density ratios of a=2 and s=0.4, respectively

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Figure 12

Friction coefficient Cμ of central-textured and edge-textured piston rings as a function of the dimensionless curvature κ for different values of the partial-texturing parameter α, and dimple depth and density ratios of a=2 and s=0.4, respectively

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Figure 13

Symmetric pressure distribution in y direction of untextured (left) and fully textured (right) piston rings for different values of κ. The grid represents the adaptive mesh used in the simulations.

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Figure 14

Flow-rate imbalance fE for fully textured (α=1.0) and partially textured (α=0.8) piston rings (with a=2.0) as well as for untextured piston rings

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