Numerical Simulation of Piston Ring in Mixed Lubrication—A Nonaxisymmetrical Analysis

Hu, Yanqiang; Cheng, H. S.; Arai, Takafumi; Kobayashi, Yoichi; Aoyama, Shunichi

doi:10.1115/1.2928867

Cited by 163 publications

(108 citation statements)

References 6 publications

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“…Predictions of frictional behavior of nominally flat surfaces under mixed lubrication compare reasonably well to corresponding experimental data (Makino et al, 1999). Several researchers (Rohde et al, 1980;Hu et al, 1994;Akalin and Newaz, 2001) have combined the average Reynolds equation with the Greenwood-Tripp rough surface contact model to predict piston ring lubrication. However, these models lack recent developments with respect to flow factors, and most have not been validated against experimental data.…”

Section: B Single Ring Model and Comparison To Test Rig Datamentioning

confidence: 74%

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Reduced Engine Friction and Wear

Matthews¹

2005

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Section: B Single Ring Model and Comparison To Test Rig Datamentioning

confidence: 74%

“…In the mixed and boundary lubrication regimes, friction arises from the shearing of asperities and thin films. The total friction force per unit segment length of the piston ring can be expressed as (Hu et al, 1994;Akalin and Newaz, 2001):…”

Section: B5 Boundary and Equilibrium Conditionsmentioning

confidence: 99%

Reduced Engine Friction and Wear

Matthews¹

2005

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“…Hence, a decrease in minimum oil film thickness results in an increase in the area of asperity contact. Therefore the results of n  [2,6] are better for generating a minimum oil film thickness.…”

Section: Effect Of Design Parameter N On Minimum Oil Film Thicknessmentioning

confidence: 99%

Design approach for optimization of a piston ring profile considering mixed lubrication

Zhang

Xie

2016

Friction

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Abstract:To reduce the friction of a piston ring while maintaining a large oil film load-carrying capacity, an approach comprising of the inverse method and the sequential quadratic programming algorithm was proposed. The approach considers the variation of mixed lubrication and variable lubricant viscosity with temperature along the engine stroke, is developed to optimize the profile of a piston ring. A piston ring profile is represented by a polynomial function. A case study of the second piston ring shows that the proposed method can be applied for the optimization of a piston ring profile. In addition, this paper illustrates the effects of the degree of a polynomial function. The results show that the minimization of friction and maximization of oil film load-carrying capacity can be balanced simultaneously when the degree of the polynomial is 2 and 5.

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“…(2.1), and p c is the contact pressure between the two surfaces. The contact pressure is given by the following empirical fit used by Hu [12] based on Greenwood-Tripp's theory [13]:…”

Section: Pure Boundary Frictionmentioning

confidence: 99%

Low-Engine-Friction Technology for Advanced Natural-Gas Reciprocating Engines

Wong¹,

Tian²,

Moughon³

et al. 2004

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This program aims at improving the efficiency of advanced natural-gas reciprocating engines (ANGRE) by reducing piston/ring assembly friction without major adverse effects on engine performance, such as increased oil consumption and emissions. An iterative process of simulation, experimentation and analysis, are being followed towards achieving the goal of demonstrating a complete optimized low-friction engine system. To date, a detailed set of piston/ring dynamic and friction models have been developed and applied that illustrated the fundamental relationships between design parameters and friction losses. Various lowfriction strategies and ring-design concepts have been explored, and engine experiments have been done on a full-scale Waukesha VGF F18 in-line 6 cylinder power generation engine rated at 370 kW at 1800 rpm.Current accomplishments include designing and testing ring-packs using a subtle topcompression-ring profile (skewed barrel design), lowering the tension of the oil-control ring, employing a negative twist to the scraper ring to control oil consumption. Initial test data indicate that piston ring-pack friction was reduced by 35% by lowering the oil-control ring tension alone, which corresponds to a 1.5% improvement in fuel efficiency. Although small in magnitude, this improvement represents a first step towards anticipated aggregate improvements from other strategies. Other ring-pack design strategies to lower friction have been identified, including reduced axial distance between the top two rings, tilted top-ring groove. Some of these configurations have been tested and some await further evaluation. Colorado State University performed the tests and Waukesha Engine Dresser, Inc. provided technical support.Key elements of the continuing work include optimizing the engine piston design, application of surface and material developments in conjunction with improved lubricant properties, system modeling and analysis, and continued technology demonstration in an actual full-sized reciprocating natural-gas engine.-3 -

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Numerical Simulation of Piston Ring in Mixed Lubrication—A Nonaxisymmetrical Analysis

Cited by 163 publications

References 6 publications

Reduced Engine Friction and Wear

Reduced Engine Friction and Wear

Design approach for optimization of a piston ring profile considering mixed lubrication

Low-Engine-Friction Technology for Advanced Natural-Gas Reciprocating Engines

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