Moving textures: Simulation of a ring sliding on a textured liner

Checo, Hugo; Ausas, Roberto F.; Jai, Mohammed; Cadalen, Jean Paul; Choukroun, Franck; Buscaglia, Gustavo C.

doi:10.1016/j.triboint.2013.12.013

Cited by 71 publications

(77 citation statements)

References 26 publications

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“…The implementation of the partially textured flat face rings in the real engine conditions by Etsion and Sher [2] has nevertheless shown that the textured flat face rings out-perform the untextured barrel shaped ones in terms of BSFC by ~1 to 4% depending on the engine loading and speed conditions. Checo et al [32] also investigated the effect of surface texturing with a number of generated ring profiles. They found that as the ring's radius of curvature increased a greater benefit was accrued.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact

Morris

Rahmani

Rahnejat

et al. 2015

Journal of Tribology

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Minimisation of parasitic losses in the internal combustion engine is essential for improved fuel efficiency and reduced emissions. Surface texturing has emerged as a method palliating these losses in instances where thin lubricant films lead to mixed or boundary regimes of lubrication. Such thin films are prevalent in contact of compression ring to cylinder liner at piston motion reversals because of momentary cessation of entraining motion. The paper provides combined solution of Reynolds equation, boundary interactions and a gas flow model to predict the tribological conditions, particularly at piston reversals. This model is then validated against measurements using a floating liner for determination of in-situ friction of an engine under motored condition. Very good agreement is obtained. The validated model is then used to ascertain the effect of surface texturing of the liner surface during reversals. Therefore, the paper is a combined study of numerical predictions and the effect of surface texturing. The predictions show that some marginal gains in engine performance can be expected with laser textured chevron features of shallow depth under certain operating conditions. Keywords: A c c e p t e d M a n u s c r i p t N o t C o p y e d i t e d

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Section: Introductionmentioning

confidence: 99%

A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact

Morris

Rahmani

Rahnejat

et al. 2015

Journal of Tribology

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“…This is particularly true in cases where cavitation and reformation may occur multiple times within the computational domain of interest (e.g. rough contacts [28], textured surfaces [8,10,11,[29][30][31] and dynamically loaded journal bearings [9,16]). …”

Section: Introductionmentioning

confidence: 99%

Transient effects in lubricated textured bearings

Medina

Fowell

Vlădescu

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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The aim of this paper is to study transient phenomena in hydrodynamic textured bearings. Both convergent and convergent-divergent reciprocating textured bearings are considered. A massconserving formulation of the Reynolds equation recently proposed by some of the authors and used to capture cavitation in steady-state lubricated contacts has been implemented to study transient effects in lubricated textured bearings. It is shown that the proposed solver is capable of capturing the frictional response of bearings characterised by various geometries and loading conditions in both steady-state and transient configurations.Depending on the boundary conditions governing the problems under investigation, changes in load support or film thickness variations are correctly predicted, demonstrating that the methodology developed in this paper is suitable to provide an efficient tool for the design and optimisation of textured bearings. A qualitative comparison with preliminary experimental data obtained using an apparatus developed to study reciprocating textured surfaces is performed, showing that the characteristic transient behaviour of such surfaces in different loading regimes can be correctly captured using the proposed numerical implementation. Current limitations of the proposed methodology and possible extensions of the technique to study elasto-hydrodynamic and mixed lubrication regimes are also discussed.

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“…Different from the expression for the textured ring, the film thickness of the textured liner can be described as [1,16]:…”

Section: Hydrodynamic Cavitation Modelmentioning

confidence: 99%

“…In addition, it appears that the textured liner system has the better friction reduction effect than the textured ring system, when the warm engine operating condition is considered. In fact, when textures are introduced on the liner surface, the wear of the liner would be smaller and more evenly distributed than that of ring [16]. The textures can be preserved in their shapes for a long operating time.…”

Section: Effect Of Coating Mechanical Propertiesmentioning

confidence: 99%

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Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

Meng

Zhang

2017

Friction

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For the ring/liner conjunction, well-designed surface texturing has been regarded as a potential means to improve its tribological performance, as well as the application of coating. However, so far most researchers focused on the one of these aspects. In this study, the combined effect of coating and texturing on the performance of ring/liner conjunction is numerically investigated. A thermal mixed lubrication model is presented. The effects of the coating's thermal and mechanical properties on the tribological performance are studied under the cold and warm engine operating conditions. Along with the increasing coating thickness, the effects of the coating's thermal properties on friction loss are found to be significant, as well as the effects of the coating's mechanical properties. It is also found that a soft coating with a lower thermal inertia has a greater ability to reduce the friction loss of the textured conjunction.

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Moving textures: Simulation of a ring sliding on a textured liner

Cited by 71 publications

References 26 publications

A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact

A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact

Transient effects in lubricated textured bearings

Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

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