Looking into a laser textured piston ring-liner contact

Vlădescu, Sorin-Cristian; Ciniero, Alessandra; Tufail, Khizer; Gangopadhyay, Arup; Reddyhoff, Tom

doi:10.1016/j.triboint.2017.04.051

Cited by 92 publications

(52 citation statements)

References 52 publications

(98 reference statements)

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“…This is particularly significant for contacts with parallel and flat surfaces, such as those encountered in mechanical seals and parallel thrust bearings. Furthermore, the subambient pressure zones formed in textures close to the contact inlet due to the fluid cavitation phenomenon responsible for the aforementioned micro-hydrodynamic bearing effect may also contribute to drawing additional lubricant into the contact (inlet-suction effect) [27,29,30]. However, it needs to be pointed out that an inappropriate choice of texture parameters (i.e., texture depth, width, and density) may lead to detrimental effects due to the excessive increase of the cavitation zones, which may reduce the local film thickness and the load carrying capacity [31].…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

2019

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Surface texturing has been frequently used for tribological purposes in the last three decades due to its great potential to reduce friction and wear. Although biological systems advocate the use of hierarchical, multi-scale surface textures, most of the published experimental and numerical works have mainly addressed effects induced by single-scale surface textures. Therefore, it can be assumed that the potential of multi-scale surface texturing to further optimize friction and wear is underexplored. The aim of this review article is to shed some light on the current knowledge in the field of multi-scale surface textures applied to tribological systems from an experimental and numerical point of view. Initially, fabrication techniques with their respective advantages and disadvantages regarding the ability to create multi-scale surface textures are summarized. Afterwards, the existing state-of-the-art regarding experimental work performed to explore the potential, as well as the underlying effects of multi-scale textures under dry and lubricated conditions, is presented. Subsequently, numerical approaches to predict the behavior of multi-scale surface texturing under lubricated conditions are elucidated. Finally, the existing knowledge and hypotheses about the underlying driven mechanisms responsible for the improved tribological performance of multi-scale textures are summarized, and future trends in this research direction are emphasized.

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Section: Introductionmentioning

confidence: 99%

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

2019

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“…However, it is worth highlighting that the Reynolds equation based model used in this work is not suitable to properly reproduce the lubricant flow within pores or other very deep topographic features (see more in-depth discussions about the effect of dimples on lubrication in Refs. [19,20]).…”

Section: Resultsmentioning

confidence: 99%

Effect of waviness and roughness on cylinder liner friction

Tomanik

Mansori

Souza

et al. 2018

Tribology International

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The tribological performance of piston ring-cylinder bore was investigated through deterministic mixedlubrication modeling. Bore topographies measured from regular honed Gray Cast Iron (GCI) to "Mirror-Like" coated bore surfaces were used in the investigation. In contrast with typical honed GCI bores composed of relatively well-distributed peaks and valleys, coated bores are composed of a much smoother plateau and localized deep pores. Simulation results indicated that coated bore surfaces generate significantly higher hydrodynamic pressure and lower asperity contacts when compared with regular GCI topographies. The influence of roughness filtering and the associated cutoffs values were also considered in the analysis, showing that the choice of cutoff affects both the predicted hydrodynamic and asperity contact pressures. Furthermore, the simulation results also revealed that most of the fluid pressure was generated by the honing grooves rather than by the localized pores present on coated bore surfaces.

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“…The change of direction makes the cavitated region of the outlet the new inlet region in the subsequent stroke. 46,47 It was also observed that the region of starvation can occur for 5% of the stroke. However, this will be dependent upon the viscosity of the lubricant.…”

Section: Methodsmentioning

confidence: 96%

An investigation into the oil transport and starvation of piston ring pack

Bewsher

Mohammadpour

Rahnejat

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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In order to accurately predict the lubricant film thickness and generated friction in any tribological contact, it is important to determine appropriate boundary conditions, taking into account the oil availability and extent of starvation. This paper presents a two-dimensional hydrodynamic model of a piston ring pack for prediction of lubricant film thickness, friction and total power loss. The model takes into account starvation caused by reverse flow at the conjunctional inlet wedge, and applied to a ring pack, comprising a compression and scraper ring. Inlet boundaries are calculated for an engine cycle of a four-cylinder, four-stroke gasoline engine operating at 1500 r/min with conditions pertaining to the New European Drive Cycle. The analysis shows the two main sources of starvation: first, due to a physical lack of inlet meniscus and second, due to reverse flow at the inlet wedge significantly affecting the prevailing conditions from the generally assumed idealised boundary conditions. Such an approach has not hitherto been reported in literature.

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Looking into a laser textured piston ring-liner contact

Abstract: Abstract

Cited by 92 publications

References 52 publications

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

Effect of waviness and roughness on cylinder liner friction

An investigation into the oil transport and starvation of piston ring pack

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