Validation of a Piston Ring-Pack Lubrication Model that Includes Realistic Lubricant Rheology

Taylor, R. I.; Brown, M. A.; Thompson, Douglas

doi:10.1016/s0167-8922(08)70642-4

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…Taylor et al 22,23 performed a numerical and experimental study on lubricant rheology to examine the effect of viscosity variation with respect to temperature and shear rate. One-dimensional Reynolds equation neglecting squeeze action was employed as governing equation.…”

Section: Hydrodynamic and Elasto-hydrodynamic Lubricationmentioning

confidence: 99%

Piston ring–liner lubrication and tribological performance evaluation: A review

Delprete

Razavykia

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Internal combustion engines are at present used as the major power sources for transportation and power generator. Improvement of the internal combustion engine efficiency is expected due to strict environmental standards and energy costs. Any reduction in oil consumption, friction power losses and emissions results in improving engines’ performance and durability. Automotive industries have intense passion to increase engines’ efficiency to meet the fuel economy and emission standards. Many studies have been conducted to develop reliable approaches and models to understand the lubrication mechanisms and calculate power losses. This review paper summarizes the synthesis of the main technical aspects considered during modeling of piston ring–liner lubrication and friction losses investigations. The literature review highlights the effects of piston ring dynamics, components geometry, lubricant rheology, surface topography and adopted approaches, on frictional losses contributed by the piston ring-pack.

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Section: Hydrodynamic and Elasto-hydrodynamic Lubricationmentioning

confidence: 99%

Piston ring–liner lubrication and tribological performance evaluation: A review

Delprete

Razavykia

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…From the outlined literature it can be said that various successful attempts have been made earlier for tribological study of ring/liner interface. However, in previous reported works [9][10][11][12][13][14][15][16][17][18][19][20] with the notable exception, [21][22] the characteristics of non-Gaussian surfaces have not been explored in detail. The aim of this study is the development of a mixed lubrication model to analyze the frictional force for PRCLC considering non-Gaussian roughness and cavitation.…”

Section: Introductionmentioning

confidence: 99%

“…Quan-bao et al 17 observed 8.3% to 9.4% an increase in the frictional power loss for rough surface having R q = 0.6µm. Taylor et al 18 considered the shear thinning effect in analysis of ring/liner interface, and concluded that neglecting the effect of shear thinning effect overestimates the oil film thickness. Morris et al 19 developed a thermal mixed-EHL model for studying the tribological behavior of piston ring-liner conjunction.…”

Section: Introductionmentioning

confidence: 99%

Research on tribological performance of piston ring/liner conjunction considering non-Gaussian roughness and cavitation

Prajapati

Ramkumar

Katiyar

2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The tribological performance of piston ring-cylinder liner conjunction (PRCLC) notably depends on the surface finish of cylinder liner. This study investigates the mixed lubrication condition near dead centres considering non-Gaussian roughness and cavitation. The non-Gaussian flow factors are incorporated in the average Reynold's equation to include the effect of non-Gaussian roughness. Whereas, the Weibull probability distribution function is employed to model the asymmetry in asperity heights. It is found that surfaces with more negative skewness exhibit lower engine total frictional force in the vicinity of the dead centres. No substantial effect of the skewness and surface roughness is observed in the mid-stroke of the piston. It is shown that PRCLC operates in mixed-EHL regime near the dead centres. The lambda ratio is found to increase with an increase in skewness of the rough surface.

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“…Only two of the papers reviewed sought to do this for a firing engine. One of these 5 included the effects of starvation and bore distortion and predicted a maximum compression-ring film thickness of 4 mm, but reported a measured value of 1.8 mm. The second 6 employed a commercial ring pack lubrication modelling package (which we believe considers starvation and ring-twist) and predicted minimum and maximum compressionring film thicknesses of 0 and 6 mm, in contrast to measurements of 6 and 19 mm.…”

Section: Introductionmentioning

confidence: 99%

Piston-ring film thickness: Theory and experiment compared

Fatjo

Smith

Sherrington

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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A review of the published literature has demonstrated a large variability and discrepancies in the measured and predicted values of piston-ring lubricating film thickness in internal combustion engines. Only 2 papers have been found that compare experiments in firing engines directly with outputs from sophisticated ring-pack lubrication models. The agreement between theory and experiment in these comparisons was limited, possibly because of inadequacies in the models and/ or inaccuracies of measurement. This paper seeks to contribute to the literature by comparing accurately calibrated experimental measurements of piston-ring film thickness in a firing engine with predictions from an advanced, commercial software package alongside details of the systematic analysis of the measurement errors in this process. Suggestions on how measurement accuracy could be further improved are also given. Measurements of oil film thickness with an error (standard deviation) of +/-15% have been achieved. It is shown that this error can be reduced further, by changes in the design and installation of the sensors.Detailed experimental measurements of film thickness under the top compression ring in a firing petrol engine have been made and compared with the predictions from a commercial, state-of-the art modelling package. The agreement between theory and experiment is excellent throughout the stroke in most cases, but some significant differences are observed at the lower load conditions. These differences are as yet unexplained, but may be due to the sensor topography influencing the hydrodynamic lubrication, lubricant availability, out-of-roundness in the cylinder, or squeeze effects. This a topic that requires further study.

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Validation of a Piston Ring-Pack Lubrication Model that Includes Realistic Lubricant Rheology

Cited by 5 publications

References 16 publications

Piston ring–liner lubrication and tribological performance evaluation: A review

Piston ring–liner lubrication and tribological performance evaluation: A review

Research on tribological performance of piston ring/liner conjunction considering non-Gaussian roughness and cavitation

Piston-ring film thickness: Theory and experiment compared

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