Curved Beam Based Model for Piston-Ring Designs in Internal Combustion Engines: Working Engine Conditions Study

2018 ◽  
Author(s):  
Mohamed Aziz Bhouri ◽  
Tian Tian
Keyword(s):  
Internal Combustion Engines ◽  
Piston Ring ◽  
Internal Combustion ◽  
Curved Beam ◽  
Combustion Engines

Implementation of an Algorithm to Model the Starved Lubrication of a Piston Ring in Distorted Bores: Prediction of Oil Flow and Onset of Gas Blow-By

1996 ◽  
Vol 210 (1) ◽  
pp. 29-44 ◽  
Author(s):  
M-T Ma ◽  
I Sherrington ◽  
E H Smith
Keyword(s):  
Experimental Evidence ◽  
Internal Combustion Engines ◽  
Piston Ring ◽  
Operating Performance ◽  
Mass Conservation ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Single Ring ◽  
Oil Flow ◽  
Starved Lubrication

Experimental evidence suggests that piston rings in internal combustion engines normally experience 'starved' lubrication at some points along their stroke. To take account of lubricant starvation (and hence move towards a full ring pack analysis), a 'flow continuity algorithm' has been incorporated into a non-axisymmetric lubrication model of a single ring. The algorithm allows both inlet and cavitation boundaries of the full film to be located, making it possible to predict the occurrence of gas blow-by through the ring face, particularly for distorted bores. In addition, oil availability has been determined by applying the principle of mass conservation while considering lubricant accumulation. The computational scheme has been tested extensively and, in consequence, its credibility has been confirmed. Using this approach, a piston ring in a non-circular bore has been studied. The results show that, in general, the operating performance of the ring is influenced significantly by lubricant starvation. In particular, as starvation increases, the conditions that could lead to gas blow-by are greatly enhanced.

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

2017 ◽  
Vol 232 (2) ◽  
pp. 193-209 ◽  
Author(s):  
Cristiana Delprete ◽  
Abbas Razavykia
Keyword(s):  
Internal Combustion Engines ◽  
Piston Ring ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Power Losses ◽  
Oil Consumption ◽  
Major Power ◽  
Power Sources ◽  
Engine Efficiency

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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