scholarly journals Experimental Investigation of Friction Coefficient Between Piston Ring-Cylinder Liner of Internal Combustion Engines with Taguchi Method

2018 ◽  
Vol 6 (1) ◽  
pp. 17-25
Author(s):  
Ömer Savaş ◽  
Hüseyin Elçiçek ◽  
Zafer Aydın
Keyword(s):  
Experimental Investigation ◽  
Friction Coefficient ◽  
Taguchi Method ◽  
Internal Combustion Engines ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Combustion Engines

Increasing the roundness of deformed cylinder liner in internal combustion engines by using a non-circular liner profile

2019 ◽  
pp. 146808741989389 ◽  
Author(s):  
Ahmad Alshwawra ◽  
Henning Pasligh ◽  
Hauke Hansen ◽  
Friedrich Dinkelacker
Keyword(s):  
Internal Combustion Engines ◽  
Piston Ring ◽  
Greenhouse Gas Emission ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Mechanical Stresses ◽  
Combustion Engines ◽  
Circular Shape ◽  
Operation Conditions ◽  
Major Interest

Increasing the efficiency of internal combustion engines is of major interest for reduced greenhouse gas emission. A significant improvement potential is given with the reduction of friction losses. Here, especially the friction between the piston ring and the cylinder liner is of interest. This article describes a study with the target to enhance the piston ring–cylinder liner conformation through increasing the roundness of the deformed liner during the warm operation state. The approach is based on the assumption that a non-circular liner in the cold state can deform due to thermal and mechanical stresses toward a circular shape under typical hot operation conditions. To test this hypothesis, a computational model for a gasoline engine was built and simulated using advanced finite element methods. The simulation describes the deformation process of the liner from the thermal and mechanical stresses. First, the deformation of a circular liner is simulated, showing asymmetric deformations of up to 30 µm in the warm state for the cylinder positioned at the end of the four-cylinder bank. As experimental data are readily available, a comparison was possible, showing good agreement. Then, three liner configurations with non-circular shape in the cold stage are investigated. For an elliptically shaped configuration, a nearly circular-shaped liner is reached under typical operation conditions. This numerical approach shows the potential for reduced friction of the piston–liner arrangement within internal combustion engines. The planned next step is the extension of this method to three-dimensional shape aspects and the application to the geometry of our test engine of our lab where friction can be measured in detail with a floating-liner measurement system.

Tribotest of engine piston ring/cylinder liner pairs with different nanoparticles added into engine oil

2018 ◽  
Vol 72 (2) ◽  
pp. 217-231
Author(s):  
Selman Demirtas ◽  
Hakan Kaleli ◽  
Mahdi Khadem ◽  
Dae-eun Kim
Keyword(s):  
Carbon Nanotubes ◽  
Internal Combustion Engines ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Economic Life ◽  
Engine Oil ◽  
Combustion Engines ◽  
Content Type ◽  
Walled Carbon Nanotubes

Purpose Wear on internal combustion engines is a loss of material that occurs with the rubbing of the materials in contact with each other and significantly reduces the economic life of the engine. Even the smallest precaution that can be taken to prevent friction and wear in the engines can provide economical savings in very large quantities. Internal combustion engines are widely utilized in modem automobiles. Around 10 per cent of the total fuel energy is dissipated to heat due to mechanical friction, among which 20 per cent is caused by the contact between the cylinder liner and the piston rings. Design/methodology/approach In this study, real piston ring-cylinder specimens were tested with reciprocating tribometer by using five different nanoparticles added to engine oil to investigate their wear and friction behavior. Findings With regard to the experiments, it has been found that the best results were determined by TiO2 and single-walled carbon nanotubes according to boron nitride, multi-walled carbon nanotubes and graphene nanoparticles added to the engine oil, respectively. At the end of the tests, different wear mechanisms have been determined after the surface analyses on the piston ring and cylinder liner surface, and abrasive wear has been observed as the main wear mechanism. Originality/value This paper has an originality with regard to adding different nanoparticles into the commercial engine oil.

scholarly journals Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study

2020 ◽  
Vol 10 (11) ◽  
pp. 3705
Author(s):  
Ahmad Alshwawra ◽  
Florian Pohlmann-Tasche ◽  
Frederik Stelljes ◽  
Friedrich Dinkelacker
Keyword(s):  
Internal Combustion Engines ◽  
Thermal Stresses ◽  
Numerical Study ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Friction Reduction ◽  
Cylindrical Shape ◽  
Combustion Engines ◽  
Cold State ◽  
The Impact

Reducing friction is an important aspect to increase the efficiency of internal combustion engines (ICE). The majority of frictional losses in engines are related to both the piston skirt and piston ring–cylinder liner (PRCL) arrangement. We studied the enhancement of the conformation of the PRCL arrangement based on the assumption that a suitable conical liner in its cold state may deform into a liner with nearly straight parallel walls in the fired state due to the impact of mechanical and thermal stresses. Combining the initially conical shape with a noncircular cross section will bring the liner even closer to the perfect cylindrical shape in the fired state. Hence, a significant friction reduction can be expected. For the investigation, the numerical method was first developed to simulate the liner deformation with advanced finite element methods. This was validated with given experimental data of the deformation for a gasoline engine in its fired state. In the next step, initially conically and/or elliptically shaped liners were investigated for their deformation between the cold and fired state. It was found that, for liners being both conical and elliptical in their cold state, a significant increase of straightness, parallelism, and roundness was reached in the fired state. The combined elliptical-conical liner led to a reduced straightness error by more than 50% compared to the cylindrical liner. The parallelism error was reduced by 60% to 70% and the roundness error was reduced between 70% and 80% at different liner positions. These numerical results show interesting potential for the friction reduction in the piston-liner arrangement within internal combustion engines.

Cavitation erosion and wear behaviour of a boron cast iron cylinder liner under bio-fuel conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (83) ◽  
pp. 79968-79970 ◽  
Author(s):  
Yufu Xu ◽  
Lulu Yao ◽  
Bin Zhang ◽  
Ka Tang ◽  
Bao Li ◽  
...  
Keyword(s):  
Cast Iron ◽  
Internal Combustion Engines ◽  
Cavitation Erosion ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Wear Behaviour ◽  
Combustion Engines ◽  
Near Future

The use of renewable bio-fuel in internal combustion engines is the trend for the near future.

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.

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