Crank angle resolved floating-liner friction measurements on microstructured cylinder liner surfaces

Pasligh, Henning; Oehlert, Karsten; Dinkelacker, Friedrich; Ulmer, Hubertus

doi:10.1007/978-3-658-13255-2_72

Cited by 3 publications

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“…The influence of initially non-circular shaped liner on friction will be investigated in detail with the floating-liner test engine at the University of Hannover where the friction force can be measured directly with crank angle resolution. 23,24…”

Section: Resultsmentioning

confidence: 99%

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

Alshwawra

Pasligh

Hansen

et al. 2019

International Journal of Engine Research

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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.

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Section: Resultsmentioning

confidence: 99%

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

Alshwawra

Pasligh

Hansen

et al. 2019

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…It has to be seen, if such complex shaped liners, i.e., the combination of a conically and elliptically shaped liners, will lead to advantages in real engines. For that, detailed measurements of the crank-angle resolved friction forces are planned in the near future on the single cylinder diesel test engine at the Leibniz University of Hannover [29][30][31].…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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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.

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Machining of Micro Dimples for Friction Reduction in Cylinder Liners

2018

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Crank angle resolved floating-liner friction measurements on microstructured cylinder liner surfaces

Cited by 3 publications

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

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

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

Machining of Micro Dimples for Friction Reduction in Cylinder Liners

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