Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study
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 ar...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/11/3705 |
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| author | Ahmad Alshwawra Florian Pohlmann-Tasche Frederik Stelljes Friedrich Dinkelacker |
| author_facet | Ahmad Alshwawra Florian Pohlmann-Tasche Frederik Stelljes Friedrich Dinkelacker |
| author_sort | Ahmad Alshwawra |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T19:33:41Z |
| format | Article |
| id | doaj.art-65fa30eea6414467aa4385cc7f6766c4 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T19:33:41Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-65fa30eea6414467aa4385cc7f6766c42023-11-20T01:52:41ZengMDPI AGApplied Sciences2076-34172020-05-011011370510.3390/app10113705Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical StudyAhmad Alshwawra0Florian Pohlmann-Tasche1Frederik Stelljes2Friedrich Dinkelacker3Institute for Technical Combustion, Leibniz Universität Hannover, 30823 Garbsen, GermanyInstitute for Technical Combustion, Leibniz Universität Hannover, 30823 Garbsen, GermanyInstitute for Technical Combustion, Leibniz Universität Hannover, 30823 Garbsen, GermanyInstitute for Technical Combustion, Leibniz Universität Hannover, 30823 Garbsen, GermanyReducing 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.https://www.mdpi.com/2076-3417/10/11/3705cylinder linerpiston ring-cylinder liner conformationconical linernoncircular linerthermal deformationinternal combustion engine |
| spellingShingle | Ahmad Alshwawra Florian Pohlmann-Tasche Frederik Stelljes Friedrich Dinkelacker Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study Applied Sciences cylinder liner piston ring-cylinder liner conformation conical liner noncircular liner thermal deformation internal combustion engine |
| title | Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study |
| title_full | Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study |
| title_fullStr | Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study |
| title_full_unstemmed | Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study |
| title_short | Enhancing the Geometrical Performance Using Initially Conical Cylinder Liner in Internal Combustion Engines—A Numerical Study |
| title_sort | enhancing the geometrical performance using initially conical cylinder liner in internal combustion engines a numerical study |
| topic | cylinder liner piston ring-cylinder liner conformation conical liner noncircular liner thermal deformation internal combustion engine |
| url | https://www.mdpi.com/2076-3417/10/11/3705 |
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