TY - JOUR

T1 - Enhancing the geometrical performance using initially conical cylinder liner in internal combustion engines-A numerical study

AU - Alshwawra, Ahmad

AU - Pohlmann-Tasche, Florian

AU - Stelljes, Frederik

AU - Dinkelacker, Friedrich

N1 - Funding Information: Funding: A partial fund for this work was provided by the German Jordanian University (GJU) through a research scholarship. German Federal Ministry for Economic Affairs and Energy (BMWi) funded another part within the cooperation project “Energieeffiziente Prozessketten zur Herstellung eines reibungs-, gewichts-und lebendsdaueroptimierten Antriebsstrangs” (Antriebsstrang 2025). The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover.

PY - 2020/6

Y1 - 2020/6

N2 - 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.

AB - 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.

KW - Conical liner

KW - Cylinder liner

KW - Engine design

KW - Finite element method

KW - Gasoline engine

KW - Internal combustion engine

KW - Noncircular liner

KW - Piston ring-cylinder liner conformation

KW - Tapered bore liner

KW - Thermal deformation

UR - http://www.scopus.com/inward/record.url?scp=85086093706&partnerID=8YFLogxK

U2 - 10.3390/app10113705

DO - 10.3390/app10113705

M3 - Article

AN - SCOPUS:85086093706

VL - 10

JO - Applied Sciences (Switzerland)

JF - Applied Sciences (Switzerland)

SN - 2076-3417

IS - 11

M1 - 3705

ER -