The Experts below are selected from a list of 7608 Experts worldwide ranked by ideXlab platform
A E Craft - One of the best experts on this subject based on the ideXlab platform.
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Piston Ring coatings for high horsepower diesel engines
Surface & Coatings Technology, 1993Co-Authors: Freidoon Rastegar, A E CraftAbstract:Abstract Thermal-spray-deposited face coatings were developed for a top compression Piston Ring operating under the high pressures and temperatures of high horsepower diesel engines. Coatings were deposited by plasma spray and high velocity oxygen fuel (HVOF) techniques onto the Piston Ring faces. The coatings were evaluated by wear and engine tests. Three coatings were deposited by a plasma spray technique: molybdenum/chromium carbide, molybdenum/molybdenum carbide, and chromium oxide. Nickel chromium/chromium carbide powder was deposited by a HVOF technique. On the basis of wear and engine testing, HVOF nickel chromium/chromium carbide, plasma-sprayed chromium oxide and plasma-sprayed molybdenum/chromium carbide were identified to have wear resistances superior to that of today's electroplated chromium and molybdenum carbide coatings. Cylinder liner wear was found to be generally equivalent or lower for the thermal spray coatings when compared with the electroplated chromium.
S Held - One of the best experts on this subject based on the ideXlab platform.
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numerical multiphase simulation and validation of the flow in the Piston Ring pack of an internal combustion engine
Tribology International, 2016Co-Authors: A Oliva, S HeldAbstract:Abstract The Piston Ring pack is important for the sealing of the combustion chamber of an internal combustion engine. It plays a major role in friction, wear and oil consumption considerations. Both experimental and theoretical studies in this area are difficult due to the complexity of this highly dynamic system. The paper deals with the numerical investigation by means of computational fluid dynamics of the gas and oil flow in the Piston Ring pack. Having been validated with experimental data, the simulation results show gas and oil transport mechanisms, which can be used to improve existing models of 0D/1D-simulations. This leads to a better understanding of the processes in the Piston Ring pack and helps to further optimize the tribological system.
Tatsumi Kitahara - One of the best experts on this subject based on the ideXlab platform.
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Piston Ring friction in internal combustion engines
Tribology International, 1992Co-Authors: Yutaro Wakuri, Toshiro Hamatake, Mitsuhiro Soejima, Tatsumi KitaharaAbstract:Abstract The tribological phenomena of the sliding surfaces between Piston Rings and cylinder liners may be among the most complex in internal combustion engines, and could become even more severe with an increase of the engine power. The friction between the Piston Rings and the cylinder liner significantly contributes to the mechanical power losses of the engine. The calculations of friction force for a Piston Ring pack are conducted based on hydrodynamic lubrication theory. The oil starvation within the Piston Ring pack is considered in the calculation of oil-film thickness. The friction characteristics of Piston Rings are evaluated with the frictional mean effective pressure. The instantaneous friction force of a Piston assembly under fiRing engine conditions is measured by an improved floating liner method in which the cylinder liner is supported by means of hydrostatic beaRings. The friction characteristics are made clear by analyses and experiments.
Freidoon Rastegar - One of the best experts on this subject based on the ideXlab platform.
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Piston Ring coatings for high horsepower diesel engines
Surface & Coatings Technology, 1993Co-Authors: Freidoon Rastegar, A E CraftAbstract:Abstract Thermal-spray-deposited face coatings were developed for a top compression Piston Ring operating under the high pressures and temperatures of high horsepower diesel engines. Coatings were deposited by plasma spray and high velocity oxygen fuel (HVOF) techniques onto the Piston Ring faces. The coatings were evaluated by wear and engine tests. Three coatings were deposited by a plasma spray technique: molybdenum/chromium carbide, molybdenum/molybdenum carbide, and chromium oxide. Nickel chromium/chromium carbide powder was deposited by a HVOF technique. On the basis of wear and engine testing, HVOF nickel chromium/chromium carbide, plasma-sprayed chromium oxide and plasma-sprayed molybdenum/chromium carbide were identified to have wear resistances superior to that of today's electroplated chromium and molybdenum carbide coatings. Cylinder liner wear was found to be generally equivalent or lower for the thermal spray coatings when compared with the electroplated chromium.
A Oliva - One of the best experts on this subject based on the ideXlab platform.
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numerical multiphase simulation and validation of the flow in the Piston Ring pack of an internal combustion engine
Tribology International, 2016Co-Authors: A Oliva, S HeldAbstract:Abstract The Piston Ring pack is important for the sealing of the combustion chamber of an internal combustion engine. It plays a major role in friction, wear and oil consumption considerations. Both experimental and theoretical studies in this area are difficult due to the complexity of this highly dynamic system. The paper deals with the numerical investigation by means of computational fluid dynamics of the gas and oil flow in the Piston Ring pack. Having been validated with experimental data, the simulation results show gas and oil transport mechanisms, which can be used to improve existing models of 0D/1D-simulations. This leads to a better understanding of the processes in the Piston Ring pack and helps to further optimize the tribological system.
