Analysis of Aluminum and Steel Pistons—Comparison of Friction, Piston Temperature, and Combustion

Schreer, Kai; Roth, Ingo; Schneider, Simon; Ehnis, Holger

doi:10.1115/1.4027275

Cited by 19 publications

(9 citation statements)

References 1 publication

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“…Both of these trends are consistent with the experimental data. Note here that the increase in energy transferred to the oil with the steel piston (Figures 4 to 7 inclusive) observed in the current work is contrary to previously reported studies within the literature [14,15]. The authors attribute this apparent disagreement to differences in piston cooling arrangements between the current study and the referenced works.…”

Section: = − ( + ) (3)contrasting

confidence: 99%

“…Thus, the reduced energy transfer to the coolant in the jacket-for all operating conditions and EGR rates-when operating with the steel piston is consistent with the reduced frictional losses associated with the design as shown in Figure 8. It is also consistent with the expected effects of the reduced skirt length and longer con-rod length associated with the steel piston, and in full agreement with the literature [14,15]. It should be recognized however that the energy transfer to coolant in the jacket is also affected by heat conduction through the piston ring pack and that the observed changes may not be due to frictional effects alone.…”

Section: = − ( + ) (3)supporting

confidence: 89%

“…Recently, steel pistons have found their way into light-duty diesel applications, and apart from their structural benefits over the aluminium pistons, researchers have reported improvements in both brake and indicated fuel efficiency [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

Papaioannou¹,

Leach²,

Davy³

2019

SAE Technical Paper Series

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Chromium-molybdenum alloy steel pistons, which have been used in commercial vehicle applications for some time, have more recently been proposed as a means of improving thermal efficiency in lightduty applications. This work reports a comparison of the effects of geometrically similar aluminium and steel pistons on the combustion characteristics and energy flows on a single cylinder high-speed direct injection diesel research engine tested at two speed / load conditions (1500 rpm / 6.9 bar nIMEP and 2000 rpm / 25.8 bar nIMEP) both with and without EGR. The results indicate that changing to an alloy steel piston can provide a significant benefit in brake thermal efficiency at part-load and a reduced (but nonnegligible) benefit at the high-load condition and also a reduction in fuel consumption. These benefits were attributed primarily to a reduction in friction losses. In terms of energy transfer, switching to the steel piston design was shown to reduce heat transfer to the coolant, consistent with lower friction work and reduced conduction through the ring pack, and increase the energy transfer to the oil. Piston blowby was also greatly reduced. Ignition delay times and overall combustion durations were reduced with the steel piston design, possibly indicative of higher piston surface temperatures.

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Section: = − ( + ) (3)contrasting

confidence: 99%

Section: = − ( + ) (3)supporting

confidence: 89%

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Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

Papaioannou¹,

Leach²,

Davy³

2019

SAE Technical Paper Series

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“…This was evaluated by heating the coated parts in the air in a box furnace. Samples were heated at 30 C/min up to temperatures of both 300 C and 400 C [28] and were maintained at this temperature for 120 minutes before cooling. The anti-stick properties of the coated parts to carbon buildup were evaluated by applying a drop of heavyduty engine oil (Castrol GTX Diesel, 15W{40) onto the surface of the coatings.…”

Section: Methodsmentioning

confidence: 99%

Deposition of anti-stick coatings to prevent hydrocarbon buildup on truck engines

Awais

2020

Scientia Iranica

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The deposition of hydrocarbon buildup on truck engine surfaces may reduce fuel e ciency and the increasing amount of unburned fuel as exhaust gases can lead to environmental hazard. This problematic issue can be resolved by applying anti-stick coatings to engine pistons using Physical Vapor Deposition (PVD) technique. This study investigates a broad range of coating substrate systems including chrome based (CrN, CrAlTiN), oxides (TiOx and ZrOx), carbon based (Graphit-iC TM and Dymon-iC TM), and special coating (TiB 2) substrate systems to determine their ability to act as anti-stick coatings. All the coatings investigated in this study were applied to polished parts cut from engine piston cylinders. Characterizations were performed after applying droplets of engine oil and heat treating the surfaces up to 400 C. Based on the evaluation of oil adhesion, surface energy, coating thermal stability, surface morphology, and mechanical and crystallographic properties, the anti-stick performance ranking of coatings was suggested for truck engine piston applications in order to improve their performance.

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“…Many studies are engaged in modeling the thermal stress and strain state of a piston (Abramchuk and Avramenko, 2009;Agarwal and Varghese, 2006;Dallwoo et al, 2012;Rahmani et al, 2017;Barbieri et al, 2017;Zhao et al, 2014;Lu et al, 2017;Schreer et al, 2014;Finol and Robinson, 2006). To increase the accuracy and information content of modeling results, they recommend considering groups of parts to account for joint thermomechanical deformation.…”

Section: Introductionmentioning

confidence: 99%

Prospects of Using Steel Pistons in Transport Diesel Engines

Абрамчук

Авраменко

2019

Period. Polytech. Transp. Eng.

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The results of comparative design research in the thermal stress and strain state of the piston in transport diesel engine 2 F 10.5/12 are given for its rated power operation. The standard piston is made of an aluminium alloy, and the modernized one, of steel. Piston thermal profiling and indicator test results were used for identifying the mathematical models and refining the boundary conditions for mechanics and heat conduction problems. To ensure reliable heat rejection from the piston, the paper considered the case of oil jet cooling. This was taken into account when describing the boundary conditions of the heat conduction problem. The thin-wall steel piston with oil jet cooling was shown to function reliably under the study conditions. The temperature in the first compression ring groove does not exceed 200 °С, and the radial deformation of the piston crown is less than half of that of an aluminium alloy standard piston.

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Analysis of Aluminum and Steel Pistons—Comparison of Friction, Piston Temperature, and Combustion

Cited by 19 publications

References 1 publication

Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

Thermal Analysis of Steel and Aluminium Pistons for an HSDI Diesel Engine

Deposition of anti-stick coatings to prevent hydrocarbon buildup on truck engines

Prospects of Using Steel Pistons in Transport Diesel Engines

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