Development of a Measuring System for the Visualization of the Oil Film between the Piston and Cylinder Liner of a Gasoline Engine

Schäffer, Julian; Kirner, Claus; Härtl, Martin; Wachtmeister, Georg

doi:10.4271/03-13-02-0013

Cited by 3 publications

(1 citation statement)

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“…Similar behavior was also observed by Ahling [12] with a different TPOCR design, which also compared the different oil controlling ability between a Twin-Land Oil Control Ring, referred to as TLOCR hereafter, and Three-Piece Oil Control Ring, referred as TPOCR hereafter. Furthermore, Wachtmeister [13] used the similar 2D-LIF technique to investigate oil transport and observed that oil droplets can be transported into the combustion chamber in high speed and low load conditions due to increased inertia force and lowered cylinder pressure.…”

Section: Introductionmentioning

confidence: 99%

Effect of Blowby on the Leakage of the Three-Piece Oil Control Ring and Subsequent Oil Transport in Upper Ring-Pack Regions in Internal Combustion Engines

Tian

2022

Lubricants

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The lubricating oil consumption (LOC) in internal combustion engines contributes to emission and deteriorates the performance of the aftertreatment. In this work, an optical engine with a 2D Laser-induced fluorescence (2D-LIF) system was used to study operating conditions critical to real driving oil emissions. Additionally, numerical models were used to analyze the ring dynamics, oil flow and gas flow. It was found that the intake pressure that results in zero blowby is the separation line between two drastically different oil flow patterns in the ring pack. With intake pressure lower than the separation line, the oil accumulation of the three-piece oil control ring groove (TPOCR) begins to increase, followed by the drastic increase of the oil accumulation in the third land, second land, and finally visible oil leaking through the top ring gap, given enough time. The time required for the oil to leak through different rings was investigated using both measurements and modeling. The effects of drain holes and rail gaps, as well as their relative rotation on oil accumulation and leakage from the TPOCR groove, were analyzed. These findings contribute to improving ring pack designs and engine calibration in spark ignition (SI), gas, and hydrogen engines equipped with TPOCR to minimize the negative impacts of LOC.

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Section: Introductionmentioning

confidence: 99%

Effect of Blowby on the Leakage of the Three-Piece Oil Control Ring and Subsequent Oil Transport in Upper Ring-Pack Regions in Internal Combustion Engines

Tian

2022

Lubricants

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Experimental Identification and Evaluating the Effect of Various Oil Supply Sources on Friction in the Power Unit of a Diesel-Electric Generator Set

Strelnikova,

Putintsev,

Demenkova

2024

Power Technol Eng

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Clarification of Fuel and Oil Flow Behavior Around the Piston Rings of Internal Combustion Engines – Simultaneous analysis of oil flow behavior and oil emissions during transient operation

Stark,

Härtl,

Jaensch

et al. 2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Future demands for modern emission free drivetrains using hydrogen or liquid e-fuels also necessitate a fundamental reduction in oil emissions. Entry of lubrication oil into the combustion chamber can lead to pre-combustion phenomena (LSPI) in downsizing or hydrogen engines and is a cause of particle emissions, which play a significant role especially if fuel related particle emissions are already low. A fundamental understanding of the oil film behavior on the piston assembly and cylinder liner surface are crucial to avoid oil ingress into the combustion chamber. The processes involved take place mainly around the piston group. In particular, the area of the piston rings with the prevailing pressure and temperature conditions as well as the component geometries has a high influence on the exchange of media between the crankcase and combustion chamber.</div><div class="htmlview paragraph">The objective of this paper is to increase the understanding of the processes leading to oil ingress into the combustion chamber. In addition, the resulting oil emissions are to be analyzed and put into perspective. An optical accessible “glass-liner” SI- engine is used as a test bench for simultaneous measurements of the oil film by LIF and the oil emission by mass spectrometry to connect and correlate the information gathered into a more profound understanding of the processes involved and their influence on emission behavior.</div><div class="htmlview paragraph">The focus of this paper lies on transitional behavior from fired to motored operation and back to fired operation. The temporal course of the oil flow and its influence on oil-borne emissions in transient phases could be visualized. A non-deterministic behavior of the oil emissions was observed and validated optically.</div></div>

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Development of a Measuring System for the Visualization of the Oil Film between the Piston and Cylinder Liner of a Gasoline Engine

Cited by 3 publications

References 0 publications

Effect of Blowby on the Leakage of the Three-Piece Oil Control Ring and Subsequent Oil Transport in Upper Ring-Pack Regions in Internal Combustion Engines

Effect of Blowby on the Leakage of the Three-Piece Oil Control Ring and Subsequent Oil Transport in Upper Ring-Pack Regions in Internal Combustion Engines

Experimental Identification and Evaluating the Effect of Various Oil Supply Sources on Friction in the Power Unit of a Diesel-Electric Generator Set

Clarification of Fuel and Oil Flow Behavior Around the Piston Rings of Internal Combustion Engines – Simultaneous analysis of oil flow behavior and oil emissions during transient operation

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