Research Papers: Internal Combustion Engines

Continuous Lubricant Film Thickness Measurement Between Piston Ring and Cylinder Bore

[+] Author and Article Information
Yunus Emre Ayranci

Mechanical Engineering Department,
Istanbul Technical University,
Gumussuyu, Istanbul 34437, Turkey

Ozgen Akalin

Mechanical Engineering Department,
Istanbul Technical University,
Gumussuyu, Istanbul 34437, Turkey
e-mail: akalin@itu.edu.tr

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 19, 2017; final manuscript received November 8, 2017; published online April 20, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(7), 072802 (Apr 20, 2018) (9 pages) Paper No: GTP-17-1569; doi: 10.1115/1.4038818 History: Received October 19, 2017; Revised November 08, 2017

Measurement of film thickness between piston ring and cylinder bore has been a challenge for decades; laser-induced fluorescence (LIF) method was used by several groups, and promising results are obtained for the investigation of lubricant film transport. In this study, blue light generated by a laser source is transmitted to a beam splitter by means of a fiber optic cable and combined with another fiber optic line, then transmitted to the piston ring and cylinder bore conjunction. The light causes the fluorescence dye present in the lubricant to emit light in a longer wavelength, i.e., green. Reflected light is recollected; blue wavelength components are filtered out using a narrow band pass optical filter, and only components in the florescence wavelength is transmitted to a photomultiplier tube. The photomultiplier produces a voltage proportional to instantaneous lubricant film thickness. Then, the photomultiplier signal is calibrated for lubricant film thickness using a laser textured cylinder bore with known geometries. Additional marks were etched on the liner for calibration. The LIF system is adapted to a piston ring and cylinder bore friction test system simulating engine conditions. Static piston ring and reciprocating liner configuration of the bench test system allow the collection of continuous lubricant film thickness data as a function of crank angle position. The developed system has potential to evaluate new designs, materials, and surface properties in a controlled and repeatable environment.

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Fig. 4

Fiber optic access locations on the piston ring

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Fig. 5

Microscope evaluation of the fiber optic access windows on the piston ring

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Fig. 6

Laser-induced fluorescence system diagram

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Fig. 7

Etched calibration liner segment

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Fig. 8

Optical profiler measurement of a laser honed dimple

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Fig. 9

Surface profiler measurement of an etched mark

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Fig. 10

Laser-induced fluorescence system measured etched mark profile shown in Fig. 9

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Fig. 11

Laser-induced fluorescence calibration

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Fig. 13

Friction coefficient and film thickness (standard)

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Fig. 14

Friction coefficient and film thickness (700 rpm)

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Fig. 15

Friction coefficient and film thickness (30 °C)

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Fig. 16

Friction coefficient and film thickness (50 °C)

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Fig. 12

Friction coefficient and film thickness (300 rpm)

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Fig. 3

Fluorescence spectrum (Coumarin 540 A)

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Fig. 2

Fluorescence spectrum (Coumarin 523)

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Fig. 17

Friction coefficient and film thickness (240 N)



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