This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Direct Calibration of LIF Measurements of the Oil Film Thickness Using the Capacitance Technique
Annotation ability available
Sector:
Language:
English
Abstract
A direct calibration has been performed on laser-induced fluorescence measurements of the oil film in a single cylinder air-cooled research engine by simultaneously measuring the minimum oil film thickness by the capacitance technique. At the minimum oil film thickness the capacitance technique provides an accurate measure of the ring-wall distance, and this value is used as a reference for the photomultiplier voltage, giving a calibration coefficient. This calibration coefficient directly accounts for the effect of temperature on the fluorescent properties of the constituents of the oil which are photoactive. The inability to accurately know the temperature of the oil has limited the utility of off-engine calibration techniques. Data are presented for the engine under motoring conditions at speeds from 800 - 2400 rpm and under varying throttle positions. The resulting calibrated oil film measurements are compared to the statically measured ring profile, to oil film measurements which were calibrated by using the ring profile fitting technique, and to the ring profile obtained from the capacitance data. Under certain conditions significant differences existed between the directly calibrated oil film measurements and those obtained by calibrating with the ring profile fitting, indicating that the true piston ring profile observed under dynamic operation of the engine may be significantly different from that measured statically off the engine. This was confirmed by the data from the capacitance probes. In these situations the lack of a direct calibration can lead to erroneous results.
Recommended Content
Technical Paper | A Multiple Order Conformability Model for Uniform Cross-Section Piston Rings |
Technical Paper | Unsteady Intake Valve Gap Flows |
Technical Paper | Wall Wetting Characterization Using an Image-Based Scattering Technique |
Authors
Citation
Stiyer, M. and Ghandhi, J., "Direct Calibration of LIF Measurements of the Oil Film Thickness Using the Capacitance Technique," SAE Technical Paper 972859, 1997, https://doi.org/10.4271/972859.Also In
References
- Taylor, C. M. “Lubrication Regimes and the Internal Combustion Engine,” Engine Tribology Elsevier Science Publishers 26 75 87 1993
- Ruddy, B. L. Hildyard, M. L. “A Review of Tribological Aspects of Piston Assembly Design,” Vehicle Tribology Elsevier Science Publishers 18 93 102 1991
- Brown, M.A. McCann, H. Thompson, D.M. “Characterization of the Oil Film Behaviour Between the Liner and Piston of a Heavy-Duty Diesel Engine,” SAE Paper No. 932784 1993
- Courtney-Pratt, B.E. Tudor, G.K. “An Analysis of the Lubrication between the Piston Rings and Cylinder Wall of a Running Engine,” Proc. I. Mech. E. 155 293 1946
- Furuhama, S. Sumi, T. “A Dynamic Theory of Piston Ring Lubrication, 3rd. Report: Measurement of Oil Film Thickness,” Bull. JSME 4 774 1961
- Wing, R. D. Saunders, O. “Oil Film Temperature and Thickness Measurements on the Piston Rings of a Diesel Engine,” Proceedings of the Inst. of Mech. Engineers 186 1972
- Lewis, M. G. “A Miniature Mutual Inductance Proximity Transducer,” J. Phys. E. 7 269 1974
- Dow, T. A. Schiele, C. A. Stockwell, R. D. “Technique for Experimental Evaluation of Piston-Cylinder Film Thickness,” Transactions ASME, 82-Lub-42 1982
- Sherrington, I. Smith, E. H. “Experimental Methods for Measuring the Oil-Film Thickness Between the Piston Rings and Cylinder Wall of Internal Combustion Engines,” Tribology International 18 6 315 320 1985
- Grice, N. Sherrington, I. “An Experimental Investigation into the Lubrication of Piston Rings in an Internal Combustion Engine - Oil Film Thickness Trends, Film Stability and Cavitation,” SAE Paper No. 930688 1993
- Smart, A. E. Ford, R. A. J. “Measurement of Thin Liquid Films by a Fluorescence Technique,” Wear 29 41 1974
- Ford, R. A. J. Foord, C. A. “Laser-Based Fluorescence Techniques for Measuring Thin Liquid films,” Wear 51 289 1978
- Hoult, D.P. Lux, J.P. Wong, V.W. Billian, S. A. “Calibration of Laser Fluorescence Measurements of Lubricant Film Thickness in Engines,” SAE Paper No. 881587 1988
- Lux, J. P. Hoult, D. P. Olechowski, M. J. “Lubricant Film Thickness Measurements in a Diesel Engine Piston Ring Zone,” STLE Lubrication Engineering 47 353 1991
- Wong, V. W. Hoult, D. P. “Experimental Survey of Lubricant-Film Characteristics and Oil Consumption in a Small Diesel Engine,” SAE Paper No. 910741 1991
- Brown, M. A. McCann, H. Thompson, D. M. “Characterization of the Oil Film Behaviour Between the Liner and Postin of a Heavy-Duty Diesel Engine,” SAE Paper No. 932784 1993
- Richardson, D.E. Borman, G.L. “Using Fiber Optics and Laser Induced Flourescence for Measuring Thin Oil Films with Application to Engines,” SAE Paper No. 912388 1991
- Richardson, D.E. Borman, G.L. “Theoretical and Experimental Investigations of Oil Films for Application to Piston Ring Lubrication,” SAE Paper No. 922341 1992
- Richardson, D.E. “The Development and Implementation of Theoretical and Experimental Methods for Studying Oil Films in Engine Cylinders,” Department of Mechanical Engineering, University of Wisconsin-Madison 1990
- Shaw B.T., II Hoult, D.P. Wong, V.W. “Development of Engine Lubricant Film Thickness Diagnostics Using Fiber Optics and Laser Fluorescence,” SAE Paper No. 920651 1992
- Phen, R.V. Richardson, D.E. Borman, G.L. “Measurement of Cylinder Liner Oil Film Thickness in a Motored Diesel Engine,” SAE Paper No. 932789 1993
- Phen, R. V. “An Experimental Measurement of Oil Film Thickness On the Liner of a Motored Diesel Engine Using A Laser Induced Fluorescence Technique and Fiber Optics,” Department of Mechanical Engineering, University of Wisconsin-Madison 1992
- Lee, L. “Oil Film Thickness Between Top Piston Ring and Engine Liner Near Ring Reversal of a Single Cylinder S.I. Engine,” Department of Mechanical Engineering, University of Wisconsin-Madison 1995
- Ducu, D. “Calibration of the Laser Induced Fluorescence Technique Applied to Oil Film Thickness Measurements On A Diesel Engine Cylinder Liner By Using Capacitance Gauges,” Department of Mechanical Engineering, University of Wisconsin-Madison 1996
- Stiyer, M. J. “Calibration of the Laser Induced Fluorescence Technique for Measuring Oil Film Thickness at the Ring Reversal Region of a S.I. Engine by using Capacitance Gauges,” Department of Mechanical Engineering, University of Wisconsin-Madison 1996
- Donahue, R. University of Wisconsin-Madison 1997