A Study for Measurement of Oil Film Thickness on Engine Bearing by using Laser Induced Fluorescence (LIF) Method

2003 ◽  
Author(s):  
Kei Nakayama ◽  
Issei Morio ◽  
Takeshi Katagiri ◽  
Yutaka Okamoto
Keyword(s):  
Film Thickness ◽  
Laser Induced Fluorescence ◽  
Oil Film ◽  
Engine Bearing

Influences on the Oil Split Between the Offtakes of an Aero-Engine Bearing Chamber

2012 ◽  
Author(s):  
Wolfram Kurz ◽  
Klaus Dullenkopf ◽  
Hans-Jörg Bauer
Keyword(s):  
Film Thickness ◽  
Test Rig ◽  
Oil Film ◽  
Aero Engine ◽  
The Impact ◽  
Engine Bearing

The aim of the presented work was to identify factors that influence the oil split between the two offtakes of a vented aero-engine bearing chamber. The impact of different vent and scavenge offtake designs was experimentally investigated with a test rig at the ITS. The generic bearing chamber was also equipped with ten film thickness sensors. The film measurements allowed a further evaluation of the mechanisms behind different oil splits. Two of the examined offtake features ensured a very constant oil split: a protruding vent and a covered ramp offtake. The latter also decreased the oil film thickness on the bearing chamber walls significantly. Furthermore, an influence of a non-uniform seal gap was detected which altered the oil split by several percent.

scholarly journals Prediction of Film Thickness of an Aero-Engine Bearing Chamber Using Coupled VOF and Thin Film Model

2019 ◽  
Author(s):  
Kuldeep Singh ◽  
Medhat Sharabi ◽  
Stephen Ambrose ◽  
Carol Eastwick ◽  
Richard Jefferson-Loveday
Keyword(s):  
Thin Film ◽  
Film Thickness ◽  
Air Flow ◽  
Shaft Speed ◽  
Oil Film ◽  
Film Model ◽  
Thin Film Model ◽  
Wide Range ◽  
Aero Engine ◽  
Engine Bearing

Abstract In the present work, a coupled volume-of-fluid (VOF) model with Eulerian thin-film model (ETFM) approach is used to predict the film thickness in an aero-engine bearing chamber. Numerical studies are conducted for a wide range of shaft speeds with lubricant and air flow rates of 100 1/hr and 10 g/s respectively, at a scavenge ratio of 4 on a simplified bearing chamber test rig. Air-flow analysis inside the bearing chamber is also assessed. Primary and secondary airflow predictions are found to be in good agreement with the experimental results. The coupled ETFM+VOF approach is found to be sensitive enough to capture the qualitative trend of oil film formation and distribution over the chamber wall. Oil collection near the sump at a low shaft speed and a rotating oil film at a higher shaft speed are well captured.

On the Continuous Monitoring of Oil-Film Thickness in an Engine Bearing

1978 ◽  
Vol 192 (1) ◽  
pp. 371-376 ◽  
Author(s):  
G. Goodwin ◽  
R. Holmes
Keyword(s):  
Diesel Engine ◽  
Film Thickness ◽  
Continuous Monitoring ◽  
Marine Diesel Engine ◽  
Oil Film ◽  
Numerical Predictions ◽  
Medium Speed ◽  
Marine Diesel ◽  
Signal Conditioning Circuitry ◽  
Engine Bearing

This paper describes research involving the measurement of oil-film thickness in a large end bearing of a medium-sized medium-speed marine diesel engine. The design of the transducer and its novel signal conditioning circuitry is discussed. Comparisons are made between the measured results and numerical predictions.

Quantitative two-dimensional measurement of oil-film thickness by laser-induced fluorescence in a piston-ring model experiment

2016 ◽  
Vol 55 (2) ◽  
pp. 269 ◽  
Author(s):  
Stefan Wigger ◽  
Hans-Jürgen Füßer ◽  
Daniel Fuhrmann ◽  
Christof Schulz ◽  
Sebastian A. Kaiser
Keyword(s):  
Film Thickness ◽  
Model Experiment ◽  
Piston Ring ◽  
Laser Induced Fluorescence ◽  
Two Dimensional ◽  
Oil Film ◽  
Dimensional Measurement ◽  
Ring Model

A Study on Measurement of Conformability of the Piston Oil Ring on the Cylinder Bore Under Engine Operating Condition by Laser Induced Fluorescence Method Using Optical Fiber

2014 ◽  
Vol 136 (12) ◽  
Author(s):  
Akemi Ito ◽  
Kazuya Mochiduki ◽  
Koji Kikuhara ◽  
Masatsugu Inui ◽  
Hirotaka Akamatsu
Keyword(s):  
Optical Fiber ◽  
Film Thickness ◽  
Laser Induced Fluorescence ◽  
Engine Oil ◽  
Sliding Surface ◽  
Ring Groove ◽  
Operating Condition ◽  
Oil Film ◽  
Engine Operating Condition ◽  
Cylinder Bore

It is known that a cylinder-bore shape affects engine oil consumption. This study aimed clarifying the conformability of an oil-ring under engine operating condition. Oil film thickness at the sliding surface of oil-ring rails was measured by laser induced fluorescence (LIF) method using optical fiber embedded in the oil-ring. Findings showed that the piston tilting motion affected oil film thickness. Furthermore, thicker oil film was found at the following rail than that at former rail. It suggested that oil was supplied to the following rail from not only the former ring sliding surface but also somewhere, for example, the oil ring groove.

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