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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

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

[+] Author and Article Information
Akemi Ito

Mem. ASME
Department of Mechanical Engineering,
Tokyo City University,
1-28-1 Tamazutsumi, Setagaya,
Tokyo 158-8557, Japan
e-mail: aito@tcu.ac.jp

Kazuya Mochiduki

Department of Mechanical Engineering,
Tokyo City University,
1-28-1 Tamazutsumi, Setagaya,
Tokyo 158-8557, Japan
e-mail: kazuya.mochiduki@riken.co.jp

Koji Kikuhara

Mem. ASME
Graduate School of Environment
and Engineering,
Waseda University,
1011 Nishitomita, Honjyo-shi,
Saitama 367-0035, Japan
e-mail: kj.kikuhara@fuji.waseda.jp

Masatsugu Inui

Nissan Motor Co., Ltd.,
6-1 Daikokucho, Tsurumi-ku,
Yokohama-shi,
Kanagawa 230-0053, Japan
e-mail: masatsugu.inui@rntbci.com

Hirotaka Akamatsu

Nissan Motor Co., Ltd.,
6-1 Daikokucho, Tsurumi-ku,
Yokohama-shi,
Kanagawa 230-0053, Japan
e-mail: hirotaka-akamatsu@mail.nissan.co.jp

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 7, 2014; final manuscript received June 3, 2014; published online July 2, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(12), 121503 (Jul 02, 2014) (7 pages) Paper No: GTP-14-1144; doi: 10.1115/1.4027808 History: Received March 07, 2014; Revised June 03, 2014

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.

Copyright © 2014 by ASME
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References

Figures

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Fig. 1

Effect of cylinder roundness on oil consumption (3000 rpm full load, inline 4 cylinder gasoline engine) [4]

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Fig. 2

Schematics of three-piece type oil ring

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Fig. 3

Measurement principle of LIF method [2]

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Fig. 4

Measurement method of oil-film thickness by using LIF method

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Fig. 5

Optical fiber embedded in a sliding surface of the oil ring: (a) photograph of sliding surface and (b) profile of sliding surface

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Fig. 6

Measurement points

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Fig. 7

Schematic of newly developed linkage device

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Fig. 8

Test method for measurement error caused by a change of bending radius of the optical fiber

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Fig. 9

Effect of a change of bending radius of optical fiber on the output for oil-film thickness

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Fig. 10

Calibration curve for oil-film thickness

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Fig. 11

Measurement method for the piston motion

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Fig. 12

Gap sensor used for measurement of piston motion

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Fig. 13

Typical calibration curve of the gap sensor

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Fig. 14

Schematics of rotating piston

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Fig. 15

Cylinder bore shape under the engine operating condition 2000 rpm, full load 3000 rpm, full load

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Fig. 16

Specifications of the tested piston

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Fig. 17

Typical measurement results for oil film thickness of the upper and the lower rail

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Fig. 18

Oil film of an oil ring measured by the optical fiber embedded in the cylinder [13]

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Fig. 19

Measurement results of oil film thickness of the oil ring and lateral and tilting motion of the piston (2000 rpm and 3000 rpm)

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Fig. 20

Assumed effect of piston motion on oil film thickness of upper rail

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