| Project/Area Number |
62850029
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
機械要素
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| Research Institution | Kyoto University |
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Principal Investigator |
MORI Haruo Faculty of Engineering, Kyoto University, 工学部, 教授 (40025789)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Minoru Faculty of Engineering, Kyoto University, 工学部, 助手 (50026100)
IKEUCHI Ken Faculty of Engineering, Kyoto University, 工学部, 助手 (30026223)
MORI Atunobu Faculty of Engineering, Kyoto University, 工学部, 助教授 (80026202)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1988: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1987: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | Piston Ring / Gas Film Lubrication / 非接触ガスシール |
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| Research Abstract |
New type of a gas lubricated piston ring with orifice compensation is proposed and its performance is analyzed theoretically and experimentally with special attention to the influence of the cut ends. The results obtained are as follows;
1. Computer simulation for variations in the gas film thickness and leak flow reveals that the proposed ring is applicable to an air compressor.
2. Discrete recess downstream of each orifice assures the film thickness profile of geing uniform circumferentially.
3. An elasto-hydrodynamic analysis reveals that the elastic deformation of the ring caused by the cylinder pressure makes the film thickness profile non-uniform circumferentially. the minimum film thickness always locates at the cut ends. This can be reformed by noncircular forming of the ring at the stage of manufaturing.
4. Experimentsl results of the cicumferential film thickness profile differ form predicted ones. This is attributable to the radial and axial errors in the initial shape of the ring. Thus accurate forming of the ring can hold the key of yielding uniform film thickness, though it is very expensive to realize this. One answer for a practical disign may be to allow partial light contacts. It may be a further work to measure the friction force and wear under such a condition.
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