| Project/Area Number |
09650213
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Nara National College of Technology |
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Principal Investigator |
KANO Fumikata Nara National College of Technology, Mechanical Engineering, Professor, 機械工学科, 教授 (30280423)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAMOTI Masahiko Nara National College of Technology, Mechanical Engineering, Associate Professor, 機械工学科, 助教授 (00225822)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Centrifugal Compressor / Surging / Pressure Transmitter / Frequency Response |
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| Research Abstract |
The following results were obtained by the study of surge in centrifugal compressor piping system.
1. Completion of Experimental Apparatus
The sensitive semi-conductor pressure transmitter was used to measure the pressure and the temperature without any phase error. For the measurement of the 'fluctuating flow rate, the static pressure of the intake pipe was used to calcurate the flow rate The fluctuating flow rate in the small inlet pipe was measured.
2. Experiment of Surge
The experiment of surge was carried out. The several rotaing speeds of the compressor and the sveral length of the outlet piping were adopted for the experiment, It was found that there was any large phase deference between pressure and flow rate. The relation between pressure and flow rate fluctuation is expressed by the narrow oval locus on the extention of the static compressor characteristic curve.
3. Calcuration of Vibration Frequency
The inner passage of the compressor was converted to the equvalent length of pipe system. The calculation result by the pipe resonace does not meet wjth measurement in case of short pipe length.
But it meets closely with measurement in case of long pipe length. As the result, it seems that the actuation in the compressor to the flow in the pipe is so influential for the vibration frequency.
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