Research on the transition phenomena of the attenuation with distance on pressure wave propagating in the long tube
| Project/Area Number |
21560178
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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 | Kyushu University |
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Principal Investigator |
AOKI Toshiyuki 九州大学, 総合理工学研究院, 教授 (20150922)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2009: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 圧縮 / 非圧縮流 / 圧力波 / 非定常境界層 / 遷移現象 / 管路 / トンネル騒音 / 非線形効果 / 距離減衰 / 密度変動 / 波面変形 |
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| Research Abstract |
A compression wave, a shock wave and an expansion wave are generally called a pressure wave. These waves induce rapid pressure fluctuation. In order to control the rapid pressure fluctuation at the time of these pressure waves propagating in a long tube(a pipeline and a tunnel), it is required to get to know correctly attenuation of the strength of the pressure wave and time modification of a wavefront in a propagation process, i. e., the nonlinear phenomenon of propagation and attenuation with distance. In this research, detailed measurement of the changes phenomenon of the unsteady boundary layer about wavefront modification of the pressure wave which propagates in a long tube/tunnel was performed using the detailed experiment which used the laser differential interferometer, and useful data was obtained.
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Report
(4 results)
Research Products
(30 results)
