| 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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| 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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