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Characteristics of Unsteady Boundary Layer Induced by the Compression Wave Propagating in a Tunnel

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DOI: 10.4236/ojfd.2012.24A030    4,632 Downloads   6,786 Views  

ABSTRACT

A compression wave is generated ahead of a high-speed train, while entering a tunnel. This compression wave propa- gates to the tunnel exit and spouts out as a micro pressure wave, causing an exploding sound. In order to estimate the magnitude correctly, the mechanism of the attenuation and distortion of a compression wave propagating along a tunnel must be understood and experimental information on these phenomena is required. An experimental and numerical in- vestigation is carried out to clarify the mechanism of the propagating compression wave in a tube. The final objective of our study is to understand the mechanism of the attenuation and distortion of propagating compression waves in a tun- nel. In the present paper, experimental investigations are carried out on the transition of the unsteady boundary layer induced by a propagating compression wave in a model tunnel by means of a developed laser differential interferometry technique.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

T. Tanaka and T. Aoki, "Characteristics of Unsteady Boundary Layer Induced by the Compression Wave Propagating in a Tunnel," Open Journal of Fluid Dynamics, Vol. 2 No. 4A, 2012, pp. 257-263. doi: 10.4236/ojfd.2012.24A030.

References

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