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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    4,443 Downloads   6,539 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.

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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