S0503-1-6 一体型トンネル内煙霧透過率計の開発 : 第2報(トンネルの空気力学、換気、火災(1))

概要

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The existing visibility meter has a measuring distance of I OOm; it has the problem that the absolute value of visibility is not correctly calibrated because the light source and detector are away. Tsuji et al developed an integrated-type visibility meter that has mirrors at both sides to multiple reflection paths. However, it had some problem of a larger temperature dependency. The authors tried to improve the former apparatus; Temperature dependency is improved by introducing bellows at the ends of the cylinder. In order to avoid the measurement delay, we have improved the layout of the inlet/outlet ports by means of numerical simulation. The test model for trial purposes was set up in an actual tunnel, and the comparison experiment with the existing visibility meter is done. As a result, it can obtain temporal resolution almost with the existing.
2009-09-12