Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 29, 2018 - November 30, 2018
The effect of pyramid type hood for reducing tunnel micro-pressure waves are experimentally studied. The cross sectional shape of hood is square, and cross-sectional area ratio of hood and tunnel changes 1.27-2.5 in longitudinal direction. The hoods have some adjustable windows. Model experiment is performed for various hood length and opening height h, and the pressure gradient in the tunnel is measured. The experimental result shows that the optimization method of adjusting h can be applied to pyramid type hood. Besides that, if h is optimized, the pressure gradient for pyramid type hood is smaller than that for hoods with constant cross-sectional area.
