筒状アトリウムの空間温度上昇及び給気開口部風速の簡易予測手法に関する研究

概要

論文の詳細を見る
Temperature rise and ventilation rate caused by a fire in a tall and narrow atrium are successfully estimated by a new model considering physical factors of atrium(floor area, height, opening arrangements), dimensionless heat release rate and Froude number. These two dimensionless numbers are estimated based on inlet-opening width, heat loss to walls, atrium aspect ratio H^2/A and inlet-to-outlet opening ratio. Laboratory measurements of temperature and ascending velocity in flame plume and atrium space, and velocity of flow induced at openings were carried out using a reduced-scale model(1/10) 1.8m×1.8m×7.2m(H) and a gas burner placed at the center of the model generating 1.5kW to 24kW as the arrangements of inlet openings were changed. The laboratory tests validated the figures produced by the model as did the results of previous experiments carried out at various scales and with various opening arrangements and heat release rates under natural and forced ventilation Comparison of the estimated temperature rise and ventilation rate using the model with the results of experiments indicates that the model can be used for estimating these values as a simple tool to evaluate the fire safety design of a tall and narrow atrium.
1994-09-30