風洞模型実験による通風の駆動力と室内気流分布の再現性に関する研究

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  • WIND TUNNEL SIMULATION OF CROSS-VENTILATION IN APARTMENT HOUSES
  • フウドウ モケイ ジッケン ニ ヨル ツウフウ ノ クドウリョク ト シツナイ

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Cross-ventilation in apartment houses can be considered as a phenomenon composed of two steps different in scale : the one is outdoor wind inducing ventilation to be taken in scale of a building or a group of buildings and the other, indoor air flow affecting thermal environment of a dwelling unit to be taken in scale of a room or a human body. In this paper authors study on the reproducibility of cross-ventilation in apartment houses by wind tunnel experiment from the standpoint of these two steps. For the first step are applied three kinds of approaching wind different in exponent of power law, using 1/300 scaled model of a part of a housing estate. However, mean speed above the roof of each of buildings in a row was well simulated for all of these three wind profiles. This might be attributed to that these profiles well agree with that of natural wind observed under 20m high, in spite of disagreement in the upper part. Pressure difference at each of the buildings was also well simulated with some exceptions, which are attributed to imperfect reproduction of varying direction of natural wind in the wind tunnel. For the second step are applied three kinds of approaching air flow different in turbulence intensity, using 1/20 scaled dwelling-unit model. The closer simulated turbulence intensity gives the more similar indoor air flow pattern to the field measurements.

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