12 室内における流速の水平分布 : 室内通風に関する研究

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タイトル別名
  • 12) HORIZONTAL DISTRIBUTION OF AIR VELOCITY IN A ROOM : Studies on the Cross Ventilation
  • 室内に於ける流速の水平分布
  • シツナイ ニ オケル リュウソク ノ スイヘイ ブンプ

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抄録

This report, one of a series, is limited to fundamental findings from experimental study on air-velocity distribution in a model room due to cross ventilation through windows by natural wind. General view of experimental results is for example as Fig. 4. The basis of air-velocity distribution in a room is the maximum velocity curves. Each of these curves is composed for dominant processes shown in Fig. 5, that is, (1) process of increasing velocity at immediately after inlet. (2) process of constant velocity, or nucleus of jet. (3) process of decreasing velocity after (2). (4) process of increasing velocity at immediately before outlet. In the practical problem, (2) and (3) processes which occupy almost all of the room space are important. These processes in the maximum velocity curves are influenced by dimension and shape of room and openings, or opening ratio (area of outlet/area of inlet), outdoor wind velocity etc. But in this study, experimental results are principally examined from opening ratio and shape of inlet and outlet. By this study which is limited only in case of model room and outdoor wind being constant, it becomes clear that (1) air velocity at nucleus of jet is generally determined by opening ratio, and slightly by shape of inlet and outlet. (2) length of nucleus of jet is propotional to Reynold's number as Fig. 9. It is yet difficult to express condition of decreasing velocity in (3) process by a general formula. But it becomes clear that rate of decreasing velocity depends upon dimension and shape of room and openings, and is approximately in inverse proportion to distance from inlet.

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