抄録
It is hardly possible to visualize the details of turbulent air flow structure with the traditional visualization system. In order to visualize the detailed characteristics of turbulent air flow, the system with laser light sheet is designed. Air flow problems in building environmental engineering, such as turbulent air flow around buildings or dust diffusion in room model are visualized by means of this system. The source of light sheet is Argon ion laser (4 W) which is set on the traversing unit. The high power laser beam is changed into the light sheet by cylindorical lens. Powder of Mg_2CO_3 is used as the particle tracer. The results are as follows. (1) With this system, it is possible to take photographs which clarify the fine structure of vortices in turbulent air flow. (2) It is also possible to visualize the details of dust diffusion process in room model or those of gas diffusion process from the building stack.
