押し込み型の煙風洞

抄録

A smoke wind-tunnel, 1, 500mm×200mm×2, 000 mm in the inner dimensions of the test section, has been constructed at the Meiji University. The wind-tunnel enables us not only to observe the flow pattern around the model through the conventional stde-wall window but also to observe upstream by means of another window located at the diffuser section. A cyclone-type diffuser, whch is specially designed for this tunnel, is convenient for the latter observation mentioned above, and is also effective in obtaining a good diffuser performance in a limited space. The thickness of the boundary layer along the inner surface of the test section is minimized by the natural bleed of air from the narrow gap provided along the inlet part of the test section. Characteristics of the tunnel and several examples of flow pattern obtained are described.