| 摘要 |
PROBLEM TO BE SOLVED: To provide a wind tunnel capable of generating an optional period and an optional amplitude of fluctuation in a flow to regenerate a natural environmental condition, and capable of reducing a background noise even when generating the fluctuation, in a wind tunnel facility. SOLUTION: The circulation type wind tunnel is constituted to connect an upstream of a fan to a downstream thereof by one or a plurality of side pipe lines different from a pipe line with a main flow flowing therethrough, and is provided with a mechanism for controlling a numerical aperture of the side pipe lines. COPYRIGHT: (C)2007,JPO&INPIT
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