| 摘要 |
PROBLEM TO BE SOLVED: To provide a wind tunnel sound measuring device capable of setting the size of measuring tunnels according to the measuring content, eliminating a useless space and reducing the size and a cost. SOLUTION: Box-shaped auxiliary measuring tunnels 32a to 32d are arranged on at least one surface of upper-lower and left-right surfaces to a box-shaped main measuring tunnel 31 for arranging a object to be tested 15, and an air current shielding plate 33 is arranged on the boundary surface for shielding an air current by passing a sound wave generated from the object to be tested 15. A sound absorbing material 34 is installed on an inside surface of the auxiliary measuring tunnels 32a to 32d. A nozzle 23 is connected to the upstream end in the main measuring tunnel 31, and a diffuser 24 is connected to the downstream end. Tip opening parts of the nozzle 23 and the diffuser 24 are set in the almost same size. The upstream end and the downstream end of the main measuring tunnel 31 have the almost same size as the tip opening parts of the nozzle 23 and the diffuser 24. A sound to the object to be tested 15 is measured in the auxiliary measuring tunnels 32a to 32d.
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