| 摘要 |
PROBLEM TO BE SOLVED: To prevent deformation and breakage of a straightening member 63 such as a punching metal in a collection tunnel and a model 64 or the like in a measurement chamber 58 by preventing a phenomenon that a pressure in the collection tunnel 56 of a blowout type wind tunnel fluctuates periodically positively and negatively during stop of ventilation measurement. SOLUTION: An opening of a regulator 55 is controlled so that the pressure in the collection tunnel 56 detected by a sensor 71 during the ventilation measurement becomes a pressure P1 for ventilation measurement set by a pressure setting means 72 for ventilation measurement. The opening of the regulator 55 is controlled so that a pressure P2 detected by the sensor 71 during stop of the measurement becomes the atmospheric pressure P0 set by an atmospheric pressure setting means 73. Thereby, during the stop of the measurement, the pressure in the collection tunnel 56 is maintained to the atmospheric pressure. Therefore, the pressure in the collection tunnel 56 does not fluctuate periodically, and the air flows in one direction the same as during the ventilation measurement and without flow back.
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