An attempt has been made of the determination of dynamic pressure in the low density wind tunnel by measuring the drag force exerted on a sphere with the wire suspension system and using the drag coefficient of sphere given by the empirical formula. The flow conditions of the present tests are in the Mach number range of 2.0～3.5 and in the Reynolds number range of 50～250 for the length of 1cm. With the same system, the drag forces experienced by ultralightweight models of foamed plastics with circular and square-flat noses have been measured. The effects of the Reynolds number and the shape of model on the drag coefficient have been examined.
吊下げ法による高速希薄気流中の物体の抵抗測定
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