The Design of Wind Tunnels and Wind Tunnel Propellers (1919)
NASA Technical Reports Server (NTRS) · leaf 15
16 ANNUAL, REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS. these difficulties and to secure as steady a flow as possible in the experimental chamber it is the almost universal practice, in actual tunnels, to make the entrance cone of curving form. It has been found at the Xational Physical… … Fig. 6.—Percentage losses in exit cones of various forms. hood of the sharp edge. To entirely eliminate this edge it is now the practice at the X. P. L. to carry the bell-mouth around, as shown in figure 4. until it meets the straight portion of the tunnel. This method has not been adopted at…
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