Calculated and Measured Pressure Distributions over the Midspan Section of the NACA 4412 Airfoil (1937)
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from outside the tank that houses the tunnel. The manometer characteristics determined by trial APPARATUS AND TESTS included the time required for the ineniscuses to be- The experimental investigation described herein was come steady and the proper exposure of the photostat made in the… … Figure 2.—Pressure-distribution model mounted in the tunnel. 30-inch glass tubes arranged in a semicircle and con- from - 20° to 30° at a Reynolds Number of approxi- nected at the lower ends to a common reservoir. The total-head pressure of the air stream was chosen as the mately 3,000,000. In…
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