Experimental investigation of ventilated cavities.
Kinnear, Richard James
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A wedge with a 3.5 inch chord and a half-angle of 4.1 degrees is tested in the MIT Propeller Tunnel. No pulsations were observed on the cavity. Thus, the attempt to verify the theory that pulsations are possible in an infinite medium (without a free surface) is inconclusive. Although there exist a variance in the cavitation number between theory and experiment, the data plotted show that the general shape of the curve for a 4.1 degree wedge is correct. The primary discrepancy is in the pressure recording methods. Visual observations become difficult when ventilated cavities are generated in the test section. It takes only about 5 to 10 seconds for the air introduced into the cavity to recirculate through the tunnel.