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Water tunnel tests of NACA 4412 and Walchner profile 7 hydrofoils in noncavitating and cavitating flows

Kermeen, Robert W. (1956) Water tunnel tests of NACA 4412 and Walchner profile 7 hydrofoils in noncavitating and cavitating flows. California Institute of Technology , Pasadena, CA. (Unpublished)

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The results of force and cavitation tests on two hydrofoils in two-dimensional flow are presented. The hydrofoils are the NACA 4412 profile and a modified circular arc, flat plate, hydrofoil designated as a Walchner profile 7. The results of experiments performed in wind tunnels and in other water tunnels are presented for comparison. The experiments described in this report are the first tests using the High Speed Water Tunnel two-dimensional working section and the new force balance; therefore, the experimental setup, procedure and methods of data reduction have been described in detail. The results of the tests on the NACA 4412 hydrofoil are in good agreement with those obtained for this profile in the Langley two-dimensional low-turbulence wind tunnel. The results of the tests on the circular arc, flat plate hydrofoil are not in good agreement with the results obtained by Walchner for cavitating flow. The differences in the forces on the hydrofoils can be accounted for with a difference in cavitation number of approximately 0.1. The tests indicate that accurate force measurements can be made with the new water tunnel force balance and that the methods developed during these tests provide a satisfactory means of obtaining the section characteristics of hydrofoils in cavitating and noncavitating flow.

Item Type:Report or Paper (Technical Report)
Additional Information:This research was carried out under the Bureau of Ships Fundamental Hydromechanics Research Program Project NS 715-102, David Taylor Model Basin. Department of the Navy, Bureau of Ships Contract Nonr-220(12). The author wishes to express his appreciation to the many members of the laboratory staff who participated in this experimental investigation. He particularly wishes to thank Dr. B.R. Parkin for his help and advice throughout the investigation, Miss Z.M. Lindberg, and Messrs. R.L. Waid and S.B. Wheeler for their assistance in the test program, Miss Donna Snyder and Mr. E.R. Hoge for preparation of the illustrations and Mrs. Rose Grant for preparing the manuscript.
Group:Hydrodynamics Laboratory
Funding AgencyGrant Number
Department of the Navy, Bureau of ShipsNonr-220(12)
Record Number:CaltechAUTHORS:KERhydrolabrpt47-5
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6014
Deposited By: Archive Administrator
Deposited On:13 Nov 2006
Last Modified:02 Oct 2019 23:28

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