Cavitation Characteristics and Infinite Aspect Ratio Characteristics of a Hydrofoil Section
- Creators
- Daily, James W.
Abstract
This paper describes "two-dimensional" tests in a water tunnel of a profile identical to the 4412 airfoil section of the National Advisory Committee for Aeronautics. The tests included photographic observations of the inception and growth of cavitation as influenced by velocity, pressure (submergence) and angle of attack, and measurements, during cavitation-free operation, of the hydrodynamic forces and moments as functions of Reynolds number and angle of attack. The relation between the angle of attack and the value of the cavitation parameter at which inception occurs is shown for each face of the hydrofoil. The effect of profile geometry in causing cavitation, and the significance of distinct~y different types of cavitation obtained with change in variables are discussed. Convenient curves are given showing the submergence required to avoid cavitation for different velocities and angles of attack. The measured hydrodynamic characteristics are presented in graphical form and are also compared with previously existing data from wind tunnel tests of a finite aspect ratio span. The experimental procedure and its reliability in indicating true infinite aspect ratio characteristics is discussed.
Additional Information
©1949 ASME. Paper No. 521-K-48. This paper presents the results of an investigation conducted at the High Speed Water Tunnel of the Hydrodynamics Laboratory at the California Institute of Technology. The High Speed Water Tunnel was built and operated by the California Institute of Technology under Contract OEMSr-207 with the Office of Scientific Research and Development. Division 6, Section 6.1 of the National Defense Research Committee was the sponsoring agent of the OSRD during the establishment and initial four-year operating period of the Water Tunnel. ·The Hydrodynamics Laboratory and the Water Tunnel research program are under the immediate direction of Robert T. Knapp, Associate Professor of Hydraulic Engineering. These experiments were made as a part of a general program of hydraulic investigations made for the armed services during the period of NDRC sponsorship. This particular investigation was made on request from the United States Navy Department, the David Taylor Model Basin, and on authorization from Dr. E. H. Colpitts, chief of Section 6.1 of the NDRC. The material included here originally appeared in Report No. 6.1-sr207-1273 submitted to the NDRC of the OSRD. In the design of the two-dimensional test installation described here, helpful suggestions were obtained from Professor Theodore von Karman of the California Institute. Mr. Robert E. Carr, who was in charge of the water tunnel test crew, was responsible for execution of actual tests. The excellence of the large quantity of photographic is due to the efforts of Mr. Hugh Stevens Bell of the Water Tunnel staff. Mr. Haskell Shapiro was responsible for the lighting and miscellaneous electronic equipment auxiliary to the experimental set-up.Attached Files
Accepted Version - Cavitation_Characteristics_and_Infinite_Aspect_Ration_Characteristics_of_a_Hydrofoil_Section.pdf
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Additional details
- Eprint ID
- 48701
- Resolver ID
- CaltechAUTHORS:20140819-161732441
- OEMsr-207
- Office of Scientific Research and Development
- National Defense Research Committee
- United States Navy Department
- Created
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2014-08-20Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field