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Acoustic radiation from two-dimensional rectangular cutouts in aerodynamic surfaces / by K. Krishnamurty.
- Format:
- Book
- Government document
- Author/Creator:
- Karamcheti, Krishnamurty, author.
- Series:
- Technical note (United States. National Advisory Committee for Aeronautics) ; 3487.
- Technical notes / National Advisory Committee for Aeronautics ; No. 3487
- Language:
- English
- Subjects (All):
- Aerodynamics.
- Air flow.
- Surfaces (Physics).
- Holes.
- Sound--Measurement.
- Sound.
- Optical interferometers.
- Interferometry.
- Schlieren methods (Optics).
- Hot-wire anemometer.
- aerodynamics.
- Physical Description:
- 1 online resource (33 pages) : illustrations.
- Place of Publication:
- Washington, [D.C.] : National Advisory Committee for Aeronautics, 1955.
- Summary:
- Subsonic and supersonic flow of air past rectangular cavities cut into a flat surface were studied. The cavities were found to emit a strong acoustic radiation. These acoustic fields were investigated by means of schlieren observation, interferometry, and hot-wire anemometer.
- The frequency of the sound, as measured by a hot-wire, at a fixed depth of the gap was found to be inversely proportional to the breadth. No simple relationship was noticed between the Mach number M(infinity) and a nondimensional frequency S based on the gap breadth and the freestream velocity.
- The intensity of the radiation was conveniently measured by means of an optical interferometer of the Mach-Zehnder type. At a Mach number of 0.8, a unit fringe shift was found to correspond to an intensity level of 160 decibels. Fringe shifts equal to and greater than 1 were observed for the radiations from these cavities, indicating that the acoustic fields were very intense.
- Notes:
- Title from title screen (viewed March 7, 2019).
- "August 1955."
- "California Institute of Technology."
- No Federal Depository Library Program (FDLP) item number.
- Includes bibliographical references (page 15).
- Electronic reproduction. Denton, Texas : University of North Texas, 2011 Electronic reproduction from print master produced by University of North Texas
- Other Format:
- Paper version: Karamcheti, Krishnamurty, Acoustic radiation from two-dimensional rectangular cutouts in aerodynamic surfaces
- OCLC:
- 1100474424
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