Learning on ScreenAerodynamic Generation of Sound
- Synopsis
- Describes the mechanism of sound generation by turbulence resulting from an instability of steady flow. Elementary source models are illustrated and their fields visualised on a ripple tank. Quadrupoles are discussed and the fundamentals of jet noise generation illustrated in model jet experiments and ripple-tanks simulation. Sound and pseudo-sound are contrasted and experiments show how pseudo-sound energy can be scattered as sound by discrete inhomogenities, such as bubbles in water. The parameter representing source size on a wavelength scale - the compactness ratio. How supersonic flow phenomena can often be attributed to a local break-down of the compactness condition.
- Language
- English
- Country
- United States
- Medium
- Film; Film. 16mm. sd. b&w. 44 min.
- Technical information
- Black-and-white / Sound
- Year of production
- 1968
- Availability
- OUT OF DISTRIBUTION
- Subjects
- Physics
- Keywords
- fluid mechanics; sound
Credits
- Contributor
- John E Flowcs-Williams; M James Lighthill
Distribution Formats
- Type
- Film
- Format
- 16mm
Production Company
- Name
USA
Sponsor
- Name
USA
Distributor
- Name
National Education Video Library
- Contact
- John Lovell
- tryfannevl@aol.com
- Phone
- 01286 676001 or 07768 105467
- Fax
- 01286 676001
- Address
- Arfon House
Bontnewydd
Caernarvon
Gwynned
LL54 7UN - Notes
- Formerly the National Audio Visual (Aids) Library. No longer holds 16mm material. Retains the negatives and copyright to the EFVA material, but have no viewing copies. Video only. (1/97) Alternative address might be Arfon House, Bontnewydd, Caernarvon, Gwynned LL54 7UN Telephone/Fax 01286 676001
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