Acoustical Airspeed Indicators

Citation

Barish, David Theodore (1950) Acoustical Airspeed Indicators. Engineer's thesis, California Institute of Technology. doi:10.7907/FR7P-K372. https://resolver.caltech.edu/CaltechETD:etd-02022009-083911

Abstract

Some of the problems associated with the applications of acoustical devices for the determination of airstream characteristics are considered in this study. The velocity and pressure fields for both point sound sources and finite sound sources in both subsonic and supersonic flow are discussed, with a view toward using sound waves for the determination of velocity, Mach number , temperature, and other properties of a flow. The experimental investigations included the measurement of the spectra of ultra-audio-pressure pulsations, both static and total, in the small C.I.T. supersonic tunnel and also in the C.I.T. hypersonic tunnel. A broad range of Mach numbers and a variety of operating conditions were covered. The development of a modified Hartmann sound generator is described, and measurements of the sound field from this device in supersonic flow are included.

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