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Acoustical Airspeed Indicators


Barish, David Theodore (1950) Acoustical Airspeed Indicators. Engineer's thesis, California Institute of Technology. doi:10.7907/FR7P-K372.


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.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Liepmann, Hans Wolfgang (advisor)
  • Nagamatsu, Henry T. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1950
Record Number:CaltechETD:etd-02022009-083911
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:472
Deposited By: Imported from ETD-db
Deposited On:02 Feb 2009
Last Modified:10 Apr 2023 23:08

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PDF (Barish_dt_1950.pdf) - Final Version
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