Emploi des ondes ultrasonores pour l'étude d'ure champ aérodynamique
A beam of ultrasonic waves may constitute a process of instantaneous and practical measurement in an aerodynamic field. In the quantitative measurement obtained by the optical methods, the verification of interferograms or striograms is indeed long and intricate. These methods, moreover, do not permit one to separate density gradients met by the same luminous ray in its crossing of the fluid. The detailed study in three dimensions of an aerodynamic field around a model is thereby impossible. We show in the present paper that a narrow bundle of ultrasonic waves (normally directed to the fluid stream of a windtunnel and the luminous beam, and made visible by the optical method of streaks) permits one to measure Mach's number (by determination of the displacement of the beam), permits one furthermore to determine the variation of the fluid temperature (by measuring the wave-length variation) and gives, besides, useful information about the state of the field around a model, of the degree of turbulence, Reynolds' criterion for a cylinder and so on …
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Document Type: Research Article
Publication date: January 1, 1951
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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