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Sur une expression généralisant le calcul de la puissance acoustique des jets

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The acoustic power of jets measured, as a function of the flow velocity, is compared with the theoretical expression deduced by Lighthill in his theory of aerodynamic noise generation by jets. This comparison shows the limits of validity of Lighthill's calculation.

An expression is proposed which is applicable more generally and differs from the formula of Lighthill by the choice of a variable exponent for the density and of a coefficient of acoustic power, the calculation holding for transonic flow velocities and for the density of hot gases

Sommaire

La puissance acoustique des jets mesurée, en fonction de la vitesse des écoulements, par plusieures équipes indépendantes est comparée avec l'expression théorique déduite par Lighthill de sa théorie de génération de bruit d'origine aérodynamique.

Cette comparaison met en évidence les limites de validité de son calcul.

On propose une expression applicable à l'ensemble des mesures qui diffèere de la formulation de Lighthill par le choix d'un exposant variable pour la densité et d'un coefficient de puissance acoustique déterminé, compte tenu des vitesses transsoniques des écoulements et de la densité des gaz chauds.

Zusammenfassung

Die Schalleistung von Freistrahlen, von mehreren unabhängigen Arbeitsgruppen als Funktion der Strömungsgeschwindigkeit gemessen, wurde mit dem theoretischen Ausdruck verglichen, den Lighthill von seiner Theorie der aerodynamischen Geräuscherzeugung abgeleitet hat.

Dieser Vergleich beweist die begrenzte Gültigkeit seiner Berechnungsmethode.

Es wird ein auf alle Messungen anwendbarer Ausdruck vorgeschlagen, der sich von der Lighthillschen Formulierung durch die Wahl eines variablen Exponenten für die Dichte und einen Koeffizienten der akustischen Leistung unterscheidet und der auch den Überschallbereich und die Dichte heißer Gase berücksichtigt.
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Document Type: Research Article

Publication date: February 1, 1981

More about this publication?
  • 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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