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Sur 1'utilisation d'un modèle de sillages pour le calcul du bruit d'interaction Rotor-Stator

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The major part of the noise radiated by some compressor stages or cooling fans is associated with the impingement of the wakes of the rotor blades on the outlet guide vanes. Then the so-called rotor-stator interaction noise depends on geometrical details of the wakes, such as the local wake width and the velocity defect on the wake centre line. These parameters are not commonly accessed by measurement, but they are necessary to compute and explain the noise. They can be inferred from the experimental literature available on the characteristics of wake decay behind a rotor, and by virtue of classical similarity laws. Moreover, the use of an a priori calculation is well-suited for a true prediction method, before the machine is manufactured. Acoustical results will then be reliable only if the wake parameters can be determined with the required degree of precision.

In this paper, the results of a complete calculation of the noise are discussed, for the case of the shrouded tail rotor of an helicopter. The sensitivity of the noise radiated by the outlet guide vanes to variations in the main parameters is examined. It is shown that, for the case of practical interest, only a rough description of the wakes is necessary to obtain good acoustical results.

Zusammenfassung

Dieser Artikel betrifft die Anwendung eines Modells zur Beschreibung des Nachlaufs eines Rotors für die Berechnung des Geräuschs von einem Stator-Diffusor.

Es wird der Einfluß verschiedener Parameter wie der charakteristischen Grö ße und den Abweichungen von der mittleren Nachlaufgeschwindigkeit untersucht, wobei von einer repräsentativen Referenzkonfiguration ausgegangen wird, nämlich der eines ummantelten Hubschrauber-Heckrotors. Das Modell beruht auf den Gesetzen der Nachlaufentwicklung. die der Literatur entnommen wurden.

Es wird gezeigt, daß die ungefähre Kenntnis der Nachlaufschwankungen für eine zuverlässige Vorhersage des Pegels der hauptsächlichen Spektrallinien ausreicht, welche fast die gesamte abgestrahlte Energie enthalten. Das vorgeschlagene Modell erwies sich somit als eine sehr zuverlässige Grundlage für die Vorhersage des von der Rotor-Stator- Wechselwirkung erzeugten Geräuchs.

Résumé

Cet article concerne l'opportunité de l'emploi d'un modèle de description des sillages d'un rotor pour calculer le bruit rayonné par un stator redresseur.

L'influence de différents paramètres, tels que la largeur caractéristique et le défaut de vitesse sur la ligne moyenne des sillages, est analysée, à partir d'une configuration de référence représentative d'un fenestron d'hélicoptere. Le modèle repose sur des lois d'évolution de sillages disponibles dans la littérature.

On montre qu'une connaissance approximative des sillages est suffisante pour prédire avec une bonne stabilité le niveau des premières raies du spectre de bruit, porteuses de presque toute l'énergie rayonnée. Le modèle proposé est done tout à fait fiable d'emploi dans le cadre d'une méthode de prévision du bruit d'interaction rotor-stator.
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Document Type: Research Article

Publication date: 01 May 1994

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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