NOISE PRODUCED BY THE INTERACTION OF A ROTOR WAKE WITH A SWEPT STATOR BLADE.

Edmane Envia, Edward J Kerschen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Citations (Scopus)

Abstract

An analysis is developed for the noise generated by the interaction of rotor viscous wakes and a single swept stator vane. The stator vane spans a channel with infinite parallel walls which contains a uniform subsonic mean flow. High frequency wakes, for which the noise generation is concentrated at the vane leading edge, are considered. The general wake pattern is expanded in spanwise modes and solutions for each mode are derived using the Wiener-Hopf technique applied to the equations in the nonorthogonal coordinates. Closed form expressions for the acoustic farfield are obtained. The results of the analysis are used in parametric calculations of rotor viscous wake-stator vane interactions in order to study the effectiveness of sweep as a noise reduction mechanism. For the cases studied, moderate stator sweep angles produce sizeable reductions in the level of the farfield noise. The presence of rotor wake circumferential lean actually increases the noise reduction produced by moderate stator sweep angles.

Original languageEnglish (US)
Title of host publicationAIAA Paper
PublisherAIAA
StatePublished - 1984

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Stators
Turbomachine blades
Rotors
Noise abatement
Acoustics

ASJC Scopus subject areas

  • Engineering(all)

Cite this

NOISE PRODUCED BY THE INTERACTION OF A ROTOR WAKE WITH A SWEPT STATOR BLADE. / Envia, Edmane; Kerschen, Edward J.

AIAA Paper. AIAA, 1984.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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abstract = "An analysis is developed for the noise generated by the interaction of rotor viscous wakes and a single swept stator vane. The stator vane spans a channel with infinite parallel walls which contains a uniform subsonic mean flow. High frequency wakes, for which the noise generation is concentrated at the vane leading edge, are considered. The general wake pattern is expanded in spanwise modes and solutions for each mode are derived using the Wiener-Hopf technique applied to the equations in the nonorthogonal coordinates. Closed form expressions for the acoustic farfield are obtained. The results of the analysis are used in parametric calculations of rotor viscous wake-stator vane interactions in order to study the effectiveness of sweep as a noise reduction mechanism. For the cases studied, moderate stator sweep angles produce sizeable reductions in the level of the farfield noise. The presence of rotor wake circumferential lean actually increases the noise reduction produced by moderate stator sweep angles.",
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