Tailoring rotor-rotor interactions using blade row spacing for effects of destructive interference

F. Danner, C. Kendall-Torry, H. P. Kau

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations

Abstract

Acoustic emissions of unducted propulsors with counter-rotating blade rows are dominated by sound from unsteady blade row interactions. The intensity as well as phase relation between single interaction events are directly influenced by the axial spacing between the successive rows. The present paper therefore discusses the effects on sound emitted by an advanced unducted propul-sor, which result from a change in blade row spacing. Direct computational aeroacoustics, based on the unsteady Reynolds-averaged Navier-Stokes equations, yield detailed insight into the underlying physics. Analyses of polar directivities, blade surface pressure distributions and propagation characteristics show that the intensity of interactions as well as the associated noise emission are indirectly related to the axial blade row spacing. Moreover, the row spacing is demonstrated to determine the phase relation between potential field induced and advectively transported pressure disturbances reaching the rear rotor. Conclusions are drawn on using the phase to tailor destructive interference for partial noise cancellation.

Original languageEnglish
StatePublished - 2014
Event15th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2014 - Honolulu, United States
Duration: 24 Feb 201428 Feb 2014

Conference

Conference15th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2014
Country/TerritoryUnited States
CityHonolulu
Period24/02/1428/02/14

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