Print Email Facebook Twitter Aerodynamic and Aeroacoustic Effects of Swirl Recovery Vanes Length Title Aerodynamic and Aeroacoustic Effects of Swirl Recovery Vanes Length Author Avallone, F. (TU Delft Wind Energy) van den Ende, Luc (Student TU Delft) Li, Q. (TU Delft Flight Performance and Propulsion) Ragni, D. (TU Delft Wind Energy) Casalino, D. (TU Delft Wind Energy) Eitelberg, G. (TU Delft Flight Performance and Propulsion) Veldhuis, L.L.M. (TU Delft Flight Performance and Propulsion) Date 2019 Abstract A numerical investigation of a propeller with swirl recovery vanes, for which experimental data exist, is performed. A second swirl recovery vane geometry, with shorter vanes to avoid the impingement of the propeller tip vortices, is also investigated. For the baseline swirl recovery vanes, the efficiency of the propulsive system increases by 2.4% with respect to the isolated propeller. This is obtained by converting angular momentum in axial momentum. A reduction of the swirl angle in the near wake by 48% is found. Most of the thrust is generated at the root of the vanes. Leading-edge impingement noise is the dominant source. The vanes cause noise to increase by 20 dB with respect to the isolated propeller in the axial direction, where noise from the propeller vanishes. In the axial direction, sound pressure level spectra show tonal peaks at harmonics of the second blade passing frequency, while in the other directions, peaks are present at harmonics of the first blade passing frequency. However, the overall isolated propeller noise is 23 dB higher than the noise generated by the swirl recovery vanes. Shortening the vane length causes a 13% reduction of the thrust generated by the vanes with respect the baseline case but no variation of the far-field noise. To reference this document use: http://resolver.tudelft.nl/uuid:ff8ff3c7-6181-4eaa-83eb-9d2898fcf5a1 DOI https://doi.org/10.2514/1.C035552 Embargo date 2021-12-08 ISSN 0021-8669 Source Journal of Aircraft: devoted to aeronautical science and technology, 56 (6), 2223-2235 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2019 F. Avallone, Luc van den Ende, Q. Li, D. Ragni, D. Casalino, G. Eitelberg, L.L.M. Veldhuis Files PDF Avallone_et_al_2019_SRV.pdf 14.02 MB PDF 1.c035552.pdf 8.99 MB Close viewer /islandora/object/uuid:ff8ff3c7-6181-4eaa-83eb-9d2898fcf5a1/datastream/OBJ1/view