Effect of oscillating blade on tonal noise of blade cascade with five NACA 0010 profiles

0557553 - ÚT 2023 CZ eng C - Konferenční příspěvek (zahraniční konf.)
Šnábl, Pavel - Pešek, Luděk - Radolf, Vojtěch - Antoš, Pavel - Procházka, Pavel P. - Prasad, Chandra Shekhar
Effect of oscillating blade on tonal noise of blade cascade with five NACA 0010 profiles.
Engineering mechanics 2022. Book of full texts. Prague: Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, 2022 - (Fischer, C.; Náprstek, J.), s. 377-380. ISBN 978-80-86246-48-2. ISSN 1805-8248. E-ISSN 1805-8256.
[International Conference Engineering mechanics 2022. Milovy (CZ), 09.05.2022-12.05.2022]
Grant CEP: GA ČR(CZ) GA20-26779S
Institucionální podpora: RVO:61388998
Klíčová slova: aeroacoustics * blade cascade * trailing edge noise * tonal noise * NACA 0010
Obor OECD: Applied mechanics
https://www.engmech.cz/improc/2022/377.pdf

The airfoil tonal noise is a well known phenomenon which appears on single airfoils in moderate Reynolds numbers at low angles of attack. It can appear on small aircrafts, fans, wind turbines etc. In thispaper, it was observed on a blade cascade consisting of five NACA 0010 profiles placed in a closed rectangular channel with hard walls when for given conditions, i.e. flow velocity and angle of attack, the cascade tunes to one single frequency. During the middle blade oscillation, the single tone splits up to several tones with lower intensity modulated by the excitation frequency. Thus, the oscillation of one blade suppresses the tonal noise generation in the cascade.
Trvalý link: http://hdl.handle.net/11104/0331679