Název:
Effect of oscillating blade on tonal noise of blade cascade with five NACA 0010 profiles
Autoři:
Šnábl, Pavel ; Pešek, Luděk ; Radolf, Vojtěch ; Antoš, Pavel ; Procházka, Pavel P. ; Prasad, Chandra Shekhar Typ dokumentu: Příspěvky z konference Konference/Akce: International Conference Engineering mechanics 2022, Milovy (CZ), 20220509
Rok:
2022
Jazyk:
eng
Abstrakt: 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.
Klíčová slova:
aeroacoustics; blade cascade; NACA 0010; tonal noise; trailing edge noise Číslo projektu: GA20-26779S (CEP) Poskytovatel projektu: GA ČR Zdrojový dokument: Engineering mechanics 2022. Book of full texts, ISBN 978-80-86246-48-2, ISSN 1805-8248