Reduction of Axial Turbomachinery Tonal Noise by Means of Flow Induced Secondary Sources Using an Extremum-Seeking Control Technique
| Autor: | Michael Möser, Rudibert King, R. Becker, Wolfgang Neise, O. Lemke |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Physics
020301 aerospace & aeronautics Acoustics and Ultrasonics Acoustics tonal noise Aerospace Engineering 02 engineering and technology Aerodynamics Sound power 01 natural sciences 010305 fluids & plasmas Amplitude 0203 mechanical engineering Mechanical fan axial turbomachinery 0103 physical sciences Turbomachinery aeroacoustics Loudspeaker Casing Active noise control |
| Zdroj: | International Journal of Aeroacoustics. 6:31-43 |
| ISSN: | 2048-4003 1475-472X |
| DOI: | 10.1260/147547207780440776 |
| Popis: | In conventional active noise control experiments, loudspeakers are used to generate the secondary anti-phase sound field to be superimposed destructively with the sound waves radiated from the primary source. In the present study, aerodynamic sound sources are used to actively control the tonal noise of an axial fan. This is achieved by disturbing the flow field around the blade tips in such a way that additional periodic forces are set up which in turn form the secondary sound sources. To disturb the flow, air is blown into the blade tip region through the casing wall. The resulting aerodynamic sound sources are adjustable in both amplitude and phase. Results for closed loop control of the blade passing frequency using an extremum-seeking control technique are presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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