| Autor: |
Majd Daroukh, Stéphane Moreau, Nicolas Gourdain, Jean-François Boussuge, Claude Sensiau |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
International Journal of Turbomachinery, Propulsion and Power, Vol 2, Iss 3, p 16 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
2504-186X |
| DOI: |
10.3390/ijtpp2030016 |
| Popis: |
New ultra high bypass ratio architectures may significantly affect the fan tonal noise of future aircraft engines. Indeed, such a noise source is supposed to be dominated by the interaction of fan-blade wakes with outlet guide vanes. However, shorter nacelles in these engines are expected to trigger an important air-inlet distortion that can be responsible for new acoustic sources on the fan blades. Full annulus simulations based on the unsteady Reynolds-averaged Navier–Stokes equations are presently used to study this effect. Simulation results show that the air-inlet distortion has a main effect in the fan-tip region, leading to a strong variation of the fan-blade unsteady loading. It also significantly modifies the shape of the fan-blade wakes and, consequently, the unsteady loading of the outlet guide vanes. Acoustic predictions based on the extension of Goldstein’s analogy to an annular duct in a uniform axial flow are presented and show that the fan sources notably contribute to the fan tonal noise. The air-inlet distortion is responsible for an increase of the noise radiated by both the fan and the outlet guide vane sources, leading to a global noise penalty of up to three decibels. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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