Abstract
The aeroacoustics of a boundary layer ingesting (BLI) ducted fan is investigated experimentally. The study examines a ducted fan immersed in an adverse streamwise pressure gradient turbulent boundary layer developed over a curved wall. Aeroacoustics measurements indicate that the noise from the BLI ducted fan results from a complex interaction among the fan, duct and the incoming boundary layer. The fundamental mechanisms of noise generation are explained using a general source separation strategy. A detailed noise comparison is made at varying fan rotational speeds and across a wide range of axial inflow velocities. In a low thrust regime, the noise is found to be driven by the fan loading, coupled with duct acoustics and the haystacking phenomenon. In a high thrust regime, the contribution from duct acoustics diminishes, and the noise is predominantly driven by the fan loading coupled with the haystacking phenomenon.
Original language | English |
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Article number | R1 |
Number of pages | 13 |
Journal | Journal of Fluid Mechanics |
Volume | 985 |
Early online date | 15 Apr 2024 |
DOIs | |
Publication status | Published - 25 Apr 2024 |
Bibliographical note
Publisher Copyright:© 2024 The Author(s). Published by Cambridge University Press.
Keywords
- aeroacoustics
- turbulent boundary layers
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ENODISE: ENabling Optimized DISruptivE Airframe-Propulsion Integration Concepts
Zaman, I. (Student), Azarpeyvand, M. (Principal Investigator) & Zang, B. (Researcher)
Project: Research