Science, Space and Technology News 2024
Boundary layer ingesting ducted fan test rig inside the aeroacoustics wind tunnel facility at the University of Bristol. Credit: Feroz Ahmed, reveals for the first time how noise is generated and propagated from these engines, technically known as boundary layer ingesting ducted fans. BLI ducted fans are similar to the large engines found in modern airplanes but are partially embedded into the plane’s main body instead of under the wings.
The research, led by Feroz Ahmed from Bristol’s School of Civil, Aerospace and Design Engineering under the supervision of Professor Mahdi Azarpeyvand, utilized the University National Aeroacoustic Wind Tunnel Facility. They were able to identify distinct noise sources originating from the duct, the rotating fan, and the air flowing over the curved airframe surface.
Projects such as the Bell X-22A, Embraer X, Airbus E-fan, Lilium Jet, Green Jet, and Hybrid Air Vehicle are leading the way in developing these systems for next-generation aircraft. They are becoming more popular due to advancements in powerful electric motors. The researchers designed a BLI test rig featuring an electric ducted fan mounted next to a curved wall, replicating the setup of embedded engines seen in designs like the ONERA NOVA aircraft concept. They collected different types of data from the rig, including measurements of the fan’s thrust output and the amount of noise generated.
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