What is it about?
In this paper, an experimental investigation is performed to establish the potential of a zigzag tape as a noise reduction technology for next generation of closely coupled engine-airframe aircraft. A zigzag ring was 3D-printed onto the internal surface of a round nozzle, just upstream of the nozzle exit plane. This ring modifies the properties of the high-speed flow discharged in the ambient, disrupting the mixing and the instability mechanisms that create jet noise.
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Photo by Waldemar Brandt on Unsplash
Why is it important?
Jet noise is one of the dominant noise sources in commercial aircraft take-off. Reducing this noise source is important to comply with aircraft noise regulations, also producing an economic advantave over competitors. The success of ultra-high bypass ratio engines depend on the reduction of the noise produced by the jet-wing interaction, and the zigzag ring has been shown to decrease this noise source in excess of 3 dB. The use of this device in conjunction with other passive and active noise control techniques is promising.
Perspectives
This article is a first attempt at testing trailing edge modified nozzles to reduce installed jet noise. Similar geometries had been tested for isolated jets, but this paper suggests the zigzag tape is more efficient at reducing the strength of the scattered hydrodynamic field of installed configurations. Results are very encouraging and have now paved the way for additional investigations.
Anderson Proenca
Cranfield University
Read the Original
This page is a summary of: Installed jet noise reduction using a zigzag vortex generator, June 2022, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2022-2873.
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