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• W2317163627 abstract "Advances in jet technology have pushed towards faster aircraft, leading to more streamlined designs and configurations, pushing engines closer to the aircraft frame. This creates additional noise sources stemming from interactions between the jet flow and surfaces on the aircraft body, as well as interactions between the jet and the ground during takeoff and landing. This paper studies how the presence of a flat plate affects the flow and acoustics in the supersonic jet from a circular C-D nozzle, and how these scale to other nozzle diameters. Comparisons are drawn between baseline cases without a plate and varying nozzle diameters to properly assess the scaling impact of the plate at NPRs of 2.5, 3.0, 3.67, 4.0 and 4.5, and ultimately temperature ratios up to 3.0. At an azimuthal angle of 180° the flat surface causes a shielding effect that mitigates jet mixing noise, and broadband shock-associated noise. Conversely, the sideline position at the azimuthal angle of 90° enhances OASPL magnitudes across all conditions. The study found that plate acoustics scale very well with increasing nozzle diameter, although plate shielding at 180° was the one outlier, causing less dampening of noise across all angles relative to the medium nozzle. Screech tones were not adversely affected by the plate presence, producing significant spikes even at the design condition at an azimuthal angle of 90° (largest spike ~15dB). The frequency of peaks in the upstream and downstream spectra, as well as the frequency of screech tones was matched regardless of nozzle scale. The high screech case, NPR of 3.0, even produces screech for shielded and reflected cases (up to ~30dB), though temperature mitigates these tones across all test conditions. Ultimately these results are compared to a nozzle designed through method of characteristic and a rectangular nozzle of equivalent diameter." @default.
• W2317163627 created "2016-06-24" @default.
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• W2317163627 date "2016-01-02" @default.
• W2317163627 modified "2023-09-25" @default.
• W2317163627 title "Impact of Scale on the Acoustics from a Conical C-D Nozzle Interacting with a Flat Surface" @default.
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• W2317163627 doi "https://doi.org/10.2514/6.2016-1885" @default.
• W2317163627 hasPublicationYear "2016" @default.
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