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- W2331447400 abstract "When an aircraft takes off and climbs away from the airfield, it flies with a significant angle of attack relative to its direction of motion, so that the jet exhaust from the engine will experience a cross-flow. It is known that a jet in a cross flow will produce noise above that of a jet aligned with the flow. If prediction accuracy is to be improved, the magnitude of the noise changes associated with coaxial jets in a cross flow must be quantified and understood. Accordingly, a series of model-scale tests have been performed to establish noise effects of such cross flow on coaxial jets. A nozzle with bypass diameter 116 mm and a geometry representative of modern high bypass ratio aeroengines was placed at 8° incidence to a cross flow. Noise measurements were made in several azimuthal planes at flow conditions representative of modern aeroengines. The results of these tests are presented: Significant noise increases occurred as a result of the jet being at incidence to the flight-stream. These were observed to vary both with the polar emission angle, and azimuthally around the jet, and also with jet condition. The increases are significantly larger than can be explained by considering the reduced component of the flight velocity in the direction of the jet axis. To progress the understanding of these noise changes, steady-state Computational Fluid Dynamics studies have been carried out to investigate the development of the jet flow and the changes to shear layer turbulence levels as a result of the cross flow. Significant increases in turbulent kinetic energy downstream of the jet nozzle exit were observed in the presence of a cross flow. The results of these studies are presented and discussed in the light of the acoustic test results." @default.
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- W2331447400 date "2003-05-12" @default.
- W2331447400 modified "2023-09-25" @default.
- W2331447400 title "Noise and Flow Studies of Coaxial Jets at Incidence" @default.
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- W2331447400 doi "https://doi.org/10.2514/6.2003-3213" @default.
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