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• W1981932010 abstract "This experimental study proposes a claw mixer as a jet noise reduction device. The claw, which is composed of sharp-edged parts, i.e., nails, extends from the nozzle end into the jet. It was hypothesized that when the sharp-edged faces of the nails are immersed in the jet plume at an inclined angle relative to the jet axis, the mixing between the jet and surrounding air is improved, leading to a reduction in jet noise. To test this hypothesis, the authors carried out a series of noise tests as a first step. The tests involved a cold-jet test in an anechoic room, a hot-jet test using a model jet engine to simulate heated air, and a largescale test with a turbojet engine in an outdoor environment. The scale-model tests with the hot and cold jets showed the expected noise reduction performance. With increasing penetration of the nail into the plume, the noise benefit in the side direction either decreased or disappeared. The engine noise test, which adopted a relatively deep penetration, resulted in a conventional configuration of noise reduction, with the reduction directivity in the rear direction. Sound source localization supported the far-field noise results, distinguishing the source intensities both with and without the claw mixer. When the thrust was measured simultaneously with the noise, there still remained relatively large thrust penalty compared to the baseline nozzle." @default.
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• W1981932010 date "2012-06-04" @default.
• W1981932010 modified "2023-09-23" @default.
• W1981932010 title "Experimental Study of a Claw Mixer" @default.
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• W1981932010 doi "https://doi.org/10.2514/6.2012-2301" @default.
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