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- W2111405281 abstract "Intermittency of the noise emission has been investigated by means of measurements of instantaneous cross-correlation between the far field acoustic pressure and the velocity component in the jet towards the microphone (pressure signal allowing for the acoustic propagation time). The noise is found to be associated with active periods of the second time derivative of the velocity signal. A conditional sampling procedure with a criterion based on the amplitude of this derivative, has made it possible to show that 50% of the noise is produced during only 10 to 20% of the time. The sections of the jet considered are located between 4 and 10 diameters from the nozzle, a region in which most of the averaged jet noise originates. An attempt to establish a relationship with the large scale structures of the jet has also been made. Examination of various time traces seems to indicate that the noise emission would take place at the upstream side of the large structures where most of the non-turbulent fluid is being caught up and rapidly entrained." @default.
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- W2111405281 date "1980-08-01" @default.
- W2111405281 modified "2023-09-26" @default.
- W2111405281 title "Intermittency of the noise emission in subsonic cold jets" @default.
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- W2111405281 doi "https://doi.org/10.1016/0022-460x(80)90416-2" @default.
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