On the interaction of a sound pulse with the shear layer of an axisymmetric jet |
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Authors: | L Maestrello A Bayliss E Turkel |
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Institution: | NASA Langley Research Center, Hampton, Virginia 23665, U.S.A.;Courant Institute of Mathematical Sciences, New York University, New York, U.S.A. |
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Abstract: | The behavior of a sound pulse from a simulated source in a jet is investigated both experimentally and numerically. Both approaches show that in the low and medium frequencies the far field acoustic power exhibits a marked amplification as the flow velocity increases. Experimentally this changes to an attenuation at the higher frequencies which cannot be computed by the numerical model. This amplification is traced to shear noise terms which trigger the instability waves that are inherent within the flow. |
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