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T placement of a screen across a jet flow results in a substantial noise reduction. This was first observed by Lassiter and Hubbard with further studies initiated by Callaghan and Coles and Coles and North. This study extends the previous work on the subject by attempting to relate the aeroacoustics of the perturbed jet with its turbulent structure. The investigation consisted of three phases: a) a study of various configurations to determine if the effect could be optimized, b) a detailed investigation of the acoustic signal from the best configuration, and c) measurement of the flow characteristics of perturbed and unperturbed jets to determine the mechanism of attenuation. Although this method of suppression • is impractical, a deeper understanding of the basic phenomenon could lead to effective and practical techniques of jet noise attenuation.
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Arndt et al. (1974) studied this question.
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