In a short review covering over fifty years it is only possible to list a few of Alan Powell’ s great achievements, publications and contributions to acoustics, including aeroacoustics and under water acoustics, not to mention other federal research activities, university teaching and serving on or leading numerous committees and panels in both academic and engineering areas. As a corollary in this note it is suggested a further tribute could be made to Alan Powell if his theory of jet shock cell screech could be supplemented by an equally elegant and simple theoretical solution of the characteristics
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R. Westley (2003) studied this question.
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