Abstract
It is desirable in many practical situations to design a liner for a duct while maintaining the shape of its cross section intact. When these cross-sectional areas are large, a lot of the acoustical energy could stay unaffected by the wall treatment. Experimental results are presented which indicate that this problem might be remedied by means of an axially nonuniform treatment of the duct. In the case of an exponentially lined duct, some evidence that sound energy would flow away from the center of the duct is obtained. Also included in this paper is a theoretical discussion supporting the possibility of the modal conversion in presence of nonuniform liners. [Work partly supported by NASA Lewis.]
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