Abstract
Design studies of various acoustically treated inlet and fan-exhaust ducts were conducted for the JT3D turbofan engine installation on DC-8 airplanes. These design studies resulted in the selection of two configurations of treated engine inlets and one configuration of treated fan-exhaust ducts for full-scale fabrication and testing. On the basis of ground runup test results, one configuration was chosen for subsequent flyover noise and cruise-performance flight testing. This paper discusses some of the design concepts that were studied, presents some of the results of the full-scale ground runup tests, and also presents predictions of the change in flyover perceived noise level owing to installation of treated nacelles on DC-8–50/61 airplanes.
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