1968-10-07

Some Implications of Noise Restrictions to Subsonic Transport Engine-Installation Design, Development, and Operation 680713

The suppression of noise radiated from turbofan engine installations of commercial transport aircraft has been a subject of continuing research and development studies. This paper discusses some nacelle design approaches being investigated in such studies, and approaches to several problems involved in the development and operation of powerplant installations incorporating noise suppression features. The paper includes some recently obtained theoretical and experimental data on the effects of nacelle configuration on far-field noise distribution and, in addition, several new test techniques for evaluating acoustically absorptive duct-lining durability and cleaning characteristics.

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