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Technology Status of Jet Noise Suppression Concepts for Advanced Supersonic Transports

1979; American Institute of Aeronautics and Astronautics; Volume: 16; Issue: 2 Linguagem: Inglês

10.2514/3.58490

1533-3868

William T. Rowe, Eric S. Johnson, Roy A Mckinnon,

Acoustic Wave Phenomena Research

In conducting technology studies for advanced supersonic transports, Douglas Aircraft Company of the McDonnell Douglas Corporation has found that the constraints of community noise dictate the engine cycle selection and nozzle design, and significantly affect the overall airplane configuration design. Since selection and development of an engine is probably the pacing item in any new program start, much activity is underway on definition of engine cycles, provisions for jet exhaust noise suppression, levels of suppression achievable, and the impact of each possible combination on overall airplane performance and technical risk. This paper presents one aircraft manufacturer's views on the technology status of three of the most promising exhaust nozzle designs meeting the noise constraints: the coannular, the coannular with plug, and the retractable mechanical suppressor. Each type is defined along with predicted operational characteristics. Theoretical and actual test performance, for both thrust loss and noise suppression, are summarized. Each of these three nozzles is combined with an appropriate engine, and is sized and integrated into a baseline Mach 2.2 supersonic transport to evaluate range performance. The current status of performance for the various suppression concepts is summarized.