Characteristics were determined for twin engine jet aircraft having 8-lobe nozzles and ejectors, and unmodified aircraft; in-flight sound pressure levels measured on ground under flight path were reduced 5 to 6 db by suppressors; increases in total drag coefficient of 3 and 7% and decreases in specific range of 5 to 14% were found to result from suppressor.
Ground and in-flight acoustic and performance characteristics of jet-aircraft exhaust noise suppressors
NASA -- Tech Note
1961
50 pages
Report
Englisch
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