Noise from intermittent jet engines and steady-flow jet engines with rough burning

Leslie W. Lassiter
naca-tn-2756
Aug 1952


Sound measurements were made on a pulsejet and a subsonic ramjet of the types used for helicopter rotor drive and on a turbojet with afterburner. The pulsejet was found to produce a discrete-frequency spectrum having a single predominant component corresponding to the engine firing frequency.

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http://naca.central.cranfield.ac.uk/reports/1952/naca-tn-2756.pdf