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

Leslie W. Lassiter
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.

An Adobe Acrobat (PDF) file of the entire report: