Abstract
A method is discussed for controlling the propagation of jet noise from aircraft or power generating plant gas turbines, or other conditions where a high speed stream of fluid is ejected into a quiescent fluid field. Introducing a slower moving heated fluid stream (shield) between an aerodynamic jet and an observer reduces the jet noise reaching the observer. Various kinds of fluid shield are described including flame jets and thermal fluid jets. The physical phenomena involved in fluid shielding are discussed, as well as the mechanisms involved in controlling the generation of sound of fluid jets. Typical experimental results are discussed and the implementation of the concept on an aircraft engine are examined. [Work supported by The Boeing Company, IR&D Program.]
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