AIRCRAFT NOISE AND ITS SUPPRESSION

Abstract

Apart from the task for which they were conceived, many industrial products generate side effects which are unwanted, but unavoidable. When such effects give rise to public concern, remedies have to be sought in the form of technical solutions that eliminate or minimize the annoyances. The gas turbine aero-engine, conceived as a prime mover for propelling aircraft, needs the Earth's atmosphere for functioning – like man who needs the same atmosphere for living. The environmental effects of the jet engine are noise and exhaust emissions, features that are external to the engine and do not bear directly on the purpose of propelling the aircraft.