Almost 40 Years of Airframe Noise Research: What Did We Achieve?

摘要: IN THE early 1970s the first twin cycle bypass turbofan engines came into service. The development of such engines was triggered by the need to reduce fuel consumption but also had a beneficial side effect on aircraft noise impact through the corresponding reduction in jet noise. In the last decades the bypass ratio of the following generations of turbofan engines was continuously increased. As a result, aircraft engine noise now has come down to a level comparable to that of noise originating from the turbulent flow around the airframe …