7 Flight Mystery and Aerodynamic Principles
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Fig. 7.140 Aircraft aerodynamic noise n distribution (In September 2001, Boeing
conducted a flight test on the full-size B777-200 in Montana, USA, using a free-range
microphone and microphone array to test aerodynamic noise sources in different
states, such as trailing edge flap opening and engine idling.)
Fig. 7.141 Leading edge slat aerodynamic noise
Fig. 7.142 Aerodynamic noise propagation at the leading edge slat