An experimental investigation was conducted in an anechoic flow facility to explore problems and methods of measuring the airframe (nonpropulsive) noise associated with a 1/20-scale model of a B-737 transport. The test model geometry simulated the cruise and a landing configuration. Nonpropulsive model noise was detected at various flow velocities and at various angles of attack when turbulent flow was induced over the model. Discrete tones, associated with the extended undercarriage and wheel cavities, and an increase in broadband sound pressure level were observed with the model in a landing configuration.
Airframe noise measurements on a transport model in a quiet flow facility
American Institute of Aeronautics and Astronautics, Aero-Acoustics Conference ; 1975 ; Hampton, VA
1975-03-01
Conference paper
No indication
English