J. Böttcher, U. Michel

Flyover noise measurements are evaluated for four different military jet aircraft types flying at low altitudes. Flight Mach numbers ranged from 0.5 to 0.9. The analysis shows that noise immission is likely caused by jet mixing and broadband shock associated noise. Results from novel prediction schemes for both noise sources are compared with the experimental data. It is demonstrated that the schemes describe the observed acoustic signatures quite accurately. This holds for the overall sound pressure level in dependence of the emission angle and for one-third-octave spectra. The prediction schemes are used to demonstrate and quantify the noise reduction potential achievable by varying flight Mach number and flight altitude.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.863-872; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1992