D. Blacodon

Spinning-mode analysis methods are commonly used to study the space-structure of the acoustic field inside ducts. In some applications, the acoustic field is very noisy. The acoustic modes may then be overwhelmed by the spurious modes in the modal spectra. The problem may be solved by methods which greatly reduce the background noise. Four methods studied in a previous work are briefly reminded in this paper. The method which provides the best reduction of the background noise may be inaccurate in certain cases. Indeed, it does not correctly predict the amplitudes of all the acoustic spinning modes. An iterative threshold technique is proposed to eliminate this drawback. It is compared to the four other methods by numerical simulations and by tests in a nozzle of a Turbomeca TM333 turboshaft engine.

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.260-269; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1992