An asymptotic analysis based on the Mach surface structure of the field of a supersonic helical source distribution is applied to predict thickness and loading noise radiated by high-speed propeller blades. The theory utilizes an integral representation of the Ffowcs Williams-Hawkings equation in a fully linearized form. The asymptotic results are used for chordwise strips of the blade, whereas required spanwise integrations are performed numerically. The form of the analysis enables predicted waveforms to be interpreted in terms of Mach surface propagation. A computer code developed to implement the theory is described and foundto yield results in close agreement with more exact computations.
Asymptotic/numerical analysis of supersonic propeller noise
Asymptotische/numerische Analyse vom Propellergeräusch eines Überschallrotorblattes
AIAA Journal ; 29 , 9 ; 1374-1382
1991
9 Seiten, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
Asymptotic Theory of Supersonic Propeller Noise
Online Contents | 1994
|Asymptotic theory of supersonic propeller noise
Tema Archiv | 1994
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