Though slat noise has been known for a long time to be an important component of airframe noise, its prediction remains a very challenging task. For example, slat noise was recognized as a significant contributor to airframe noise by Fink more than 30 years ago. This paper presents a model for aircraft slat noise prediction, based on the theory of aerodynamic sound generation and the first principles of source flow physics. Starting from the theory of acoustic analogy, the noise from the high Reynolds number and low Mach number flows in the slat cove region is formulated as a general solution by the method of dimensional analysis, far-field asymptotic expansion and statistical modeling. The solution relates the far-field noise spectrum to the surface pressure statistics, the characteristic length and time scales in the surface pressure statistics and Green's function that accounts for the sound-flow coupling and propagation effects. The general solution is then used to extract scaling laws and correlation models for the individual functional dependences between the far-field noise and various parameters, including the slat noise spectral shape, its Mach number dependence and its far-field directivity. The simple scaling laws and correlation models are validated by test data and serve as building blocks to construct a slat noise prediction model.
Slat noise modeling and prediction
Journal of Sound and Vibration ; 331 , 15 ; 3567-3586
2012
20 Seiten, 16 Bilder, 3 Tabellen, 22 Quellen
Aufsatz (Zeitschrift)
Englisch
Slat noise modeling and prediction
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