Parametric investigation of the broadband noise due to rotor-stator interaction

Deane, E. and Joseph, P.F. (2008) Parametric investigation of the broadband noise due to rotor-stator interaction. Proceedings of the 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), Vancouver, Canada. 04 - 06 May 2008.

Abstract

This paper presents results derived from a study investigating the rotor wake-OGV interaction source of fan broadband noise. A cascade model is used to perform two parametric studies. The first varies simple aerodynamic and geometric parameters of the wake and cascade. Results of this first study are used to derive correlation equations that allow the prediction of broadband noise levels for variation of these parameters. The second parametric study considers the variation of fan design parameters at different flight conditions; approach, cutback and sideline. Each of these parameters is varied independently while maintaining constant thrust. Results are shown describing the effect on fan broadband noise of variation in pressure ratio, with the results being analyzed by consideration of the variation in wake parameters. Modeled and rig measured spectra are compared. The correlation equations derived during the first parametric study are used to predict the variation in broadband noise for variation in design parameters.

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