Abstract
The noise emission of a \(9\times 7\) counter-rotating open rotor is examined at different angles of attack. Numerical simulations with acoustic post-processing were carried out with a finite volume code and a Ffowcs Williams and Hawkings tool. The aerodynamic analysis showed a variation of the flow field depending on the angle of attack, leading to additional forces and moments and also an altered noise emission. For the single rotor tones a shift of the emission within the rotor plane is observed, when the flow is attached to the blades. This leads to a higher emission towards the ground and a lower emission towards the sky with positive angles of attack. The trend of the polar emission is qualitatively the same. With flow separation at high angles of attack the polar directivity shows a higher emission in diagonal and \(x\)-direction. The noise emission shows a variation of the noise level and the location of the maxima for the interaction tones depending on the blade-wake and blade-vortex interaction which changes with the spanwise position of the vortex impact.
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Acknowledgments
The authors would like to thank MTU Aero Engines for its support. We also thank the members of the Helicopters and Aeroacoustics group at the IAG for their input and experience.
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Busch, E.R., Keßler, M., Krämer, E. (2014). Computational Aeroacoustics of a Counter-Rotating Open Rotor at Different Angles of Attack. In: Dillmann, A., Heller, G., Krämer, E., Kreplin, HP., Nitsche, W., Rist, U. (eds) New Results in Numerical and Experimental Fluid Mechanics IX. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-319-03158-3_61
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DOI: https://doi.org/10.1007/978-3-319-03158-3_61
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