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Helicopter Rotor Noise Prediction Using ONERA and DLR Euler/Kirchhoff Methods

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Euler/Kirchhoff methods have been developed at ONERA and DLR to predict the High Speed Impulsive (HSI) noise generated by helicopter rotors in hover or in forward night. The main purpose of this common work is to validate and to compare aeroacoustic computations on delocalized test cases. Code to code comparisons show rather close aerodynamic and acoustic predictions. Acoustic results are identical when using the same aerodynamic inputs. In hover, both aerodynamic and acoustic results obtained by each partner are in good agreement with experiment. In forward flight, a first set of computations relative to a non‐rectangular blade rotor model is performed using three different sized grids. Correlation of blade pressure coefficients improve experiment when the grid is refined. However, the capture of the shock waves beyond the blade is not accurate enough to get reasonable noise predictions with respect to the Kirchhoff surface location, whatever the grid refinement may be. In order to improve the aeroacoustic computations in the far‐field, an “adapted“ grid has been generated. Acoustic predictions are clearly improved, showing the requirement for a grid adaptation to perform accurate HSI noise predictions on advanced blade geometries.
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Document Type: Research Article

Affiliations: ONERA, Chaˆtillon, France

Publication date: 01 April 1999

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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