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Improvement of DLR Rotor Aeroacoustic Code (APSIM) and its Validation with Analytic Solution

Yin, J. and Delfs, J. (2003) Improvement of DLR Rotor Aeroacoustic Code (APSIM) and its Validation with Analytic Solution. 29th European Rotorcraft Forum, Friedrichshafen (de), 16.-18.09.2003.

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Abstract

DLR's APSIM code was developed for prediction of rotor or propeller noise radiated in the free far-field. APSIM is the abbreviation for "Aeroacoustic Prediction System based on Integral Method". A new formulation based on airloads as input was derived and implemented in APSIM. The number of revolutions used in the input airloads can now be specified. This characteristic is very important for the tail rotor noise computation as the airloads on the tail rotor may not repeat after one revolution due to main and tail rotor interaction. The aeroacoustic results for the 40% scale BO105 main rotor and tail rotor configuration are calculated using both pressure distribution and airloads from DLR's UPM-Mantic code. The results using different aerodynamic inputs are compared. The implementation of the FW-H formulation based on penetrable surface into DLR's APSIM code is discussed. The aeroacoustic benchmark problems based on a point monopole source in various motions were used to validate the implementation. The comparisons were also made with Kirchhoff formulation. Finally, the effect of an open integral surface on the radiated sound field is discussed and suggestions on the future works are then presented.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Improvement of DLR Rotor Aeroacoustic Code (APSIM) and its Validation with Analytic Solution
Authors:
AuthorsInstitution or Email of Authors
Yin, J.UNSPECIFIED
Delfs, J.UNSPECIFIED
Date:2003
Status:Published
Keywords:Aeroacoustic Prediction, Airload, Integral method, DLR Rotor Aeroacoustic Code (APSIM), DLR UPM-Mantic free wake, aeroacoustic benchmark
Event Title:29th European Rotorcraft Forum, Friedrichshafen (de), 16.-18.09.2003
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Quiet and Comfortable Rotorcraft
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Claudia Grant
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:53

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