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Handling of Non-Periodic Contra Rotating Open Rotor Data

Akkermans, R.A.D. and Delfs, J.W. and Lummer, M. and Siefert, M and Caruelle, B. and Tiedemann, C. (2012) Handling of Non-Periodic Contra Rotating Open Rotor Data. 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), 04 - 06 June 2012, Colorado Springs, CO, USA.

Full text not available from this repository.

Abstract

In this contribution, we present two different concepts to handle the non-periodic nature of Contra Rotating Open Rotor (CROR) if the front and the aft rotor rotate with a slightly different rotational speed. The first procedure that is presented consists of a correction matrix applied to the source data used in the DLR FWH-code APSIM+. For periodic data the correction matrix reduces to the identity matrix, thereby recovering the standard Fourier transformation. The second method is based on the Vanicek approximation, and consists of a successive least-square approximation of non-periodic data. The developed methods are tested with artificially generated data, illustrating the ability to accurately representing non-periodic data. A comparison between the two methods shows that the first method is more accurate than the Vanicek approximation. Preliminary results on actual non-periodic CROR data reveals the influence of the non-periodic correction as compared to uncorrected data, i.e., differences ranging up to 10 dB are seen for the considered cases.

Item URL in elib:https://elib.dlr.de/78647/
Document Type:Conference or Workshop Item (Speech)
Title:Handling of Non-Periodic Contra Rotating Open Rotor Data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Akkermans, R.A.D.UNSPECIFIEDUNSPECIFIED
Delfs, J.W.UNSPECIFIEDUNSPECIFIED
Lummer, M.UNSPECIFIEDUNSPECIFIED
Siefert, MUNSPECIFIEDUNSPECIFIED
Caruelle, B.AIRBUS Operation S.A.S.UNSPECIFIED
Tiedemann, C.Rolls-Royce Deutschland Ltd. & Co. KGUNSPECIFIED
Date:2012
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Non-periodicity, Contra Rotating Open Rotor
Event Title:18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference)
Event Location:Colorado Springs, CO, USA
Event Type:international Conference
Event Dates:04 - 06 June 2012
Organizer:AIAA/CEAS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Akkermans, Rinie
Deposited On:21 Nov 2012 09:38
Last Modified:08 May 2014 23:28

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