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Experimental and Numerical Investigation of the Near-Field Wake behind a Transport Aircraft with an Open Ramp

Roosenboom, Eric und Schade, N. und Acisu, I. und Schröder, Andreas (2009) Experimental and Numerical Investigation of the Near-Field Wake behind a Transport Aircraft with an Open Ramp. 4th Symposium on Integrating CFD and Experiments in Aerodynamics, 14-16 September 2009, Sint-Genesius-Rode, Belgium.

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Offizielle URL: http://www.vki.ac.be/icfdex09/

Kurzfassung

The near wake behind a transport airplane model with an open ramp is analyzed in multiple planes utilising stereoscopic and planar PIV as well as numerical RANS calculations. For cargo droppings information on the velocity fluctuations at the ramp is an essential safety requirement. The final PIV results enable a comparison with numerical data. Events in the near-wake observed with PIV and CFD are highlighted. Of particular interest is the evaluation of the capability of turbulence and grid modelling in complex separated flow structures. Five measurement planes were to be measured with PIV, 3 in a 3C-PIV and 2 in a 2C-PIV arrangement. Sample example result of the PIV data are given in figure 1. The set-up of the 3C-PIV and 2C-PIV meas-urement is chosen such that the cameras and laser light sheet for successive planes can be traversed. This en-ables fast calibrations during the measurement. A com-prehensive dataset of PIV results is obtained: for each PIV measurement point 500 image pairs are acquired. The numerical calculations are performed with a hybrid RANS TAU code employing an implicit Backward-Euler with LUSGS-Relaxation for the time discretization and a central method after Jameson for the space discretization. In order to adhere to the flow physics a low dissipative combina-tion of a scalar and matrix dissipation is used. The Spalart-Allmaras one-equation with Edwards-modification is used for the turbulence modelling. An increased resolution of free-stream vortices could be obtained with vortex corrections after FLOWer. A half model was used in the calculations and the grid was generated with Centaur. Especially in the aft region of the fuselage, around the opened ramp, special attention was devoted the grid generation. The total grid size compromised 13.8·10-6 grid points. Numerical calculations have been performed with and without model support.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Experimental and Numerical Investigation of the Near-Field Wake behind a Transport Aircraft with an Open Ramp
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Roosenboom, EricNICHT SPEZIFIZIERT
Schade, N.NICHT SPEZIFIZIERT
Acisu, I.NICHT SPEZIFIZIERT
Schröder, AndreasNICHT SPEZIFIZIERT
Datum:2009
Band:Conference Proceedings
Status:veröffentlicht
Stichwörter:PIV
Veranstaltungstitel:4th Symposium on Integrating CFD and Experiments in Aerodynamics
Veranstaltungsort:Sint-Genesius-Rode, Belgium
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:14-16 September 2009
Veranstalter :VKI
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Transportflugzeuge
Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Institut für Aerodynamik und Strömungstechnik > CASE
Hinterlegt von: Ilka Micknaus
Hinterlegt am:29 Okt 2009 15:03
Letzte Änderung:29 Okt 2009 15:03

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