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Simulation of Transient On-Road Conditions in a Closed Test Section Wind Tunnel using a Wing System with Active Flaps

Wilhelmi, Henning and Jessing, Christoph and Bell, James and Heine, Daniela and Wagner, Andreas and Wiedemann, Jochen and Wagner, Claus (2020) Simulation of Transient On-Road Conditions in a Closed Test Section Wind Tunnel using a Wing System with Active Flaps. SAE International Journal of Passenger Cars - Mechanical Systems, 1 (0688), pp. 2604-2616. Society of Automotive Engineers. doi: 10.4271/2020-01-0688. ISSN 1946-3995.

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Official URL: https://doi.org/10.4271/2020-01-0688


Typical automotive research in wind tunnels is conducted under idealized, stationary, low turbulence flow conditions. This does not necessarily reflect the actual situation in traffic. Thus, there is a considerable interest to simulate the actual flow conditions. Because of this, a system for the simulation of the turbulence intensity I, the integral linear scale L and the transient angle of incidence β measured in full-scale tests in the inflow of a test vehicle was developed and installed in a closed-loop, closed test section wind tunnel. The system consists of four airfoils with movable flaps and is installed in the beginning of the test section. Time-series of the flow velocity vector are measured in the empty test section to analyze the system’s envelope in terms of the turbulence intensity and the integral length scales. It is shown that the length scales in spanwise and in driving (streamwise) direction can be varied from 0.15 m to 7.9 m and from 0.15 m to 2.5 m, respectively, depending on the frequency of the flap movement. The maximum obtained turbulence intensity in the driving direction x is 3% and in the spanwise direction y 9.8%, depending on the flap’s amplitude. It is further shown that the turbulence intensity in driving direction can be increased to 5.6% with passive turbulence generators. Additionally, a model for predicting the flap movement reproducing the transient angle of incidence β measured in the on-road tests during an overtaking maneuver was developed. Measurements of the forces acting on the vehicle revealed an influence of the non-stationary flow on the non-stationary force coefficients. Finally, changes of up to 0.002 in Δcd and 0.157 in Δcs were measured.

Item URL in elib:https://elib.dlr.de/133972/
Document Type:Article
Additional Information:ISSN: 2641-9637 e-ISSN: 2641-9645
Title:Simulation of Transient On-Road Conditions in a Closed Test Section Wind Tunnel using a Wing System with Active Flaps
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wilhelmi, HenningUNSPECIFIEDhttps://orcid.org/0000-0002-0086-287XUNSPECIFIED
Jessing, ChristophUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Bell, JamesUNSPECIFIEDhttps://orcid.org/0000-0001-8319-9817UNSPECIFIED
Heine, DanielaUNSPECIFIEDhttps://orcid.org/0000-0001-7967-5542UNSPECIFIED
Wagner, AndreasUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Wiedemann, JochenUniversität Stuttgart, IVKUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:14 April 2020
Journal or Publication Title:SAE International Journal of Passenger Cars - Mechanical Systems
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2604-2616
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Society of Automotive Engineers
Series Name:SAE International Journal of Passenger Cars—Mechanical Systems
Keywords:Aerodynamik aerodynamics flaps hinterkante instationär instationary non-stationary vehicle Fahrzeug Auto car wind tunnel Windkanal SWG flaps system active flow control aktive Strömungskontrolle Flügelsystem Straßenmessung Versuchsgelände on-road test track
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Wilhelmi, Henning
Deposited On:19 Feb 2020 14:42
Last Modified:27 Oct 2023 14:53

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