Abstract
Active Drag Control using periodic compressed-air jets at the rear end of bluff bodies is one possible measure to reduce the total drag of these models. The dominating drag component of these configurations is the pressure drag resulting from the pressure loss due to the large wake. This study presents an experimental approach on Active Drag Control on an Ahmed body with a slant angle of 90°. The stable periodic vortex structures induced by the slot actuators at the base influence the large recirculation region via a direct (momentum contained in the jet) and an indirect momentum transfer (from the outer flow into the wake). The effectiveness of the actuation strongly depends on the forcing intensity, the forcing frequency and the position of the actuator. For the asymmetric actuation with a cross-wind angle of 15., the optimal forcing parameters change, e. g. higher frequencies are necessary. Time-resolved PIV measurements prove the amplification of turbulent momentum exchange through the actuation.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Ahmed, S.R., Ramm, G.: Some Salient Features of the Time-Averaged Ground Vehicle Wake. SAE Technical Paper Series 840300, Society of Automotive Engineers, SAE (1984)
Beaudoin, J.F., Aider, J.L.: Drag and lift reduction of a 3D bluff body using flaps. Experiments in Fluids 44, 491–501 (2008)
Brunn, A., Nitsche, W.: Active control of turbulent separated flows over slanted surfaces. International Journal of Heat and Fluid Flow 27, 748–755 (2006)
Brunn, A., Wassen, E., Sperber, D., Nitsche, W., Thiele, F.: Active Drag Control for a Generic Car Model. In: King, R. (ed.) Active Flow Control. NNFM, vol. 95, pp. 247–259. Springer (2007)
Cooper, K.R.: Closed-test-section Wind Tunnel Blockage Corrections for Road Vehicles. Special Publication SAE SP1176, Society of Automotive Engineers, SAE (1996)
Hucho, W.H.: Aerodynamik der stumpfen Koerper. Physikalische Grundlagen und Anwendungen in der Praxis. Vieweg (2002)
Krentel, D., Haucke, F., Grund, T., Bauer, M., Hecklau, M., Nitsche, W.: Untersuchungen zur Interaktion gepulster Aktuatorjets mit abgeloesten Scherschichten am Beispiel von Hochauftriebskonfigurationen und einem generischen Fahrzeugmodell mit Hilfe der zeitaufgeloesten Particle Image Velocimetry. In: Lasermethoden in der Stroemungsmesstechnik, 18. Fachtagung (2010)
Krentel, D., Muminovic, R., Brunn, A., Nitsche, W., King, R.: Application of Active Flow Control on Generic 3D Car Models. In: King, R. (ed.) Active Flow Control II. NNFM, vol. 108, pp. 223–239. Springer, Heidelberg (2010)
Rouméas, M., Gilliéron, P., Kourta, A.: Analysis and Control of the Near-wake Flow over a Square-back Geometry. Computers & Fluids 38, 60–70 (2009)
Wassen, E., Eichinger, S., Thiele, F.: Simulation of Active Drag Reduction for a Square-Back Vehicle. In: King, R. (ed.) Active Flow Control II. NNFM, vol. 108, pp. 241–255. Springer, Heidelberg (2010)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Krentel, D., Nitsche, W. (2013). Investigations on Active Drag Control on a Bluff Body with Cross-Wind. In: Dillmann, A., Heller, G., Kreplin, HP., Nitsche, W., Peltzer, I. (eds) New Results in Numerical and Experimental Fluid Mechanics VIII. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 121. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35680-3_22
Download citation
DOI: https://doi.org/10.1007/978-3-642-35680-3_22
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-35679-7
Online ISBN: 978-3-642-35680-3
eBook Packages: EngineeringEngineering (R0)