Abstract
The experimental investigations presented in this paper deal with an active flow control approach at the rear end of two different three-dimensional generic car configurations. Periodic forcing is used to influence the recirculation area behind these models based on the Ahmed body geometry with slant angles of 25°. and 90°. and hence to achieve a reduction in the total drag. Several forcing parameters (jet angle, forcing frequency and intensity) and their influence on the static pressure distribution at the rear end of the models and the total drag are examined. A model predictive closed-loop actuation approach is presented for one steady blowing excitation configuration. The interaction between the periodic compressed air actuator jet and the shear layer is depicted by means of stereo time-resolved Particle Image Velocimetry. The different actuation concepts lead to a drag reduction of up to 5.7% and demonstrate a good correlation with the static pressure distribution at the rear end of the model.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Hucho, W.H.: Aerodynamik der stumpfen Koerper. Physikalische Grundlagen und Anwendungen in der Praxis. Vieweg (2002)
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)
Lienhart, H., Stoots, C., Becker, S.: Flow and Turbulence Structures in the Wake of a Simplified Car Model (Ahmed Model). In: Wagner, S., Rist, U., Heinemann, H.J., Hilbig, R. (eds.) New Results in Numerical and Experimental Fluid Mechanics III. NNFM, vol. 77, pp. 323–330. Springer, Heidelberg (2002)
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, Heidelberg (2007)
Brunn, A., Nitsche, W.: Active control of turbulent separated flows over slanted surfaces. International Journal of Heat and Fluid Flow 27, 748–755 (2006)
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)
Yunlong, L., Moser, A.: Numerical Modeling of Airflow over the Ahmed Body. In: Proceedings of the 11th Annual Conference of the CFD Society of Canada, pp. 507–512 (2003)
Lienhart, H.: Flow and Turbulence Structure in the Wake of a Simplified Car Model. SAE Technical Paper Series 2003-01-0656, Society of Automotive Engineers, SAE (2003)
Cooper, K.R.: Closed-test-section Wind Tunnel Blockage Corrections for Road Vehicles. Special Publication SAE SP1176, Society of Automotive Engineers, SAE (1996)
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. 241–256. Springer, Heidelberg (2010)
Ljung, L.: System Identification: Theory for the User, 2nd edn. Prentice Hall, Upper Saddle River (1999)
Maciejowski, J.M.: Predictive Control with Constraints. Prentice Hall, Upper Saddle River (2002)
Mayne, D.Q., Rawlings, J.B., Rao, C.V., Scokaert, P.O.M.: Constrained Model Predictive Control: Stability and Optimality. Automatica 36, 789–814 (2000)
Ferreau, H.J., Bock, H.G., Diehl, M.: An Online Active Set Strategy to Overcome the Limitations of Explicit MPC. International Journal of Robust and Nonlinear Control 18, 816–830 (2008)
Henning, L.: Regelung abgeloester Scherschichten durch aktive Beeinflussung. PhD thesis, Technische Universitaet Berlin, Department of Process Engineering (2008)
Englar, R.: Advanced Aerodynamic Devices to Improve the Performance, Economics, Handling and Safety of Heavy Vehicles. SAE Technical Paper Series 2001-01-2072, Society of Automotive Engineers, SAE (2001)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2010 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Krentel, D., Muminovic, R., Brunn, A., Nitsche, W., King, R. (2010). Application of Active Flow Control on Generic 3D Car Models. In: King, R. (eds) Active Flow Control II. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 108. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11735-0_15
Download citation
DOI: https://doi.org/10.1007/978-3-642-11735-0_15
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-11734-3
Online ISBN: 978-3-642-11735-0
eBook Packages: EngineeringEngineering (R0)