Experimental Investigation of the Near Wall Flow Downstream of a Passenger Car Wheel Arch
Journal article, 2018

The flow around and downstream of the front wheels of passenger cars is highly complex and characterized by flow structure interactions between the external flow, fluid exiting through the wheelhouse, flow from the engine bay and the underbody. In the present paper the near wall flow downstream of the front wheel house is analyzed, combining two traditional methods. A tuft visualization method is used to obtain the limiting streamline pattern and information about the near wall flow direction. Additionally, time resolved surface pressure measurements are used to study the pressure distribution and the standard deviation. The propagation of the occurring flow structures is investigated by cross correlations of the pressure signal and a spectral analysis provides the characteristic frequencies of the investigated flow. It is found that two main flow phenomena can be observed: one originates from flow exiting the upper wheelhouse and a second one resulting from a separation on the lower wheel house edge. The frequency spectrum reveals a dominant Strouhal number of 0.2. As the observed flow structures are attributed to the wheel-wheelhouse interaction, a closed wheelhouse configuration is also investigated and the results confirm that the fluctuations and observed flow structures are created by the flow interaction between the wheel, wheelhouse and the rotation of the wheel.

Author

Sabine Bonitz

Chalmers, Mechanics and Maritime Sciences, Vehicle Engineering and Autonomous Systems

D. Wieser

Technische Universität Berlin

Alexander Broniewicz

Volvo Cars

Lars Larsson

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Lennart Löfdahl

Chalmers, Mechanics and Maritime Sciences, Vehicle Engineering and Autonomous Systems

Christian Nayeri Navid

Technische Universität Berlin

C. O. Paschereit

Technische Universität Berlin

SAE International Journal of Passenger Cars - Mechanical Systems

1946-3995 (ISSN)

Vol. 11 1

Subject Categories

Geophysical Engineering

Ocean and River Engineering

Fluid Mechanics and Acoustics

DOI

10.4271/06-11-01-0002

More information

Latest update

7/6/2018 3