Experimental Investigation of the Near Wall Flow Downstream of a Passenger Car Wheel Arch

Paper #:
  • 2018-01-9677

Published:
  • 2018-01-12
Abstract:
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 wheel and wheelhouse and flow from the engine bay and the underbody. In the present paper the near wall flow downstream of the front wheel house is investigated. To visualize the surface pattern a new method is applied, which uses the traditional tuft visualization to capture image series of instantaneous flow patterns and is extended by a digital image processing component to obtain quantitative and time dependent information. Additionally, time resolved surface pressure measurements are reported. The data allows the calculation of the pressure distribution, the standard deviation, cross correlations and a spectral analysis. This paper shows how occurring flow structures propagate over the area studied, by investigating cross correlations of the pressure signal. Additionally, it is possible to estimate their propagation speed. Within this analysis it is found that two main flow phenomena can be observed, one which originates from the flow over the hood and the other due to a separation caused by the wheel-wheelhouse interaction. By investigating the frequency spectrum a dominant Strouhal number of 0.2 is found. A closed wheelhouse configuration is also investigated and the results confirm that it is possible to reduce the fluctuations significantly by separating the external flow from the wheelhouse flow.
Also in:
  • SAE International Journal of Passenger Cars - Mechanical Systems - V127-6EJ
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Standard
1987-02-01