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Alternative Approach in Ground Vehicle Wake Analysis

Lennert Sterken (Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system) ; Lennart Löfdahl (Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system) ; Simone Sebben (Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system) ; Tim Walker
World Academy Of Science, Engineering and Technology Vol. 68 (2012), p. 104-111.
[Konferensbidrag, refereegranskat]

In this paper an alternative visualisation approach of the wake behind different vehicle body shapes with simplified and fully-detailed underbody has been proposed and analysed. This allows for a more clear distinction among the different wake regions. This visualisation is based on a transformation of the cartesian coordinates of a chosen wake plane to polar coordinates, using as filter velocities lower than the freestream. This transformation produces a polar wake plot that enables the division and quantification of the wake in a number of sections. In this paper, local drag has been used to visualise the drag contribution of the flow by the different sections. Visually, a balanced wake can be observed by the concentric behaviour of the polar plots. Alternatively, integration of the local drag of each degree section as a ratio of the total local drag yields a quantifiable approach of the wake uniformity, where different sections contribute equally to the local drag, with the exception of the wheels.

Nyckelord: Local drag, wake, ground vehicle, coordinate transformation



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Denna post skapades 2013-12-11. Senast ändrad 2014-08-11.
CPL Pubid: 188910

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system

Ämnesområden

Transport
Farkostteknik

Chalmers infrastruktur