This paper presents a new approach to analyzing and developing low-drag cooling systems. A relation is derived which describes cooling drag by a number of contributions. Interference drag clearly can be identified as one of them. Cooling system parameters can be assigned to different terms of the relation, so that differences due to parameter variations of the individual drag contributions can be estimated.In order to predict the interference-drag dependency on the outlet location and the local outlet mass flow, an extensive study on a standard BMW sedan has been carried out, both experimentally and by CFD. The results show the importance of providing consistent outflow conditions which take into account the outlet location and flow direction, in order to minimize cooling drag.
A New Approach to Analyzing Cooling and Interference Drag
Sae International Journal of Passenger Cars. Mechanical Systems
Sae Int. J. Passeng. Cars – Mech. Syst
SAE 2010 World Congress & Exhibition ; 2010
Sae International Journal of Passenger Cars - Mechanical Systems ; 3 , 1 ; 339-351
2010-04-12
13 pages
Conference paper
English
A new approach to analyzing cooling and interference drag
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