Drag Reduction Mechanisms Due to Moving Ground and Wheel Rotation in Passenger Cars

  • Elofsson P
  • Bannister M
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There are now several wind tunnel facilities within Europe for testing passenger cars with and without moving ground and rotating wheel conditions (henceforth abbreviated to MVG&RW conditions). Within these facilities, the drag of a car under MVG&RW conditions is typically less than the drag of a car under stationary ground and stationary wheel conditions. This drag difference has been found to vary from a decrease of about 25 drag counts to a small drag increase according to published sources. A drag reduction of 10 to 20 drag counts is more typical, however. Although some of the mechanisms for this drag reduction have been proposed over the last 10 years, a complete list and description of the mechanisms has still not been described. This paper gives descriptions of additional drag mechanisms related to moving ground and rotating wheels. In particular, a mechanism which is often the most important for drag reduction due to MVG&RW is described in detail. In this paper, the drag reduction due to moving ground and rotating wheels has been studied by a break-down of the MVG&RW conditions into: 1. the effect of the ground movement/ground plane conditions 2. the effect of front wheel rotation 3. the effect of rear wheel rotation This

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  • Per Elofsson

  • Mark Bannister

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