This concept collects the low-energy unsteady flow from under the trailer and redirects it to the center of the base region. Flow exiting between the flaps is directed in the same direction as the outer, high-momentum flow and energizes the trailer wake. The mass and energy addition into the wake reduces the turning required by the side and top flows. The trailer base pressure is increased and the drag is reduced. This technology has undergone extensive road testing. Fuel savings of between 2 to 3 percent were demonstrated in the wind tunnel and road tests. For an in-depth analysis of the road tests of this technology download the SAE technical paper (628kb pdf).
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