| 摘要 |
<p>A device to manipulate a fluid flow around a towed vehicle 200. The device comprises a deflecting member 830 and an attachment portion, wherein the attachment portion is configured to attach the deflecting member proximate a top surface 260 and/or the upper rear edge 226 of the towed vehicle. The deflecting member is configured to manipulate a position of a portion of the fluid flow such that the expansion of a wake behind the towed vehicle is controlled. The first being a tear drop shaped aerofoil (figure 3). The second being vanes which energise a boundary layer by the use of vortex creating vanes (figure 6 and 7) and the third being a separation trigger, in the form of a ridge, to separate the flow from the rear of the vehicle (figure 9). The first two are used to keep the flow of air attached to the caravan, while it goes around the top rear corner, the third separates the flow from the caravan at a desirable position, and in a way that reduces the wake and therefore the drag.</p> |
