Tham khảo tài liệu 'advanced vehicle technology 2 episode 17', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Centre line and offset double gap seal vortex stabilizer Fig. a and b A central vertical partition or alternatively a pair of offset flexible vertical plates attached to the trailer body see Fig. a and b is effective in not only preventing crosswinds passing through the cab to trailer gap but also stabilizes the air flow entering the gap by generating a relatively stable vortex on either side of the plate or plates. The vortex stabilizer is slightly less effective than the extended side panel method in reducing the drag coefficient when side winds prevail. Rolled edge windcheater Fig. a-d This device consists of an extended quadrant section moulding attached to the roof and both sides of the leading edges of the forebody trailer panel. When there are sharp leading edges around the trailer body air flowing through the cab to trailer space tends to overshoot and hence initially separate from the side panels of the trailer body see Fig. a and even with rounded edging there is still some overshoot and flow separation Fig. b . The effectiveness of different sectioned forebody edge fairings are compared corresponding to a yaw angle relative wide angle variation from 0 to 20 see Fig. d . Here it can be seen that there is very little difference between the semi circular and elongated semi circular moulding but there is a moderate improvement in the drag coefficient at low yaw angles from 0 to 10 for the quadrant section however with the extended-quadrant moulding there is a considerable improvement as the yaw angle is increased from 0 to 20 . With the extended quadrant moulding see Fig. c the air flow tends to move tangentially between the cab to trailer air gap some of the air then scrubs along the flat frontage of the trailer body until it reaches the extended-quadrant step is then deflected slightly rearwards and then again forwards before closely following the contour of the curved corner. This makes it possible for the air .
