| 摘要 |
<p>A device for reducing the aerodynamic drag on a tractor-trailer is mounted on the tractor roof and includes a upwardly inclined rearwardy extending top surface having its leading edge faired into the tractor roof. The device has sidewalls which extend generally vertically to connect the outer edge of the top surface of the device with the roof of the tractor. The width of the device is substantially less at its leading edge than at its trailing edge. The vertical sidewalls connecting the tractor roof and the top surface may follow a linear, convex, or concave-convex path as they progress from front to rear and function to provide airflow streamlining around the trailer sides. The invention provides formulas by which the angle of rearward inclination for the optimum streamlining of airflow over the trailer roof may be calculated. Formulas are provided for devices having a top surface of either planar or curvilinear configuration.</p> |
