| 摘要 |
A vehicle comprising at least one pressure-drag-reducing apparatus (1) for reducing the pressure drag on the vehicle. The apparatus comprises: a housing (31) at least partly defining a cavity (34) and an aperture (35) in the housing (31), the cavity (34) in fluid communication via the aperture (35) with the environment surrounding the vehicle; and oscillating means (32, 36) for creating an oscillation in pressure across the aperture between the cavity and the environment. The cavity volume, the frequency of oscillation, the aperture size and the amplitude of oscillation are arranged to cause fluid to be alternately drawn into, and ejected from, the cavity through the aperture. The apparatus is positioned relative to the remainder of the vehicle such that the ejected fluid entrains fluid from the environment to reduce pressure drag on the vehicle. |
