| 摘要 |
The present invention relates to the improvement of the aerodynamic properties of bluff-body shaped ground vehicles (100). At least one air modulator (210, 210a, 210b1, 210b2, 210c, 210e) is assembled on the vehicle (100) to modify an air flow (F) around the vehicle (100), such that the drag on the vehicle (100) is decreased. Each air modulator (210, 210a, 210b1, 210b2, 210c, 210e) has an array of openings (215) including a number of openings, which are arranged next to one another along an essentially straight line. A control unit (230) controls the at least one air modulator (210, 210a, 210b1, 210b2, 210c, 210e) to output oscillating air from each opening such that air vortices (150) are formed outside the opening. The at least one air modulator (210, 210a, 210b1, 210b2, 210c, 210e) is arranged on the vehicle (100), such that these air vortices (150) have spin axes that in proximity to the opening are essentially perpendicular to a forward driving direction (D F ) of the vehicle (100).
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