| 摘要 |
A duct provides a passageway for a portion of the fluid which contacts the upstream end of a conveyance such as a ship, motor vehicle, train or airship. The intake of the duct is located on the front wall of the conveyance and its outlet is located on its side, top or bottom wall downstream of the inlet. The duct has a convergent-divergent nozzle and a segment which increases in cross-section downstream of the nozzle. The duct serves not only to improve the efficiency of fuel required to power the conveyance but also to reduce the output of pollutants generated as the fuel is consumed.
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