| 摘要 |
The invention is directed to an improved curved intake duct through which fluid flows. The curved intake duct includes a fairing positioned upstream and adjacent to a valve stem which extends through the duct, a fairing downstream of the valve stem and adjacent thereto and a duct floor portion on the inside of the duct at the radius of curvature of the duct. The floor portion of the duct includes a flat section. The curvature including the flat section of the floor portion is a decreasing radius energy curve with a height Y at a distance X which follows the following equation, where Y=the longitudinal contour of the surface area at a distance according to the equation: f(x)=7.42x10-7X4-1.42x10-4X3+1.36x10-2X2-2.20x10-2X-3.56x10-3 between X=0 and X=85.1. The fairings and the floor portion can be used separately or in any combination thereof. The improvement provided by each separate element is additive. The use of all elements provides maximum efficiency to fluid flow through the duct.
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