| 摘要 |
A fluid flow control damper having one or more blades for sensing pressures to determine velocity pressure in the flow stream. The airfoil damper blade has fluid intake openings in a portion of the blade which extends into the fluid stream upstream of the damper and it has inlet openings in a portion of the blade which extends into the stream downstream of the damper. Pressurized fluid from each side of the damper is conducted through separate chambers in the blade and through outlets on the blade axis to instrumentation which reads the pressures and computes the pressure differential between the pressures at each side of the damper. The pressure inlet openings are disposed in elongated channels along the side edges of the blade to protect the inlets from spurious pressure fluctuations which would adversely affect the accuracy of the pressure sensings.
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