| 摘要 |
Apparatus for sensing the total pressure of a fluid flowing through a duct by a plurality of open-ended impact tubes fixedly arranged in a transverse plane of the duct and connected to a common manifold tube. Flow straightening means upstream of each sensing tube are provided by individual straightener tubes, open at both ends and arranged axially in the direction of fluid flow, in association with each sensing tube. The straightener tubes extend upstream from the ends of the impact tubes by a distance equal to at least eight times the transverse dimension of the straightener tube. In the preferred embodiment, separately manifolded static pressure sensing tubes are also provided, and serve as support means for the straightener tubes.
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