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Pitot-tubes at 90 and 180 degrees of yaw

Published online by Cambridge University Press:  04 July 2016

O. O. Mojola
O. O. Mojola*
Affiliation:
Department of Agricultural Engineering, University of Ife, Nigeria
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Extract

As a total pressure sensor in laminar or turbulent flows, the conventional, circular, pitot-tube, with a sharp plane mouth and diameter ratio of about 0.6, has long been known to be insensitive to yaw within about ±10°, relative to the incident stream direction, and, apart from a few isolated attempts to design special pitot-probes having a flat yaw response of over ±45° or thereabouts, information on pitot-tube response at very large yaw angles (>45°, say) is virtually non-existent, even though such information might be sometimes useful.

In this brief note is presented some exploratory measurements of pitot-tube response in a uniform stream at two particular yaw angles, namely 90° and 180°. While the 90° angle was chosen largely out of pure curiosity, the choice of 180° yaw has been motivated by some questions raised in a study on pressure-probe interference in a vortex flow. Included is a brief discussion of the effects of shear on the pitot-tube response.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 82 , Issue 812 , August 1978 , pp. 355 - 357
Copyright
Copyright © Royal Aeronautical Society 1978 

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References

1. Bryer, D. W. and Pankhurst, R. C. The determination of windspeed and flow direction by pressure sensing instruments. NPL Aero Special Report 010, 1968.Google Scholar
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3. Mojola, O. O. Pressure-probe interference in a vortex flow. (To be published.)Google Scholar
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