Observations on Performance of Three-Tube Pitot Probe
Publication: Journal of Hydraulic Engineering
Volume 126, Issue 9
Abstract
This technical note discusses two questions related to three-tube (pitch or yaw) pitot probes, which are used for measuring the velocity vectors in 2D flows. When a pitch probe is used in flows in which the third component of the velocity is small but not zero, it is important to know the error this causes in the measurement of the velocity vector. Calibration experiments on a pitch probe showed that as long as the yaw angle is less than 14°, the relative error in the velocity measured by the pitch probe is less than 3% and the error in the pitch angle is less than 1°. Typically a pitch or yaw probe can only be used when the angle of attack is less than approximately 50°. The second part of this work addresses the practical issues associated with pretilting the probe to measure flows at angles greater than 50°.
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References
1.
Bryer, D. W., and Pankhurst, R. C. (1971). Pressure-probe methods for determining wind speed and flow direction, Her Majesty's Office, London.
2.
Chue, S. H. (1975). “Pressure probes for fluid measurement.” Progress in Aerosp. Sci., 16(2), 147–223.
3.
Pani, B. S. ( 1972). “Three dimensional turbulent wall jet.” PhD thesis, University of Alberta, Edmonton, Canada.
4.
Rajaratnam, N., and Muralidhar, D. (1967). “Yaw and pitch probes.” Tech. Rep., Dept. of Civ. Engrg., University of Alberta, Edmonton, Canada.
5.
Wu, S., Rajaratnam, N., and Katopodis, C. (1999). “Four-tube probe for velocity measurements in 3D flows.”J. Hydr. Engrg., ASCE, 125(6), 604–609.
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Received: Mar 2, 1999
Published online: Sep 1, 2000
Published in print: Sep 2000
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