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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Influence of Tip Shape on Reynolds Number Sensitivity for a Seven Hole Pressure Probe

[+] Author and Article Information
James Crawford

e-mail: crawfordj@me.queensu.ca

A. Michael Birk

e-mail: birk@me.queensu.ca
Department of Mechanical and
Materials Engineering,
Queen's University,
McLaughlin Hall,
Kingston, ON K7L 3N6, Canada

1Corresponding author.

Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received June 26, 2013; final manuscript received June 28, 2013; published online August 19, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(9), 091602 (Aug 19, 2013) (6 pages) Paper No: GTP-13-1184; doi: 10.1115/1.4024950 History: Received June 26, 2013; Revised June 28, 2013

The effects of tip shape on Reynolds number sensitivity of a seven hole pressure probe are studied over a range of flows associated with practical use of turbomachinery. It is shown that at low flow angles the response of a conical or hemispherical tipped probe is independent of a Reynolds number above Re = 3000, and at high flow angles Re = 6000. Despite there not being a discernible difference in the average error in flow properties at different Reynolds numbers between the two tip shapes, it is shown that the hemispherical tip is preferred because the pressure distributions around the tip are more consistent.

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References

Gallington, R. W., 1980, “Measurement of Very Large Flow Angles With Non-Nulling Seven-Hole Probes,” Aeronaut. Dig., USAFA-TR-80-17, pp. 60–88.
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Crawford, J. D., 2011, “Design and Calibration of Seven Hole Probes for Flow Measurement,” M.Sc., thesis, Department of Mechanical and Materials Engineering, Queen's University. Kingston, ON, Canada.
Crawford, J. D., and Birk, A. M., 2013, “Improvements to Common Data Reduction and Calibration Methods for Seven Hole Probes,” ASME J. Fluid Eng., 135(3), p. 031206. [CrossRef]
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Zilliac, G. G., 1993, “Modelling, Calibration, and Error Analysis of Seven Hole Pressure Probes,” Exp. Fluids, 14(1–2), pp. 104–120. [CrossRef]
Wenger, C. W., and Devenport, W. J., 1993, “Seven Hole Pressure Probe Calibration Method Utilizing Look-Up Error Tables,” AIAA J., 37(6), pp. 675–679. [CrossRef]
Rediniotis, O. K., and Vijayagopal, R., 1999, “Miniature Multihole Pressure Probes and Their Neural-Network Based Calibration,” AIAA J., 37(6), pp. 667–674. [CrossRef]
Chen, Q., and Birk, A. M., 2009, “Experimental Study of Oblong Exhaust Ejectors With Multiring Oblong Entraining Diffusers,” ASME J. Eng. Gas Turbines Power, 131(6), p. 062302. [CrossRef]
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Redinotis, O. K., 1999, “Novel, Miniature Multi-Hole Probes and High-Accuracy Calibration Algorithms for Their Use in Compressible Flowfields,” Final Report NASA Langley Flow Modeling and Control Branch, NAG-1-1753.
Silva, M. C. G., Pereira, C. A. C., and Cruz, J. M. S., 2003, “On the Use of a Linear Interpolation Method in the Measurement Procedure of a Seven-Hole Pressure Probe,” Exp. Thermal Fluid Sci., 28, pp. 1–8. [CrossRef]
Becker, H. A., and Brown, A. P. G., 1974, “Response of Pitot Tubes in Turbulent Streams,” J. Fluid Mech., 62(1), pp. 85–114. [CrossRef]
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Thompson, M. C., Leweke, T., and Provansal, M., 2001, “Kinematics and Dynamics of Sphere Wake Transition,” J. Fluids Struct., 15(3–4), pp. 575–585. [CrossRef]
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Figures

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Fig. 1

Probe numbering and angle conventions. Coordinate system origin is in the middle of port 1.

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Fig. 2

Pressure distributions around a circular cylinder

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Fig. 4

Tip shape profile schematic

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Fig. 5

Rotary positioner and wind tunnel outlet

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Fig. 6

Yaw meter performance of a seven hole probe with conical tip

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Fig. 7

Yaw meter performance of a seven hole probe with hemispherical tip

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Fig. 8

Pressure coefficient distributions around probe tip and a circular cylinder

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Fig. 9

rms average errors for both tip shapes

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Fig. 10

Average errors in a conical tipped probe

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Fig. 11

Average errors in a hemispherical tipped probe

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Fig. 12

Effect of Reynolds number on yaw meter performance: (a) conical tip and (b) hemispherical tip

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Fig. 13

Effect of Reynolds Number on pressure coefficient distribution at 50 deg cone angle: (a) conical tip and (b) hemispherical tip

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