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Research Papers: Fundamental Issues and Canonical Flows

Improvements to Common Data Reduction and Calibration Methods for Seven Hole Probes

[+] Author and Article Information
James Crawford

e-mail: crawfordj@me.queensu.ca

A. Michael Birk

Mem. ASME
e-mail: birk@me.queensu.ca
Queen's University,
Kingston, ON, K7L 3N6, Canada

1Corresponding author.

Manuscript received June 20, 2012; final manuscript received January 14, 2013; published online March 18, 2013. Assoc. Editor: Peter Vorobieff.

J. Fluids Eng 135(3), 031206 (Mar 18, 2013) (6 pages) Paper No: FE-12-1303; doi: 10.1115/1.4023649 History: Received June 20, 2012; Revised January 14, 2013

The influence of calibration data sorting procedures and the order of polynomial curve fit used to calibrate seven hole pressure probes in subsonic, incompressible flow are discussed. It is shown that the inclusion of fourth order polynomial terms is necessary to properly model the physical response of the probe. It is also shown that the uniformity of probe response error is significantly affected by polynomial extrapolation near sector boundaries, and that the uniformity can be improved by using some calibration points in multiple sectors.

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References

Figures

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Fig. 1

(a) Probe isometric view and (b) hole numbering and angle conventions. Coordinate system origin is in the middle of port 1.

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Fig. 2

Influence of calibration grid density on error. (a) Low angle flows and (b) high angle flows.

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Fig. 3

PDynamic residuals. (a) Third order polynomial fit and (b) fourth order polynomial fit.

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Fig. 4

Influence of overlap pressure on error distribution. The calibration points used in the calibration of sector 7 are also shown for illustrative purposes. (a) No overlap pressure and (b) 0.15q overlap pressure.

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Fig. 5

Effect of changing overlap pressure

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