An experimental study of wedge probe wall proximity effects is described in Part 1 of this paper. Actual size and large-scale model probes were tested to understand the mechanisms responsible for this effect, by which free-stream pressure near the outer wall of a turbomachine may be overindicated by up to 20 percent dynamic head. CFD calculations of the flow over two-dimensional wedge shapes and a three-dimensional wedge probe were made in support of the experiments, and are reported in this paper. Key flow structures in the probe wake were identified that control the pressures indicated by the probe in a given environment. It is shown that probe aerodynamic characteristics will change if the wake flow structures are modified, for example by traversing close to the wall, or by calibrating the probe in an open jet rather than in a closed section wind tunnel. A simple analytical model of the probe local flows was derived from the CFD results. It is shown by comparison with experiment that this model captures the dominant flow features.
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July 1997
Research Papers
Investigation of Wedge Probe Wall Proximity Effects: Part 2—Numerical and Analytical Modeling
P. D. Smout,
P. D. Smout
Rolls-Royce plc., Derby, United Kingdom
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P. C. Ivey
P. C. Ivey
School of Mechanical Engineering, Cranfield University, Bedford, United Kingdom
Search for other works by this author on:
P. D. Smout
Rolls-Royce plc., Derby, United Kingdom
P. C. Ivey
School of Mechanical Engineering, Cranfield University, Bedford, United Kingdom
J. Eng. Gas Turbines Power. Jul 1997, 119(3): 605-611 (7 pages)
Published Online: July 1, 1997
Article history
Received:
February 1, 1996
Online:
November 19, 2007
Citation
Smout, P. D., and Ivey, P. C. (July 1, 1997). "Investigation of Wedge Probe Wall Proximity Effects: Part 2—Numerical and Analytical Modeling." ASME. J. Eng. Gas Turbines Power. July 1997; 119(3): 605–611. https://doi.org/10.1115/1.2817027
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