Journal ArticleDOI
A method of calibration of a seven-hole pressure probe for measuring highly three-dimensional flows
TLDR
In this article, a non-nulling calibration method using a seven-hole pressure probe in the range of at intervals both in yaw and in pitch planes is developed and reported.Abstract:
In this paper, a non-nulling calibration method using a seven-hole pressure probe in the range of at intervals both in yaw and in pitch planes is developed and reported. Calibration is carried out in two stages, low angles (for the maximum centre hole pressure) and high angles (other cases). On the basis of the maximum probe pressure reading, the calibration region is divided into seven zones; one central zone and six side zones. The calibration coefficients are derived for each zone. For interpolation, a localized two-variable polynomial is used at each point with the calibration data surrounding it. Zone extension is another useful feature developed here, in which each boundary point of every zone is extended to the nearest calibration point of the adjacent zone. By doing so, for a measuring point falling in between the boundaries of two adjacent zones, one employs the extended zone boundary data for fitting a polynomial. In addition to calibration data, additional data are acquired in the calibration tunnel. These data are used as measured data and calibration curves of suitable zones are used to derive flow parameters. In general, the interpolation errors in flow angles are found to be within and the errors in total and static pressures are within 0.5% and 1% of the dynamic pressure respectively.read more
Citations
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Journal ArticleDOI
Effect of Chamfer Angle on the Calibration Curves of Five Hole Probes
TL;DR: In this paper, a special five-hole probe of 9.6 mm head diameter and 3 mm diameter pressure take off tubes was designed and fabricated, and the probe chamfer angle was varied from 30° to 60° in 5° steps.
Journal ArticleDOI
A robust calibration method for seven-hole pressure probes
TL;DR: A robust calibration method for seven-hole pressure probes is presented, which can also be applied when a hole port is malfunctioning and can be easily applied to other multi-hole (including but not limited to seven- hole) pressure probes.
Journal ArticleDOI
Extended Calibration Technique of a Four-Hole Probe for Three-Dimensional Flow Measurements
TL;DR: In this paper, a cantilever type cylindrical four-hole probe of 2.54 mm diameter is calibrated at a probe Reynolds number of 9525. The probe operative angular range is extended using a zonal method by dividing into three zones, namely, center, left, and right zones.
References
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Journal ArticleDOI
Seven-hole cone probes for high angle flow measurement Theory and calibration
TL;DR: In this article, a non-nulling seven-hole conical pressure probe capable of measuring flow conditions at angles up to 75 degrees relative to its axis is described, which can be used in subsonic compressible and incompressible flows.
Journal ArticleDOI
Modified calibration technique of a five-hole probe for high flow angles
C. Ostowari,W. H. Wentz +1 more
TL;DR: In this paper, a method for calibrating a five-hole probe for extending the useful measurement range up to flow angularities of 85° is described, which involves adjustment of the calibration coefficients to allow valid calibration at larger flow angles.
Journal ArticleDOI
Seven hole probe measurement of leading edge vortex flows
TL;DR: In this paper, the use of a seven-hole probe on measurements of leading edge vortices of highly sweep delta wing planforms was compared with nonintrusive measurements made with laser Doppler anemometry system.