The conventional method of applying the five-hole spherical pitot probe to three-dimensional flow measurements consists of either adjusting the probe until its axis points in the flow direction, or yawing the probe until the meridian plane passing through the center orifice contains the flow angle, and then making use of two-dimensional calibration curves for the flow determination in this plane. Both methods require adjustment of the probe, which, in general, is quite difficult to accomplish if the probe is mounted upon a rotating impeller. To avoid this difficulty a five-hole, three-dimensional spherical pitot probe has been developed and calibrated to measure static pressure and the magnitude and direction of the velocity vector for any arbitrary flow angle without adjustment of the probe.

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