Four Hole Probe

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Pressure probes are employed to obtain pressure and velocity fields for both external and internal flows. These devices are built with several holes on the probe head,where the pressure is sensed to retrieve the flow conditions afterwards. In the case of two-dimensional flows, three holes are usually sufficient to characterize the basic fluid dynamic structures. If the flow presents a clear three-dimensional, then four holes will be at least needed to capture the complex flow features. Additionally, the probes can be designed with a great variety of head geometries (spherical, cylindrical, conical, cobra-type, etc.) providing very different operational (measuring) ranges