Considerations for Use of Three-Hole Probes for Turbomachinery Applications

What is it about?

Three-hole probes are used to determine the total pressure, static pressure, Mach number, and swirl angle of flows from three static pressure measurements. They are often employed to measure the flow fields of turbomachines. Despite their utility, three-hole probes incur errors that are difficult to quantify due to the probe installation, 3D flow angle effects, and unsteadiness. These are all frequent concerns when introducing an intrusive measurement device into the flow field of a turbomachine. We show the effects on the total pressure, static pressure, and swirl angle of the flow due to different error drivers from experimental and CFD data.

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