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66 Fluid Mechanics, Thermodynamics of Turbomachinery


























































                          FIG. 3.9. Some combination pressure probes (adapted from Bryer and Pankhurst 1971):
                                     (a) claw probe; (b) chamfered tube probe; (c) wedge probe.


                            Some representative combination pressure probes are shown in Figure 3.9. These
                          types are frequently used for pitchwise traversing across blade cascades but, because
                          of their small size, they are also used for interstage (radial) flow traversing in
                          compressors. For the measurement of flow direction in conditions of severe trans-
                          verse total pressure gradients, as would be experienced during the measurement of
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