Velocity measurements in a transonic compressor using a calibrated pressure probe.
Anderson, Dennis Jay
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The application is reported of a United Sensor Corporation 5-hole pressure probe to determine the flow field upstream and downstream of the rotor of a transonic compressor operating to near sonic speeds. Calibration of the probe was reduced to a set of equations to allow off-line data reduction and presentation .using a Hewlett-Packard Model 9830A Calculator system. The flow velocities and angles measured upstream of the rotor were compared with results of compressible flow calculations. Blockage factors were determined which related analytical approximations of the flow incident at the rotor to the measured flow rate. The measurements downstream of the rotor were compared with those of a second probe of different design. Both probes required corrections to their calibrations which were established in an axial annular flow of similar geometric cross section. It is shown that the results derived from the corrected calibration of the 5-hole probe were the more accurate.
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