Velocity measurements in a transonic compressor using a calibrated pressure probe.
Abstract
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.