Measurements of the flow from a high speed compressor rotor using a dual probe digital sampling (DPDS) technique
Abstract
The flow from a high speed rotor in a rotor-first arrangement
has been measured using a "dual-probe, digital
sampling (DPDS)" technique. The flow field was found to be
steady in rotor coordinates (periodic in machine coordinates)
outside the rotor wake, and 3 components of velocity and the
pressure field were determined in this area. The wake regions
were unsteady. In these regions the measurements based
on ensemble averages of multiple samples did not follow the
behavior established in steady uniform flow except near the
wake center. The broadening of the wake and three dimensional
effects in the flow field were measured at reduced throttle
and increased speeds. The potential for the measurement technique
is discussed in some detail.