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.