Near-wake measurement in a rotor/stator axial compressor using slanted hot-wire technique

 Three-dimensional near-wake structure behind a rotor was measured using slanted hot-wire technique in a large-scale, low-speed, rotor/stator axial compressor. Unsteady flow interaction between blade rows was varied by setting the axial gap between rows at 10% and 30% of rotor chord. Results show that stronger flow interactions between blade rows, or closer axial gap, produce more pronounced time variation within the rotor wake. All parameters measured – three component velocities, yaw and pitch angles – varied strongly within the wake, and are quantified. Received: 8 July 1996/Accepted: 29 May 1997