Rotor-Generated Vane Row Off-Design Unsteady Aerodynamics Including Dynamic Stall, Part 2

Blade row interaction effects on airfoil unsteady aerodynamics are investigated, particularly at off-design operating conditions. The specific problem addressed is off-design unsteady aerodynamics including dynamic stall due to the interaction of rotor-generated wakes with a downstream vane row. This is accomplished by obtaining detailed three-dimensional rotor-stator unsteady aerodynamic blade row interaction data in a low-speed axial-flow research compressor. These detailed data include measurements of the rotor wake generated unsteady aerodynamic forcing function to the downstream stator, the resultant stator vane steady and unsteady aerodynamic response, and particle image velocimetry (PIV) measurements of the time-variant stator midspan vane-to-vane flowfield. The rotor wake-generated forcing function and downstream stator steady and unsteady aerodynamic response data are described, with the time-variant PIV flowfield data described in the companion paper.