Aeroelastic Response and Wake Analysis of a Blade Cascade Exposed to Controlled Radial Cross-Flow

The aeroelastic stability of a blade cascade exposed to a strongly three -dimensional cross - flow field is experimentally investigated. A linear cascade consisting of thirteen flexible NACA 0010 blades is studied in a wind tunnel equipped with a bypass system that introduces a controlled radial velocity component. The influence of cross -flow on blade vibration response and wake topology is examined using time -resolved particle image velocimetry. While the cascade remains stable under purely axial inflow, the introduction of radial cross -flow leads to the onset of self -induced blade oscillations with increasing amplitude. The wake structure transitions from a regular vortex street to a highly three - dimensional and chaotic flow characterized by broadband frequency content. The results highlight the significant role of radial flow in destabilizing blade cascades under off -design operating conditions.