Spectral proper orthogonal decomposition of compressor tip leakage flow

To identify the spatiotemporal coherent structure of compressor tip leakage flow, spectral proper orthogonal decomposition (SPOD) is performed on near-tip flow field and blade surface pressure a low-speed rotor. The data used for SPOD analysis are obtained by delayed-detached eddy simulation, which validated against experimental data. investigated rotor governed two vortices (TLV), passage can be divided into four zones: formation main TLV (Zone I), breakdown II), blockage cell III), secondary IV). Modal from shows that major part total disturbance energy comes oscillating mode in Zone I vortex shedding III, both low-frequency low-rank; contrary, modal components Zones II IV broadband non-low-rank. Unsteady forces mainly generated impingement rather than detachment suction IV. These identified structures provide valuable knowledge aerodynamic/aeroelastic effects, turbulence modeling, reduced-order modeling flow.