Multistage Axial-Flow Turbomachine Wake Production, Transport, and Interaction

To aid in the understanding of rotor and stator viscous wake interaction, slowand fast-response instrumentation has been employed to obtain time-average and instantaneous periodic-average flowfield measurements between the blade rows in a low-speed multistage axial-flow compressor. Quantitative measurements indicate that the rotor blade wake pattern can vary significantly when influenced by an upstream stationary blade row, and that relative circumferential positioning of the stationary blade rows can have considerable influence on downstream rotor and stator flowfields. Differences in aerodynamic and acoustic characteristics resulting from changes in unsteady wake interaction patterns were observed.