The presence of pressure waves in an axial compressor cascade are ubiquitous and have been known and investigated for some time. Much of the work to date focuses on compressor acoustics and vibration, which is largely due to wake blade interactions and trailing edge shedding. However, it has been shown on free aerofoils that pressure waves can be produced from volume sources, such as separation, at non-negligible amplitudes. The work presented here highlights the presence of pressure waves emanating from the suction surface transition of a NACA 65 axial compressor cascade, and briefly investigates and details the influence different free-stream disturbances have on the frequency of the pressure waves produced.

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