Influence of blade characteristics on axial flow compressor noise

This experimental study was initiated as a result of earlier theoretical work which found that changes in the spanwise circulation distribution can have a significant influence on noise generation for the single rotor and for rotor-stator combinations. The experimental results presented here clearly show that the rotor noise, and especially the rotor-stator interaction noise, is affected by the type of radial loading, i.e., type of twist. Other blade parameters tested for their influence on far-field noise include rotor solidity, spacing between rotor and stator for twisted and untwisted blades, blade thickness, and stator chord length; radial effects on cutoff were also investigated.