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Experimental investigations of rotating instabilities in a low-speed research compressor
Published March 02, 1999 by Institution of Mechanical Engineers in United Kingdom
Rotating instabilities have previously been observed in the rotor blade rows of axial flow fans and high-speed compressors and may be responsible for the excitation of high amplitude blade vibrations and noise generation. They can be described as a rotating source mechanism, which moves relative to the rotor blades. This phenomenon causes vortex separations at the blade tips and a periodic reversed flow through the tip clearance of the rotor blades.
The paper describes experimental investigations of rotating instabilities in the four-stage, low-speed research compressor of Dresden University of Technology. The tip clearance of one rotor blade row has been enlarged step by step until rotating instabilities could be observed in the blade tip region.
The application of time-resolving sensors in both fixed and rotating frame of reference enables the detailed description of the circumferential structure and the spatial development of this unsteady flow phenomenon.