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Experimental investigations of rotating instabilities in a low-speed research compressor
Technical Paper
1999-04-0102
Sector:
Language:
English
Abstract
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.