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stall characteristics and tip clearance effects in forward swept axial compressor rotors
Pages: 40-47
Year: Issue:  1
Journal: Journal of Thermal Science

Keyword:  Sweep Tip clearance Axial compressor Stall margin Tip leakage flows;
Abstract: <正> Tilting the blade sections to the flow direction (blade sweep) would increase the operating range of an axial compressordue to modifications in the pressure and velocity fields on the suction surface. On the other band, bladetip gap, though finite, has great influence on the performance of a turbomachine. The present paper investigatesthe combined effect of these two factors on various flow characteristics in a low speed axial flow compressor. Forthis present study, nine computational domains were modeled; three rotor sweep configurations (0°, 20° and 30°)and for three different clearance levels for each rotor. Commercial CFD solver ANSYS CFX 11.0 is used for thesimulations. Results indicated that tip chordline sweep is found to improve the stall margin of the compressor bymodifying the suction surface boundary layer migration phenomenon. Diffusion Factor (DF) contours showed theseverity of stalling with unswept rotor. For the swept rotors, the zones of high probable stall are less severe andthey become less in size with increasing sweep. Increment in the tip gap is found to gradually affect the performanceof unswept rotor, while the effect is very high for the two swept rotors for the earlier increments. As a minimumclearance is unavoidable, swept rotors suffer relatively higher deviation from the idealistic behavior than theunswept rotor due to tip clearance.
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