Back swept angle performance analysis of centrifugal compressor
Keywords: centrifugal compressor, back sweep angle, TurboSystem, CFX
AbstractThe effects of back swept angle about compres-sor performance are investigated by using a radial back swept impeller designed on TurboSystem. 3D impellers Design with 0°, 2.5°, 5°, 7.5°, 10°, 12.5°, 15° and 17.5° back swept angles are obtained by changing the impeller outlet angle. CFX is used to simulate internal flow field of these impellers and generate the centrifugal compressor report that parameters consist of pressure ratio, isentropic efficiency and volume flow rate. These parameters are analyzed and compared. The results of the CFD indicate that an appropriate back swept angle can improve these parameters. The relative Mach number distributions are visualized and the reason that causes total pressure loses are analyzed. Shock wave can cause a loss of total pressure. These studies are the foundation of multidisciplinary optimization of impeller.
DESIGN AND OPTIMIZATION OF MECHANICAL SYSTEMS