This paper presents an experimental and analytical study of the impact of forward swept rotors on tip-limited, low-speed, multistage axial compressors. Two different configurations were examined, one with strong tip-clearance flows and the other with more moderate levels. Evaluations were done at multiple rotor tip clearances to assess differences in clearance sensitivity. Compared to conventionally stacked radial rotors, the forward swept blades demonstrated improvements in stall margin, efficiency and clearance sensitivity. The benefits were more pronounced for the configuration with stronger tip-clearance flows. Detailed flow measurements and three-dimensional viscous CFD analyses were used to investigate the responsible flow mechanisms. Forward sweep causes a spanwise redistribution of flow toward the blade tip and reduces the tip loading in terms of static pressure coefficient. This results in reduced tip-clearance flow blockage, a shallower (more axial) vortex trajectory and a smaller region of reversed flow in the clearance gap.
The Impact of Forward Swept Rotors on Tip Clearance Flows in Subsonic Axial Compressors
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003. Manuscript received by the IGTI December 2002; final revision March 2003. Paper No. 2003-GT-38837. Review Chair: H. R. Simmons.
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McNulty , G. S., Decker , J. J., Beacher, B. F., and Khalid, S. A. (December 29, 2004). "The Impact of Forward Swept Rotors on Tip Clearance Flows in Subsonic Axial Compressors ." ASME. J. Turbomach. October 2004; 126(4): 445–454. https://doi.org/10.1115/1.1773852
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