Abstract
The diffuser vane of the high-speed centrifugal compressor is subjected to lean in the current study’s numerical analyses.Lean can be defined as a shift in the stagger angle in the vane’s span-wise direction. Three different leans, including lean at the vane’s leading edge, trailing edge, and lean with regard to the centroid of the vane, are examined in the current study. When compared to the base scenario, a diffuser with a lean on CG of −4° and +4° improved the isentropic efficiency of the compressor by 4.7% while maintaining a stable operating range. When compared to a vaned diffuser without lean, the maximum flow limit is raised by adding lean to the diffuser. In the case of leading edge lean, static pressure recovery improved by 1.63% and 0.98% at −4° and +4° lean angles, respectively, as compared to a vaned diffuser without lean pressure recovery at the design condition.
