A Physical Interpretation of Swept Blades in Axial Compressors Employing Spanwise Equilibrium Analysis

Abstract

Swept blades are extensively utilized in modern fan and compressor designs to balance the competing requirements of high loading, high throughflow, and adequate stall margin. However, the variations in incidence angle caused by blade sweep add significant complexity to the design process, often necessitating iterative adjustments based on designer expertise. To address these challenges and develop quantitative design tools, this study employs a spanwise equilibrium method to systematically investigate the key factors affecting incidence angle variations. The results reveal that, in contrast to straight blades, swept blade configurations modify spanwise pressure gradients and tangential flow components, inducing flow migration that rebalances the inflow field. This rebalancing process results in spanwise variation of the incidence angle, complicating the design process. By analyzing spanwise forces, this study provides new insights into the influence of design parameters on flow behavior, offering a foundation for more accurate and efficient methodologies in swept blade design.