Abstract Tandem cascade is an effective aerodynamic design approach for suppressing boundary layer separation and improving the stability margin. To obtain subsonic tandem cascades with excellent performance and establish corresponding general design principles, this paper performs a multi-condition coupled optimization on both the airfoil shape and configuration parameters of tandem cascades. The coupling optimized tandem cascade (OPT₁1VAR) is compared with the configuration-only optimization results (OPT₅VAR). Comparative analysis shows that compared to the original tandem cascade, the total pressure loss coefficient (ω) for OPT₅VAR is reduced by 18. 0% at 4° incidence angle while achieving an 8. 9% increase in incidence margin. Interestingly, the optimal configuration parameters for OPT₁1VAR differ from those of OPT₅VAR, demonstrating that airfoil shape significantly influences configuration optimization. Furthermore, OPT₁1VAR achieves enhanced performance compared to OPT₅VAR, reducing ω by 29. 8% at 4° incidence angle and increasing the incidence margin by 14. 5%. This study proposes new design criteria for tandem cascades and demonstrates the interdependence between airfoil shape and configuration parameters.
Mao et al. (Wed,) studied this question.