Secondary cross flow limits the aerodynamic loading level of turbomachinery. Vortex generators have the potential to attenuate secondary cross flow when they are implemented at the endwall of the blade passage. An efficient method for designing the optimal vortex generator layout was presented based on a mathematical model (BAYC model) and an optimization procedure with response surface methods. In order to illustrate the proposed method

three layouts of vortex generators were optimized in an NACA 65 straight cascades. The flow mechanism of the vortex generators to control the endwall secondary cross flow were analyzed under design and off-design conditions. The results demonstrate that a higher vortex generator and a larger number of vortex generators can be more efficient to weaken the secondary cross flow when the incidence angle of the cascade is large. The application of the vortex generators can improve the load adaptability of the compressor cascade.