非轴对称端壁对压气机叶栅迎角特性的影响

The influence of non-axisymmetric endwall on the incidence characteristics of a compressor cascade is investigated using a three-dimensional inverse design method. The inverse design method specifies the static pressure distribution on the endwall and iteratively derives the corresponding endwall shape, thereby integrating flow mechanisms into the design process. A critical aspect of the inverse design is the quantitative determination of an appropriate endwall pressure distribution. The cross-passage pressure distribution on the endwall is determined by employing a dynamic model of cross-flow. The effects of the non-axisymmetric endwall (designed at 0 degrees incidence) on corner flow are analyzed at various incidence angles. The results indicate that, while maintaining the pressure difference between the suction and pressure surfaces, locally enhancing the cross-flow near the suction side in the rear part of the passage can direct higher-velocity fluid of the endwall boundary layer into the corner region, thereby suppressing corner separation. Within an incidence range of −4 to +8 degrees, corner separation is effectively controlled. The flow control effect is most pronounced at +4 degrees incidence, where the total pressure loss of the cascade is reduced by 13.5%.