Adjoint-Based Finely Integrated Design of Endwall Region for a Linear Cascade

Abstract

With the development of aerodynamic design techniques for turbomachinery, the high-loss flow in the endwall region becomes a bottleneck issue restricting further enhancement of aerodynamic performance for fan/compressor. In this study, the endwall region of a linear cascade was flexibly parameterized by the advanced Extended Free-Form Deformation method and then finely optimized by adjoint optimization to make an integrated design of whole endwall region. A refined design with flexible hub deformation and smoothed changed of corner region was obtained, which has a similar geometric characteristic to the Full Blended Blade and End Wall technique. Results showed that the loss coefficient was significantly decreased by 16.81% and the corner separation was well controlled by the finely integrated design.

Keywords: Adjoint optimization, Integrated passage design, Endwall, Cascade, Corner separation.