Non-axisymmetric endwall based on secondary flow control law modeling optimization design
To deal with corner separation in high-load axial compressors,a new endwall contouring method for controlling the endwall second flow in more than one local area,generating the geometry with fewer control variables,and adapting to multiple working conditions was proposed.According to the idea of the new method,surface units with different effects on endwall secondary flow were defined,then their effects were combined by superimposing their geometry.Then the method was applied to multi-objective optimization design,The optimization results showed that the total pressure loss coefficient of the high-load cascade was reduced by 0.03 at the design point and 0.05 at the increased incidence.Compared with the traditional method,the optimization design process of the new method converged faster and the calculation time was shorter.As per the most effective design rules,an endwall surface with the rising suction side and sinking pressure side in the blade channel was constructed while locally raising the suction surface corner with a gentle upstream slope.The flow field analysis showed the new method achieved a clear and intuitive influence on the endwall geometry with fewer control variables.Also,it effectively combined the functions of the surface units in secondary flow control to suppress the corner separation.It thus indicates the advantages of the newly developed endwall contouring method compared with previous studies.
万方数据
维普
