非轴对称端壁造型对叶栅性能影响研究

Research on Influence of Non-axisymmetric Endwall Contouring in Compressor Cascade

本文研究了一种非轴对称端壁参数化造型方法,基于该参数化造型方法构建了自动优化设计平台,并将其应用于压气机叶栅的端壁优化,对其优化结果与原型进行了对比分析,详细探讨了端壁造型对叶栅性能的影响。研究表明:非轴对称端壁通过抑制角区分离,显著提升了压气机叶栅的气动性能。在设计状态下,优化后的非轴对称端壁对内部流动的影响主要集中在叶栅30%展高以下。与常规的叶栅相比,在-4°~6°攻角范围内非轴对称端壁使得叶栅总压损失降低23%~27%,静压升系数提高16.5%~18.4%。

The parameterization of non-axisymmetric endwall surface is investigated and the global optimization platform which is composed of the genetic algorithm and neural network response model is developed.Adopting this platform,the endwall of compressor cascade is optimized.The numerical results indicate that the non-axisymmetric endwall can improve the aerodynamic performance of cascade by suppressing corner flow separation.The impact of optimization non-axisymmetric endwall on internal flow is mainly concentrated under 30%of cascade span near design point.Compared with the traditional cascade,the non-axisymmetric endwall structure would reduce the cascade total pressure loss by 23%to 27%and increase static pressure by 16.5%to 18.4%during the different attack angels.