中文摘要：

提出了一种实现截面局部扭转、控制喉部面积的扭叶片参数化造型方法。用控制喉部面积替代流量约束，对某蒸汽透平高压级动叶进行了气动优化设计；另一方面以流量差异和气动效率为目标函数，采用非支配排序遗传算（NSGA-II）进行了多目标并行优化设计。两种方法的结果吻合较好。结果表明，本文的优化方法是有效的，扭积叠造型有助于提高蒸汽透平高压级的气动效率。

英文摘要：

In the present paper, a parametric modeling method for twist blade is established, which can partially rotate a blade section and control the blade＇s throat. The rotor blade of a HP steam turbine stage is optimized by using an idea of controlling its throat instead of mass flow constraint. The rotor blade is also optimized by a multi-objective method named Non-dominated Sorting Genetic Algorithm II （NSGA-II）, which minimizes mass flow difference and maximizes efficiency simultaneously. The results of the two optimizations are well conformed, indicating that the optimization methods are valid and twist blade is useful to enhance HP steam stages＇ efficiency.