为优化倒车涡轮静叶的设计,以双涵道一体化可直接倒车涡轮中的静叶作为原型叶片,构造了周向倾斜、弯曲、轴向掠及复合弯掠四种积叠形式的叶型,对静叶的气动性能及改型后的涡轮性能进行数值模拟,对比分析了叶型改变对涡轮性能的影响。研究表明:周向倾斜增加了气流的轴向速度,抑制了静叶叶背处的流动分离,涡轮功效提高；弯曲结构较倾斜时积叠线变化幅度减小,缓解了叶根处马蹄涡损失,采用最优弯曲角度较倾斜时涡轮效率提高且总压损失减小；采用前掠结构涡轮功率得到提高；后掠结构对静叶15％至60％叶高部分的总压损失改善明显；复合弯掠结构在提高了涡轮功率和进出口温差的同时,涡轮效率也得到了较好的控制。

In order to optimize the design of the stator blade cascade of the reversible turbine, the stator blade in the integrational double-bypass reversible power turbine was used as the prototype blade, and four stacked types of blades were constructed: circumferentially inclination, bowed, swept and composite bowed and swept. Numerical simulations were carried out on the aerodynamic performance of the stator blade and the overall performance of the turbine after the stator blade was changed, and the impact of the change of the stator blade structure on the overall performance of the turbine was compared and analyzed. The research shows that: the circumferential inclination increases the axial velocity of the airflow, inhibits the flow separation at the back of the stator blade, and improves the power and efficiency of the turbine; Compared with the inclined structure, having used the bowed structure, the change of the stacking line is reduced, and the loss of the horseshoe vortex at the blade root is alleviated , the turbine efficiency is improved and the total pressure loss is reduced when the optimal bending angle is compared with the inclined structure; the power of the turbine with the forward-swept structure is increased; The aft-swept structure significantly improves the total pressure loss of the stator blade at 15% to 60% of the blade height. The composite bowed and swept structure increases the turbine power and temper-ature difference between inlet and outlet, the efficiency of the stator blades are also well controlled.

国家科技重大专项（J2019-Ⅱ-0018-0039）