为了指导导叶-静叶结构的扇形叶栅试验，设计周期性好的叶栅试验件，本研究采用数值模拟的方法，研究试验件两侧导流挡板结构尺寸对扇形叶栅周期性的影响。通过对比改型试验件模型与原始试验件模型中径处导叶/静叶出口气流角、马赫数的周向分布规律和S1流面流场结构，分析两侧导流挡板结构对试验件周期性的影响，初步确定改型模型3为试验件模型。在此基础上详细分析了模型3的导叶/静叶流场结构。研究结果表明：本研究提出的挡板截断模型能够较好的改善扇形叶栅试验件的周期性，其中模型3将可测流道从4个增加到7个，可满足扇形叶栅风洞试验对试验件周期性的要求。

The baffle of the sectorial cascade was truncated in this paper in order to obtain the more passages with better periodicity and guided the sectorial cascade experiment. The influence on periodicity from different structure size of the baffle was numerically simulated and discussed. The Mach number and flow angle distributions on S1 section and outlet of the guide vane and stator at midspan were analyzed in three baffle truncated models with different truncated positions,and compared to the original baffle model for the preliminary periodicity evaluation. The baffle truncated model 3 was selected because of better periodicity at minspan,to study the detailed flow field structure of the guide vane and stator. The numerical results showed that the baffle truncated model can effectively improve the periodicity of the sectorial cascade. Compared to the original baffle model,the passages with better periodicity increase from 4 to 7 in baffle truncated model 3,and meet the periodicity requirement for wind tunnel tests.

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国家自然科学基金面上项目（51576024）；国家自然科学基金重点项目（51436002）；中央高校基本科研业务费专项资金资助(3132016202)