采用数值模拟和实验方法,对比分析了不同端壁间隙下平面叶栅攻角损失特性与角区流动结构的关联。各间隙情况下,当来流攻角大于某一数值时,角区失速的发生使得叶栅总压损失呈突跃式增加。小于该来流攻角时,无间隙叶栅损失最小。大于该来流攻角时,无间隙叶栅损失最大。分析表明,间隙的存在可以抑制间隙侧角区分离,并同时推迟无间隙侧角区失速的发生。 Numerical simulation and experimental method are used to analyze the relationship between the angle of attack loss and the flow field in different corner clearances. In each gap situation, when the angle of attack is more than a certain value, the total pressure loss in the cascade increases abruptly when the angular stall occurs. Less than the flow angle of attack, no gap cascade losses minimum. Greater than the flow angle of attack, the maximum gapless cascade loss. The analysis shows that the existence of the gap can suppress the separation of the angular side of the gap and delay the occurrence of the stall on the side of the gapless side.