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采用五孔探针分别测量了6~26°不同攻角下,大转角高扩压度叶栅及增加小叶片后叶栅的出口流场。结果表明:大小叶片叶栅中,小叶片改善了设计工况下叶栅内部流动,抑制了大叶片吸力面及端壁角区流动损失向叶栅中部的发展;在较大与较小攻角时,叶栅流动损失明显增加;大攻角时大小叶片叶栅出口中部区域速度场得到明显改善,其余工况通流能力变化不大;大小叶片叶栅在所有工况下,出口截面上气流转角整体平均约增加3~5°,表明气动负荷有一定提升。
A five-hole probe was used to measure the outlet flow field at different angle of attack of 6 ~ 26 °, the high-angle and high-expansion cascades and the increase of small-blade cascades respectively. The results show that the small and medium blades in the blade cascade can improve the internal flow in the cascade under design conditions and inhibit the flow loss of the large blade and the corner zone to the middle of the cascade. At larger and smaller angles of attack , The flow loss of the cascade increases obviously; the velocity field in the middle of the outlet of the cascade cascade has a significant improvement at large angle of attack, while the flow capacity of the other cascades does not change much; in all conditions, The overall average corner increased about 3 ~ 5 °, indicating a certain increase in aerodynamic load.