空气动力学学报2024，Vol.42Issue(10)：109-118,10.DOI:10.7638/kqdlxxb-2024.0083
随机加工偏差下前缘超差对高亚声速叶栅性能一致性影响
Influence of leading edge over tolerance under random machining deviation on aerodynamic performance consistency of compressor cascade
摘要
Abstract
In the actual processing of the cascade blade,the leading edge is prone to exceeding the tolerance,while other parts of the blade are not.The discrepancy in processing tolerance results in a deterioration of the aerodynamic performance consistency of compressor cascades.This paper proposes a mathematical model that incorporates random deliations in blade processing across the entire arc length of the blade profile coupled with the leading-edge over tolerance.This study examines the impact of processing deviation uncertainties on the aerodynamic performance consistency of a high subsonic diffuser cascade.A non-intrusive polynomial chaos expansion method based on sparse grids was employed to achieve this.The results show that the consistency of the blade loss coefficient and static pressure ratio is optimal at the design angle of attack,while it is lowest at large positive angles of attack.The poor performance consistency can be attributsd to the fact that the leading edge deviations result in an increase in the mean and root-mean-square values of flow loss within the boundary layers around the blade leading edge.When using±5%deviation from the design blade as the criterion to measure the blade loss coefficient,the probability of blade profile performance consistency is 99%at the design angle of attack and 79.4%at large positive angles of attack.关键词
前缘/加工误差/不确定性量化/一致性/压气机叶栅Key words
leading edge/machining error/uncertainty quantification/consistency/compressor cascade分类
航空航天引用本文复制引用
高丽敏,杨光,王浩浩,但玥,涂盼盼..随机加工偏差下前缘超差对高亚声速叶栅性能一致性影响[J].空气动力学学报,2024,42(10):109-118,10.基金项目
国家自然科学基金(U2241249,51790512) （U2241249,51790512）
