波纹度偏差对高负荷压气机叶型的影响

Based on the analysis of the local machining quality of the compressor blade, this paper proposes a sine function mathematical model to describe the machining deviation of the waviness aiming at the key parameters describing the waviness. In response to the phenomenon of "small fluctuations" in the blade machining profile, the model effectively and intuitively reflects the height, width and initial phase parameters of the waviness with amplitude, frequency and initial phase. Taking a high-load blade profile of an engine as the object, the influence law and mechanism of the key geometric parameters of waviness deviation on the aerodynamic performance of the high-subsonic blade profile of the compressor arc studied by numerical simulation method. The results show that, with the same waviness width and initial phase, the range of angle of at-tack decreases with the increase of waviness height, and the increase of the local waviness height on the suction side will lead to an increase in flow loss. Poorly machined profiles with large waviness height and small waviness width undergo the most severe performance degradation, and when Ma = 0. 8, the loss is at least 24. 2% higher than the design blade profile. Based on the result, two suggestions are made to the existing processing technology: First, either a smaller waviness height or a larger waviness width shall be guaranteed, which can make the degradation of the blade profile performance not significant; second, the initial machining deviation state of the suction side can be selectively accepted according to the low range of loss for the blade profile.