| Citation: | LIU Yingshi, LYU Dong, KONG Xing’ao, et al. Effect of positional uncertainty on performance of auxiliary positioning film cooling hole[J]. Journal of Aerospace Power, 2025, 40（4）：20240530 doi: 10.13224/j.cnki.jasp.20240530
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An auxiliary positioning film hole scheme utilizing pre-cast ribs and dimples in turbine blade workblank was proposed. These structures not only improved the film cooling performance, but also enhanced the resistance to the performance degradation by the positional deviations in drilling. The cylindrical hole was chosen as a benchmark. And within the limit of a typical position tolerance, the sample space was established including the theoretically exact and characteristic positional deviation models of both schemes. Comparative analysis of film mixing flow and cooling performance was carried out by employing numerical simulations. For the theoretically exact model of the auxiliary positioning hole, the dimple at the outlet inhaled the main inflow, thus the surface-attachment of the secondary flow was enhanced. As a result, the novel scheme reached up to 2.83 times the size of the film coverage area of the cylindrical hole. In terms of the positional deviation, the cooling performance of the novel scheme exhibited a positive correlation with the main flow intrusion depth, and even benefited from the spanwise tilted deviation. In the entire sample space, the auxiliary positioning holes achieved totally better performance than the cylindrical ones. At the same deviation position, the amplitude of the film coverage area coefficient increased from 0.37 to 5.77.
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