多排缝孔平板气膜冷却特性的数值与实验研究

The key to thermal protection of high-temperature components in gas turbines lies in optimizing film cooling effectiveness, while the cooling performance of multi-row trapezoidal slot hole arrangements is affected by the complex coupling of geometric parameters (arrangement pattern, row spacing and hole spacing) and flow parameters (blowing ratio). A method combining numerical simulation and pressure sensitive paint (PSP) experiment was adopted to systematically investigate the cooling characteristics of three arrangement patterns—in-line, staggered and offset—under flat plate conditions, considering different row spacings, hole spacings, and a blowing ratio range of 0. 25 to 2. 0. The results show that the staggered arrangement exhibits the optimal spanwise coverage and cooling uniformity, with its cooling effectiveness significantly higher than that of the in-line arrangement; the influence of row spacing shows arrangement dependence, the cooling efficiency of the in-line arrangement increases with the increase of row spacing, rising from 0. 338 at 5 mm to 0. 369 at 20 mm, while the cooling efficiency of the staggered arrangement increases with the decrease of row spacing and reaches a peak value of 0. 500 when the row spacing is 5 mm; in addition, under limited cooling air flow, reducing the hole spacing can enhance the cooling effect, and the area-averaged cooling efficiency of the staggered arrangement reaches a maximum of 0. 44 when the blowing ratio is 2. 0 and the row spacing is 5 mm.