冷却孔结构对燃烧室性能和壁面冷却效果影响的数值模拟研究

To improve the uniformity of the temperature distribution at the outlet of the combustor and solve the wall ablation issue at the front end of the liner, a three-dimensional model of a lean-burn premixed combustor with an effusion cooling structure is established. Based on the k-ω SST turbulence model, FGM combustion model, discrete phase model, and DO radiation model, the effects of the cooling hole diameter and angle on the performance of the combustor performance and the wall cooling effect is simulated and studied. The results indicate that when the cooling hole diameter increases from 0.5 mm to 1.0 mm, the outlet temperature distribution factor rises from 0.068 to 0.438, the radial temperature distribution factor surges from 0.060 to 0.419, and the combustion efficiency decreases from 99.94% to 99.25%. As the cooling hole diameter increases, the average outlet temperature and combustion efficiency continuously decrease, and the temperature distribution at the outlet of the combustor gradually deteriorates. When the cooling hole angles are 20°, 40°, and 60°, the front section of the liner is directly impacted by high-temperature swirling gases, resulting in poor cooling effectiveness. However, effective cooling is achieved in the middle and rear sections of the liner, which forms a smooth and uniform temperature layer. When the cooling hole angle is 90°, vertically arranged cooling holes alleviate the issue of high-temperature swirling gases impacting the front section of the liner, but the cooling effect in the middle and rear sections of the liner significantly deteriorates. The research results may provide a certain reference for the design of divergent cooling structures in lean-burn premixed combustors.