旋流燃烧室不同孔型发散冷却特性的对比

Numerical and experimental studies on the heat transfer characteristics of different effusion cooling hole configurations under swirl impact were carried out in a swirl-stabilized model combustor. The influences of hole configuration and blowing ratio on cooling performance were investigated by steady-state liquid crystal temperature measurement technology. Based on the steady-state numerical simulation, the comparative analysis of the cooling air near the wall was performed for different hole configurations. The experiment results showed that the distribution characteristics of the cooling effectiveness of the fan-shaped hole were basically the same as those of the cylindrical holes, but the average cooling effectiveness of the area was about 40% higher. Compared with the cylindrical holes, the cooling air flow of fan-shaped holes was more susceptible to the impact of swirling flows, such that the improvement of cooling efficiency was more sensitive to the change of blowing ratio and position. The numerical results showed that the fan-shaped hole had better cooling film coverage and more cooling air mass flow in the corner recirculation zone, and the cooling effectiveness was the highest than that of the cylindrical hole (the cooling effectiveness can be increased by about 80% at most). However, the cooling air mass flow of the fan-shaped hole in the impact zone was more obviously inhibited by the swirling flows, and the improvement of cooling effectiveness was not obvious.