为探究带沟槽叶片的颗粒沉积特性以及气膜冷却性能，以某型高压涡轮含有尾缘劈缝结构的涡轮叶片为原型，针对实际工况建立沉积模型，采用数值模拟方法研究了0<M≤2不同吹风比下沟槽结构对叶片表面颗粒沉积特性和叶片表面气膜冷却性能的影响规律。结果表明：沟槽结构提高了总碰撞效率，降低了总沉积效率，颗粒易沉积于气膜孔下游以外区域以及端壁两侧，沟槽导致压力面中后部颗粒沉积的区域增大；随着吹风比的增加，沟槽内部捕获效率提高，整体颗粒捕获效率降低，沟槽内部的气膜冷却性能不断下降，但沟槽下游部分区域的气膜冷却性能优于原始结构；沟槽的存在使下游附近沿展向的气膜覆盖区域变大，冷却性能提升，沿孔流向的展向平均气膜冷却效率最高可提升18%。

In order to investigate the particle deposition characteristics and film cooling performance of a blade with trench, a deposition model was established for a highpressure turbine blade with a trailing edge slot structure in accordance with actual operating conditions. The effect of trench structure under different blowing ratios 0<M≤2 on the particle deposition characteristics and film cooling performance of the blade surface was studied using numerical simulation methods. The results show that the trench structure improves the total impact efficiency and reduces the total deposition efficiency. Particles tend to deposit outside the downstream area of the gas film hole and on both sides of the end wall, and the trench results in an increase in the area of particle deposition in the middle and rear of the pressure surface; as the blowing ratio increases, the capture efficiency inside the trench increases, while the overall particle capture efficiency decreases. The film cooling performance inside the trench continues to decline, but the film cooling performance in some areas downstream of the trench is also better than the original structure; the presence of trench increases the spanwise film coverage area near the downstream and improves cooling performance. The spanwise average film cooling efficiency along the hole direction can be increased by up to 18%.

TK221

国家自然科学基金（52071107）；中国博士后科学基金（2019M661254，2021T140147）