In this paper, to demonstrate the deposition effects on cooling performance, the changing patterns of film cooling due to particle deposition are numerically investigated on a turbine vane that is cooled by an array of film-holes. The uniqueness of this work is addressing the cooling performance at an early deposition stage, in which deposits are relatively slight. The build-ups of the deposits are simulated by moving grid nodes on the wall boundaries. Results show that in addition to particle velocity, the blowing conditions and wall temperatures are two important factors to determine the deposition patterns. Increasing coolant-to-mainstream mass flow ratios and lowering wall temperatures can help inhibit the growth of deposits. In addition, the modifications of the vane profile due to incipient deposition are completely different from those with excessive deposition. Although flow fields are less sensitive to the early-stage deposits in the subsonic vane passage, cooling effectiveness is significantly changed and the changes are linked to the mass flow ratios. Compared to the cooling performance from a non-deposition case, reduced cooling performance due to incipient deposition is found at a low mass flow ratio of 1.09%, while cooling performance is improved at moderate and high mass flow ratios of 1.64% and 2.06%.

在本文中，为了证明沉积对冷却性能的影响，对由颗粒孔阵列冷却的涡轮叶片进行了数值研究，研究了由于颗粒沉积而引起的膜冷却变化模式。这项工作的独特之处在于解决了早期沉积阶段的冷却性能，该阶段的沉积物相对较少。通过在壁边界上移动网格节点来模拟沉积物的堆积。结果表明，除粒子速度外，吹塑条件和壁温也是决定沉积方式的两个重要因素。增大冷却剂与主流的质量比并降低壁温可以帮助抑制沉积物的生长。此外，由于初期沉积，叶片轮廓的变化与过度沉积时的变化完全不同。尽管流场对亚音速叶片通道中的早期沉积物不那么敏感，但冷却效率却发生了显着变化，并且这种变化与质量流率有关。与非沉积情况下的冷却性能相比，在1.09％的低质量流量比率下，由于初期沉积而导致的冷却性能下降，而在1.64％和2.06％的中等和高质量流量比率下，冷却性能得到改善。