Influence of Spanwise and Streamwise Film Hole Spacing on Adiabatic Film Effectiveness for Effusion-Cooled Gas Turbine Blades
Influence of Spanwise and Streamwise Film Hole Spacing on Adiabatic Film Effectiveness for Effusion-Cooled Gas Turbine Blades
复制标题
翼展和流向膜孔间距对喷射冷却燃气轮机叶片绝热膜有效性的影响
DOI：
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发表时间：
2021
影响因子：
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通讯作者：
I. Mayo
中科院分区：
文献类型：
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作者：
M. Courtis;A. Murray;Ben Coulton;P. Ireland;I. Mayo
为了满足航空发动机涡轮机叶片热负荷和性能要求的提高，需要更先进的冷却技术。这项研究使用著名的Goldstein方程的修改来预测单个薄膜冷却孔的薄膜效率，并应用Sellers的叠加方法将这些薄膜应用于溢出冷却配置。在这样做时，它解决了一个相对没有挑战性的问题，薄膜孔在翼展方向接近。一个实验装置利用红外摄像机来评估不同展向和流向间距的九种几何形状的薄膜效率。更高的孔隙率导致增加的热保护，和展向间距有最深刻的影响，与膜的有效性接近0.9。此外，在展向方向上观察到更大的均匀性。改进的Goldstein-Sellers方法与实验结果吻合较好，但低估了侧向混合。该方法代表了一种可以在工业中轻松实施的工具，用于快速评估新型冷却几何形状。
To meet the challenges of increased thermal loads and performance demands on aero-engine turbine blades, more advanced cooling techniques are required. This study used a modification of the well-known Goldstein equation to predict film effectiveness for an individual film cooling hole and applied the Sellers’ superposition method to apply these films across effusion-cooled configurations. In doing so, it tackles a relatively unchallenged problem of film holes in close spanwise proximity. An experimental set-up utilised infrared cameras to assess the film effectiveness of nine geometries of varying spanwise and streamwise spacings. Higher porosity led to increased thermal protection, and the spanwise spacing had the most profound impact, with film effectiveness approaching 0.9. Additionally, greater uniformity in the spanwise direction was observed. The modified Goldstein-Sellers method showed good agreement with experimental results although lateral mixing was underestimated. This method represents a tool that could be easily implemented in the industry for rapid assessment of novel cooling geometries.