Robust Film Cooling Hole Shape Optimization Considering Surface Roughness and Partial Hole Blockage

Sanga Lee, W. Hwang, K. Yee
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引用次数: 3

Abstract

High performance film cooling holes with complicated geometries have been regarded as impractical up to now because of manufacturability issues. However, recent advances in additive manufacturing (AM) technology have opened up new doors. Investigating characteristics of film holes built with AM, and finding the optimum shape considering these characteristics are now required to confirm their practical utility. In this paper, the performance of a high-efficiency film hole is numerically investigated. In-hole roughness and blade surface roughness are examined assuming an AM process, and contorted hole shape caused by partial blockage is also considered. A robust hole shape is obtained considering these uncertainties, utilizing a reference hole shape made by combining three cylindrical holes. Hole diameter, injection angle, and two angles for defining the two auxiliary holes are used as design variables to be optimized. For flow field and thermal analysis with roughness, compressible steady Reynolds averaged Navier-Stokes equations with a sand-grain roughness model are used. For the probabilistic assessment of each hole shape, Monte Carlo Simulations with the Kriging surrogate model is used, along with efficient global optimization (EGO) and a genetic algorithm. As a result, a high performance yet robust film cooling hole shape is obtained.
考虑表面粗糙度和局部孔堵塞的鲁棒膜冷却孔形状优化
由于可制造性问题,复杂几何形状的高性能薄膜冷却孔一直被认为是不切实际的。然而,最近增材制造(AM)技术的进步打开了新的大门。研究用增材制造的膜孔的特性,并找到考虑这些特性的最佳形状,现在需要确认它们的实际用途。本文对高效膜孔的性能进行了数值研究。假设采用增材制造工艺,考察了孔内粗糙度和叶片表面粗糙度,并考虑了部分堵塞引起的孔形扭曲。考虑到这些不确定性,利用由三个圆柱形孔组合而成的参考孔形状获得了鲁棒孔形状。以孔径、注射角、确定两个辅助孔的两个角度作为优化设计变量。对于含粗糙度的流场和热分析,采用含沙粒粗糙度模型的可压缩稳态Reynolds平均Navier-Stokes方程。对于每个孔形状的概率评估,使用了带有Kriging代理模型的蒙特卡罗模拟,以及高效全局优化(EGO)和遗传算法。因此,获得了高性能且坚固的膜冷却孔形状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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