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EFFECTIVE THERMOELASTIC PROPERTIES OF FLAT AND CURVED TRANSPIRATION COOLED MULTILAYER PLATES VIA HOMOGENIZATION

机译：均质化平板和弯曲蒸腾冷却多层板的有效热弹性能

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摘要

A multiscale approach based on the homogenization method of periodic material structures is developed here to predict the effective thermoelastic properties of heterogeneous porous materials. This method allows the calculation of effective equivalent properties either for each layer separately or for the multilayer of transpiration cooled multilayer plates. As gas turbine components are usually not flat, three different cooled plate designs - plane, convex and concave - are analyzed numerically. Effective Young and shear moduli as well as Poisson and thermal expansion coefficients are presented in detail for the reference fiat plate. Then for the curved plates, the most sensitive effective Young and shear moduli of the TBC layer are compared with the reference ones. The effect of the blowing ratio on the effective orthotropic stiffness properties is outlined. The influence of local geometrical imperfections of the cooling channel shapes on the effective thermoelastic properties of the TBC layer of flat plates is also discussed in detail.
机译：本文提出了一种基于周期性材料结构均质化方法的多尺度方法，以预测异质多孔材料的有效热弹性。该方法允许分别计算每一层或蒸腾冷却的多层板的多层的等效等效性能。由于燃气轮机部件通常不平坦，因此需要对三种不同的冷却板设计（平面，凸面和凹面）进行数值分析。详细介绍了参考平板的有效杨氏模量和剪切模量以及泊松和热膨胀系数。然后，对于弯曲板，将TBC层的最灵敏有效杨氏模量和剪切模量与参考模量进行比较。概述了吹风比对有效正交各向异性刚度特性的影响。还详细讨论了冷却通道形状的局部几何缺陷对平板TBC层的有效热弹性性能的影响。

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