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Predicting the thermal conductivity of AlSi/polyester abradable coatings: effects of the numerical method

机译：预测AlSi /聚酯耐磨涂层的热导率：数值方法的影响

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摘要

The final target of this study was to achieve a better understanding of the behaviour of thermally sprayed abradable seals such as AlSi/polyester composites. These coatings are used as seals between the static and rotating parts in gas turbine applications. The machinability of the composite coatings during the friction of the blades depends on their mechanical and thermal effective properties. In order to predict these properties from micrographs, numerical studies were performed with different software packages such as OOF developed by NIST and TS2C developed at the UTBM. In 2008, differences were reported concerning prediction of effective thermal conductivity obtained with the two codes. In the present paper, it is shown that a particular attention must be paid to the mathematical formulation of the problem. In particular, results obtained with a finite difference method using a cell centre approach or a nodal formulation, allow explaining the discrepancies previously noticed. A comparison of the predictions of computed effective thermal conductivities is thus proposed for different codes and different meshing methods. This study is part of the NEWAC project, funded by the European Commission within the 6th RTD Framework programm (FP6).
机译：这项研究的最终目标是更好地了解热喷涂耐磨密封件（例如AlSi /聚酯复合材料）的性能。这些涂层在燃气轮机应用中用作静态和旋转部件之间的密封。叶片摩擦过程中复合涂层的可加工性取决于其机械和热有效性能。为了从显微照片预测这些特性，使用了不同的软件包，例如NIST开发的OOF和UTBM开发的TS2C，进行了数值研究。在2008年，报道了关于通过两个规范获得的有效导热系数的预测差异。在本文中，表明必须特别注意问题的数学表述。尤其是，使用单元中心方法或节点公式的有限差分法获得的结果可以解释先前发现的差异。因此，针对不同的代码和不同的网格划分方法，建议对计算出的有效热导率的预测值进行比较。这项研究是NEWAC项目的一部分，该项目由欧盟委员会在第六个RTD框架计划（FP6）中资助。

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