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首页> 外文期刊>Journal of Heat Transfer >Discrete Green's Function Measurements in a Single Passage Turbine Model
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Discrete Green's Function Measurements in a Single Passage Turbine Model

机译：单通道涡轮模型中的离散格林函数测量

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The superposition-based Discrete Green's Function (DGF) technique provides a general representation of convective heat transfer that can capture the numerous flow and thermal complexities of the gas turbine environment and provide benchmark data for the validation of computational codes. The main advantages of the DGF technique are that the measurement apparatus is easier to fabricate than a uniform heat flux or uniform temperature surface, and that the results are applicable to any choice of discretized thermal boundary condition. Once determined for a specific flow condition, the DGF results can be used, for example, with measured surface temperature data to estimate the surface heat flux. In Ms study, the experimental DGF approach was extended to the suction side blade surface of a single passage model of a turbine cascade. Full-field thermal data were acquired using a steady state, liquid crystal-based imaging technique. The objective was to compute a 10X10 one-dimensional DGF matrix in a realistic turbomachinery geometry. The inverse 1-D DGF matrix, G~(-1), was calculated and its uncertainties estimated. The DGF-based predictions for the temperature rise and Stanton number distributions on a uniform heat flux surface were found to be in good agreement with experimental data. The G matrix obtained by a direct inversion of G~(-1) provided reasonable heat transfer predictions for standard thermal boundary conditions.
机译：基于叠加的离散格林函数（DGF）技术提供了对流传热的一般表示形式，该对流传热可以捕获燃气轮机环境的众多流动和热复杂性，并提供用于验证计算代码的基准数据。 DGF技术的主要优点在于，与均匀的热通量或均匀的温度表面相比，测量设备更易于制造，并且该结果适用于离散热边界条件的任何选择。一旦确定了特定的流动条件，就可以将DGF结果与测量的表面温度数据一起使用，以估算表面热通量。在女士研究中，实验性DGF方法扩展到了涡轮机级联单通道模型的吸力侧叶片表面。使用基于液晶的稳态成像技术获取全场热数据。目的是在现实的涡轮机械几何中计算10X10一维DGF矩阵。计算一维DGF逆矩阵G〜（-1）并估计其不确定性。发现基于DGF的均匀热通量表面上的温度上升和Stanton数分布的预测与实验数据非常吻合。通过直接反演G〜（-1）得到的G矩阵为标准热边界条件提供了合理的传热预测。

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