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Methods to Extract Underlying Boundary Conditions from Transient Metal Effectiveness Measurements
Journal of Thermophysics and Heat Transfer ( IF 2.1 ) Pub Date : 2021-07-30 , DOI: 10.2514/1.t6137
Mathias Michaud 1 , Thomas Povey 1
Affiliation  

Metal effectiveness measurements (or overall cooling effectiveness measurements) are becoming increasingly used to understand complex coupled systems in gas turbine experimental research. Unlike traditional techniques in which individual boundary conditions are measured in isolation and superposed using a thermal model, metal effectiveness measurements give the final result of a complex coupled system. In correctly scaled experiments this allows aerothermal performance at near-engine conditions to be evaluated directly, and is thus powerful both as a research technique and for derisking engine development programs. The technique is particularly useful for evaluating the thermal performance of internally cooled turbine components, because of the complexity and degree of interaction of the underlying boundary conditions. An intrinsic limitation of metal effectiveness measurement data is that the individual boundary conditions (e.g., the internal and external heat transfer coefficients) cannot be directly obtained from the final measurement. Decoupling of these boundary conditions would allow deeper understanding of the systems that are the subject of experiments. The objective of this paper is to present methods to extract the individual underlying boundary conditions from data available in typical metal effectiveness experimental measurements, and to assess the uncertainty associated with decoupling techniques. Although we reference experimental data from advanced facilities for metal effectiveness research throughout, much of the analysis is performed using a low-order heat transfer model to allow the impact of experiment design and measurement errors to be clearly separated at each stage of the analysis.



中文翻译:

从瞬态金属效率测量中提取潜在边界条件的方法

金属效率测量(或整体冷却效率测量)越来越多地用于理解燃气轮机实验研究中的复杂耦合系统。与单独测量单个边界条件并使用热模型叠加的传统技术不同,金属有效性测量给出了复杂耦合系统的最终结果。在正确缩放的实验中,这允许直接评估接近发动机条件下的空气热性能,因此作为研究技术和消除发动机开发计划的风险都很强大。由于基本边界条件的复杂性和相互作用程度,该技术对于评估内部冷却涡轮机部件的热性能特别有用。金属有效性测量数据的一个内在限制是单个边界条件(例如,内部和外部传热系数)不能直接从最终测量中获得。这些边界条件的解耦将允许更深入地了解作为实验主题的系统。本文的目的是介绍从典型金属有效性实验测量中可用的数据中提取各个潜在边界条件的方法,并评估与去耦技术相关的不确定性。尽管我们在整个过程中都参考了来自先进设施的实验数据以进行金属有效性研究,

更新日期:2021-08-01
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