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Experimental and Numerical Investigations on Turbine Airfoil Cooling Designs Part II-An Investigation on Heat Transfer Features by Infrared Thermal Imaging Technique

机译：涡轮机翼冷却设计的实验和数值研究第二部分-红外热成像技术对传热特性的研究

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摘要

Experimental and numerical investigations are conducted to understand the heat transfer characteristics of a double-wall film-cooled configuration. To validate the numerical method for describing the heat transfer process of the complex configuration, an infrared thermal imaging (ITI) system is used. Through the ITI system, two-dimensional temperature distributions over the coversheet of the configuration are captured. The experiments are carried out in a hot gas wind tunnel with an electrical heater of 30kW. The specimen used in the experiments has an actual size of gas turbine engines, and an integral structure of the coversheet and columnar ribs is processed by a numerically controlled milling machine. Numerical calculations are carried out by an alternant iteration algorithm between velocity field and temperature field, and the shear -stress-transport k-ω model and locally refined T-grid validated by the first part of this work are used. The numerical results are compared with the thermal image captured by the ITI system. The influences of coolant impingement and cross flow within the configuration, coolant film effect at the coversheet, heat conduction through the ribs on the overall cooling effectiveness at the coversheet are illustrated and discussed. The objective of this investigation is to provide a preparation for the next work, to estimate the thermal stress and reliability of the double-wall cooling configurations.
机译：进行实验和数值研究以了解双壁膜冷却配置的传热特性。为了验证用于描述复杂配置的传热过程的数值方法，使用了红外热成像（ITI）系统。通过ITI系统，可以捕获配置封面上的二维温度分布。实验是在带有30kW电加热器的热气风洞中进行的。实验中使用的样品具有燃气轮机的实际尺寸，并且盖板和圆柱肋的整体结构由数控铣床加工而成。通过速度场和温度场之间的交替迭代算法进行数值计算，并使用本文第一部分验证的剪切应力传输k-ω模型和局部精化的T型网格。将数值结果与ITI系统捕获的热图像进行比较。说明并讨论了配置中的冷却剂撞击和错流，盖板上的冷却剂薄膜效应，通过肋的热传导对盖板上的整体冷却效率的影响。这项研究的目的是为下一步工作做准备，以估算双壁冷却结构的热应力和可靠性。

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