Infrared thermography has been successfully adopted in the field of flow diagnostics over the last decades. Detecting the laminar–turbulent boundary layer transition through variations in the convective heat transfer is one of the primary applications due to its impact on the aerodynamic performance. Recent developments in fast–response infrared cameras allow unsteady measurement of fast–moving surfaces and moving transition positions, which must consider the thermal responsiveness of the surface material. Experimental results on moving boundary layer transition positions are highly valuable in the design and optimization of airfoils or rotor blades in unsteady applications, for example regarding helicopter main rotors in forward flight. This review article summarizes recent developments in steady and unsteady infrared thermography, particularly focusing on the development of differential infrared thermography (DIT). The new methods have also led to advances in the analysis of u...

中文翻译：

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红外热像仪用于边界层过渡测量

在过去的几十年中，红外热成像技术已成功地应用于流量诊断领域。由于对空气动力学性能的影响，通过对流换热的变化检测层流-湍流边界层的过渡是主要应用之一。快速响应式红外热像仪的最新发展允许对快速移动的表面和移动的过渡位置进行不稳定的测量，这必须考虑表面材料的热响应性。运动边界层过渡位置的实验结果对于非稳定应用中的机翼或旋翼桨叶的设计和优化非常有价值，例如关于前向飞行的直升机主旋翼。这篇评论文章总结了稳态和非稳态红外热成像技术的最新进展，特别着重于差示红外热成像（DIT）的发展。这些新方法还导致了对U ...