This paper presents two-dimensional heat transfer results for the first time in an expansion tube, using infrared thermography at a Mars entry condition. Experiments were performed in the X2 expansion tube at The University of Queensland in a Martian (${\mathrm{CO}}_2/{\mathrm{N}}_2$) test gas on a wedge model. Infrared filtering from 3.5 to $4\mu \mathrm{m}$ was performed in data acquisition to remove significant radiation from the shock layer. Thermal images of a preheated surface from the infrared camera were used together with measurements from a fast response infrared sensor to obtain heat flux maps at a hypervelocity condition with flight duplicated enthalpy. Experimental heat flux results have an uncertainty of less than 10% and agreed with laminar convective theoretical correlations to within 16%, making thermography suitable for heat transfer measurements in expansion tubes. This technique has potential for future applications in studying wall/near-wall viscous phenomena dependent on surface temperatures in expansion tubes.

本文首次展示了膨胀管中的二维传热结果，在火星进入条件下使用红外热成像。实验是在昆士兰大学的 X2 膨胀管中在火星上进行的（${\mathrm{二氧化碳}}_2/{\mathrm{N}}_2$) 楔形模型上的测试气体。红外过滤从 3.5 到$4\mu \mathrm{米}$在数据采集中进行，以消除激波层的显着辐射。来自红外相机的预热表面的热图像与来自快速响应红外传感器的测量值一起使用，以获得具有飞行重复焓的超高速条件下的热通量图。实验热通量结果的不确定性小于 10%，并且与层流对流理论相关性一致，误差在 16% 以内，使热成像适用于膨胀管中的传热测量。该技术在研究取决于膨胀管表面温度的壁面/近壁面粘性现象方面具有未来应用的潜力。