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金属材料由于传热快,温度在短时间内容易达到热平衡。因此,用红外热像仪测量金属模型转捩难度大。在中国空气动力研究与发展中心(CARDC)Φ3.2 m低速风洞中,采用在金属模型表面喷涂隔热涂料的方法,用红外热像仪测量旋翼翼型的温度分布,通过温度跃变判断转捩位置。一般情况下,红外热像仪放置在试验段某个位置固定不动。模型改变攻角时,需要转动模型支撑机构,这样会造成红外图像中的模型位置发生改变,不利于比较不同攻角下的转捩位置。为解决该问题,在模型转动平台上设计了红外热像仪固定装置,实现了红外热像仪与模型的同步转动,解决了模型不同攻角状态下模型外形成像的差异问题。红外图像与实物坐标对应更为准确,获得的模型转捩位置更为精准。
Metal materials due to fast heat transfer, the temperature in a short time easy to reach thermal equilibrium. Therefore, it is very difficult to measure the metal model with the infrared camera. In the low-speed wind tunnel of Φ3.2 m in China Aerodynamic Research and Development Center (CARDC), a method of spraying thermal insulation coating on the surface of a metal mold is adopted, the temperature distribution of the rotor airfoil is measured by an infrared thermal imager, Turn 捩 position. Under normal circumstances, the thermal imaging camera placed in the test section of a fixed position. When the model changes the angle of attack, the model supporting mechanism needs to be rotated, thus changing the position of the model in the infrared image is not conducive to comparing the turning positions under different angles of attack. In order to solve this problem, an infrared camera fixing device is designed on the model rotating platform to realize the synchronous rotation of the infrared camera and the model, and to solve the problem of the difference of the imaging of the model under different angles of attack. The correspondence between the infrared image and the real object coordinate is more accurate, and the obtained model transition position is more accurate.