利用红外技术进行层板冷却特性实验研究

为了研究层板冷却特性,应用远红外热像测温技术,对一个真实尺寸的层板结构进行了实验.层板的气膜孔、绕流柱及冲击孔直径分别为0.,0.8,0.8 mm,内腔高及总板厚分别为0.8,2.6 mm,孔柱数比为1:4:1.为了准确测量表面温度,采用了高精度热电偶校正法,建立修正关系;为了描述层板综合冷却效率,采用热像数字信号运算法,直接进行数据处理.实验在高温亚声速风洞中进行,实验结果展示了冷却介质注射量对层板冷却特性的影响,证明远红外热像技术用来研究层板冷却特性是一种有效的方法. 

Experimental Investigation of the cooling performance of lamilloy using infrared thermal imaging technique

To investigate the cooling performance of laminated configuration,an infrared thermal imaging technique was used in the experiments with true size configuration.The diameters of film hole,columniation and impingement hole were 0.5,0.8 and 0.8mm respectively,the chamber height and total thickness of the configuration were 0.8 and 2.6mm respectively,the ratio of the hole and culmination was 1∶4∶1.To measure surface temperature exactly,a thermocouple with high accuracy was used,and a correction relationship was established.To describe the integral cooling effect,an algorithm of thermal imaging signal was used for processing image digital signal.The experiments were carried out at a hot gas wind tunnel,and the results present the influence of coolant injection rate on the cooling performance of the laminated configuration.It is demonstrated that the infrared thermal imaging technique is effective method to study cooling performance of laminated configurations.