涡轮叶片发射率测量  

Turbine blade emissivity measurement

作　　者：冯驰[1] 刘思源 FENG Chi;LIU Si-yuan(School of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学信息与通信工程学院,哈尔滨150001

出　　处：《哈尔滨商业大学学报（自然科学版）》2020年第5期576-581,共6页Journal of Harbin University of Commerce：Natural Sciences Edition

摘　　要：涡轮叶片表面发射率的不确定性,极大的影响了辐射测温的精度.目前的高压涡轮叶片在设计时,为降低涡轮叶片表面温度,延长叶片使用寿命,通常会在叶片表面喷涂陶瓷隔热材料,这种热障涂层的厚度、成分等的细微变化,都会对涡轮叶片表面发射率造成显著影响.实验通过设计制备无涂层、35、70、150μm,四种涂层厚度样片,结合傅里叶红外光谱仪,测量了样片温度范围在500~750℃和光谱波长在1.2~2.4μm的发射率.实验结果表明,涂覆热障涂层的叶片表面发射率远低于无涂层的叶片基底,随着温度的升高,叶片表面发射率呈上升趋势.在同一温度下,叶片表面发射率与波长成正相关.通过发射率数据拟合,得到有涂层叶片表面的发射率模型参数.The uncertainty of the surface emissivity of the turbine blade greatly affects the accuracy of the radiation temperature measurement.At present,high-pressure turbine blades are designed to reduce the surface temperature of the turbine blades and extend the service life of the blades.Usually,ceramic insulation materials are sprayed on the surface of the blades.The thickness and composition of the thermal barrier coatings will vary slightly.The surface emissivity of the blade has a significant effect.The experiment was designed to prepare uncoated,35μm,70μm,150μm,four coating state samples,combined with Fourier infrared spectrometer,measured the sample temperature range of 500~750℃and the spectral wavelength of 1.2~2.4μm emissivity.The experimental results showed that the surface emissivity of the coated thermal barrier coating was much lower than that of the uncoated blade substrate.With the increase of temperature,the surface emissivity of the blade increases.At the same temperature,the surface emissivity of the blade was positively correlated with the wavelength.The emissivity model parameters of the coated blade surface were obtained by fitting the emissivity data.

关 键 词：热障涂层 发射率 傅里叶红外光谱仪 涂层厚度 数据拟合 辐射测温 黑体辐射 

分 类 号：TG157[金属学及工艺—热处理]