完全氧化DZ125的双向反射特性实验研究  

Study on Reflection Characteristics of Completely Oxidized DZ125

作　　者：叶志鹏 赵树男 李勋锋[1,2,3] 淮秀兰 YE Zhi-peng;ZHAO Shu-nan;LI Xun-feng;HUAI Xiu-lan(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Nanjing Institute of Future Energy System,Chinese Academy of Sciences,Nanjing 211135,China;State Key Laboratory of Air-conditioning Equipment and System Energy Conservation,Gree Electric Appliances,Inc.of Zhuhai,Zhuhai 519070,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]中科南京未来能源系统研究院,江苏南京211135 [4]空调设备及系统运行节能国家重点实验室,珠海格力电器股份有限公司,广东珠海519070

出　　处：《光谱学与光谱分析》2023年第1期230-238,共9页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(52106117);中国科学院科研仪器设备研制项目(YJKYYQ20200016);国家科技重大专项(J2019-V-0006-0100)资助。

摘　　要：作为燃气轮机的核心部件,涡轮叶片长期在上千度的高温下工作,为了保证叶片安全可靠地运行,需要对其温度进行实时的监测。辐射测温是目前涡轮叶片非接触式测温的主流方法,其测温精度与叶片材料反射特性关系密切,如何预测不同方向反射能量的大小,减小反射辐射对测温结果的影响是目前研究的难点。为了预测叶片反射能量大小,提高辐射测温的准确性,对涡轮叶片常见材料——完全氧化DZ125的双向反射分布函数(BRDF)进行研究。采用对比法作为实验测量的方法,先分析了BRDF对比法测量原理及数据处理方法,之后自主搭建了试验台,在温度分别为25,900和1100℃,波长分别为1060,1550和1908 nm的条件下,控制入射天顶角及反射天顶角在0°~60°范围变化,方位角在0°~180°范围变化,测量计算出了多组BRDF值,分析了各种因素对完全氧化DZ125的BRDF的影响。最后采用Modified Phong模型对BRDF测量值进行了拟合,并与实验测量结果进行了对比,得到了较好的结果。研究结果表明,温度、波长对完全氧化DZ125的BRDF影响较小,在涡轮叶片工作的温度范围变化不大,辐射波长变化不大时,可忽略二者对BRDF的影响。而入射天顶角、反射天顶角与方位角对BRDF的影响很大,入射天顶角与反射天顶角大小越相近,方位角越接近180°,测量探头所处位置与镜面反射方向就越接近,试样的镜面反射特性就越显著,BRDF就越大;反之,当探头远离镜面反射方向,漫反射占据主导,BRDF将呈现快速的衰减。实验结果显示完全氧化DZ125具有很强的镜面反射特性。Modified Phong模型拟合得到的结果,能够较好地反映出完全氧化DZ125的双向反射特性。这一模型简单可靠,适用于后期采用蒙特卡罗方法进行数值模拟研究,以预测完全氧化DZ125材料的反射能量分布,为后续开展涡轮叶片辐射测温的研究提供理论基础。As the core component of a gas turbine,the turbine blade works at a high temperature of thousands of degrees for a long time.In order to ensure the safe and reliable bladeoperation,its temperature needs to be monitored in real-time.Radiation temperature measurement is currently the mainstream method of non-contact temperature measurement of gas turbine blades.Its temperature measurement accuracy is closely related to the reflection characteristics of blade materials.The difficulty of current research isto predict the reflected energy in different directions and reduce the impact of reflected radiation on temperature measurement.In order to predict the reflected energy of the turbine blade and improve the accuracy of radiation temperature measurement,the bidirectional reflection distribution function(BRDF)of completely oxidized DZ125,a common material of turbine blade,is studied in this paper.The reference method is used as the experimental measurement method.Firstly,the measurement principle and data processing method of the BRDF comparison method is analyzed.After that,the experiment platform was built independently.Under the conditions of 25,900 and 1100℃and wavelength of 1060,1550 and 1908 nm,the incident zenith angle and reflection zenith angle were controlled to change in the range of 0°to 60°,and the azimuth angle changed in the range of 0°to 180°.Several groups of the BRDF values were measured and calculated,and the effects of various factors on BRDF of completely oxidized DZ125 were analyzed.Finally,the modified Phong model is used to fit the measured values of BRDF.The fitting results can be accepted accordingto the comparison with the experimental results.The results show that temperature and wavelength have little effect on BRDF of fully oxidized DZ125.As long as the temperature range of the turbine blade and the radiation wavelength does not change strongly,the effect of both on BRDF can be ignored.The incident zenith angle,reflection zenith angle and azimuth angle greatly affect BRDF.The closer

关 键 词：完全氧化DZ125 对比法 双向反射分布函数 Modified Phong模型 

分 类 号：TK121[动力工程及工程热物理—工程热物理]