半透明固体材料高温光谱辐射特性测量方法研究

发布时间：2018-01-14 08:40

  本文关键词：半透明固体材料高温光谱辐射特性测量方法研究　出处：《南京理工大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 辐射特性参数 半透明材料 加热装置 光谱发射率

【摘要】：近年来,在航空航天、新能源、化工等多个领域,涉及到半透明固体材料的热辐射传输过程。半透明材料的辐射传热,特别是高温下半透明材料的辐射传热对于提高设备性能至关重要,如高温燃气轮机叶片热防护涂层内部的辐射导热耦合换热的研究对于涂层的生成,性能评估都十分重要,而半透明材料的辐射特性参数为辐射传输计算所必须的基本参数。本文针对半透明固体材料高温光谱辐射特性的测量方法进行了研究。首先,高温下,通过分析材料内部辐射传输过程,建立了光谱发射率与吸收、散射系数的关系。分析了考虑材料内部散射影响时,需结合材料高温下的光谱发射率及常温下的散射系数,才能得到材料的吸收系数。建立了常温下半透明固体材料的辐射特性测量方法,基于积分球测量实验,反演得到材料的吸收、散射系数。其次,提出了半透明固体材料光谱发射率测量方法-移动样品法,介绍了双基底法原理；建立了发射率测量原理公式；结合测量对象自身的特性,采用了Christiansen波长测温与接触测温,并验证了Christiansen波长测温的可行性。再次,研制了半透明固体材料高温发射率测量系统,设计了电加热装置,采用Fluent仿真模拟验证了此装置加热样品的均匀性及温度能达到预期要求。并进行了SIC不透明样品光谱发射率测量,其值与文献吻合很好。同时,基于移动样品法和双基底法,分别采用电加热和光谱仪附件A540装置,以高纯氧化铝作为测试材料,进行了100℃～700℃光谱发射率测量,将实验结果进行了对比分析；并对测量系统进行了不确定度分析。最后,分别就是否考虑材料内部散射影响两种情况,基于实验测量的材料高温下的光谱发射率及常温下反演得到的吸收、散射系数,间接得到了材料高温下的吸收系数。
[Abstract]:In recent years, in many fields such as aerospace, new energy, chemical industry and so on, it involves the heat radiation transfer process of semitransparent solid materials and the radiative heat transfer of translucent materials. Especially, the radiative heat transfer of translucent materials at high temperature is very important to improve the performance of the equipment. For example, the study of radiation heat transfer coupling heat transfer inside the thermal protection coating of high temperature gas turbine blade is very important to the formation of the coating. Performance evaluation is important. The radiation characteristic parameters of translucent materials are the basic parameters necessary for radiative transfer calculation. In this paper, the measurement method of high temperature spectral radiation characteristics of semitransparent solid materials is studied. First, at high temperature. The relationship between spectral emissivity, absorption and scattering coefficient is established by analyzing the radiation transfer process in the material, and the influence of internal scattering is analyzed. The absorption coefficient of the material can be obtained by combining the spectral emissivity of the material at high temperature and the scattering coefficient at normal temperature. A method for measuring the radiation characteristics of semitransparent solid materials at room temperature is established, and the measurement method is based on the integral sphere measurement experiment. The absorption and scattering coefficients of the material are obtained by inversion. Secondly, the method of measurement of spectral emissivity of semitransparent solid materials, moving sample method, is proposed, and the principle of bistatic bottom method is introduced. The principle formula of emissivity measurement is established. Combined with the characteristics of the object, the Christiansen wavelength temperature measurement and contact temperature measurement are adopted, and the feasibility of Christiansen wavelength temperature measurement is verified. A high temperature emissivity measurement system for semitransparent solid materials was developed and an electric heating device was designed. The uniformity and temperature of the heating samples are verified by Fluent simulation. The spectral emissivity of SIC opaque samples is measured and the values are in good agreement with the literature. Based on moving sample method and double base bottom method, the spectral emissivity was measured at 100 鈩，

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