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摘要 辐射器是热光伏系统（TPV）的主要部件之一，它的功能是能够产生与光伏电池匹配的热辐射能。随着TPV系统对效率要求的提高，辐射器的辐射特性研究逐渐成为研究的热点。本文通过理论分析和实验研究的方法研究了块状氧化铒选择性辐射器的光谱辐射特性。 首先，根据热辐射传输方程，分析了热辐射在样品内的传输过程，并建立了样品辐射强度关联式。联立导热与辐射耦合的能量守恒方程，求解出样品温度分布和辐射强度分布，并由此得到理论的光谱发射率值。 其次，采用机械球磨、干压成型和高温烧结的工艺流程，制备了不同原料配比和成型压力的块材氧化铒选择性辐射器，研究了高温烧结中升温程序对辐射器制备的影响，并优化了制备工艺。 最后，基于能量法，采用傅里叶红外光谱仪，在高温下对样品进行光谱发射率测量。结果表明，氧化铒辐射器具有明显的锐带发射特点。铒含量增加，一定程度上能增强辐射器的光谱发射率与辐射器效率，40%铒含量的辐射器在1141K温度下最高光谱发射率可达0.5以上；温度增加，能增强辐射器的光谱辐射功率，并极大地提高了辐射器的效率，30%铒含量的辐射器在1600K温度下效率可达16.6%。30944
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毕业论文关键词 氧化铒 选择性辐射器 光谱发射率 效率
Title Study on The Spectral Emission Properties of Erbium oxide-based Selective Emitters
Abstract Emitter is one of the important components of Thermophotovoltaic(TPV) energy conversion system，and it produces thermal energy which matches the photovoltaic cells. With the improvement of the TPV system’s efficiency, the study on emission properties is gradually becoming a hot spot. This paper described the spectral emission properties of bulk erbium oxide-based selective emitters in terms of theoretical analysis and experiment researching. Firstly, based on the heat radiative transfer equation, the process of the heat radiance transfer in the sample was analyzed and the relational of the radiative intensity was established. The temperature and intensity distribution was solved at the methods of simultaneous coupled conduction and radiation energy conservation equation. Then, theoretical spectral emissivity was calculated. Secondly, the bulk erbium oxide-based selective emitters of different weight ratio and pressure was prepared with the process of ball mill mixing, dry pressing, and high sintering. Then, the influence of temperature program in the process of high sintering to the sample was researched and preparation process was optimized. Lastly, based on the energy method, the spectral emissivity of the sample in high temperature was measured in terms of Fourier Transform Infrared Spectroscope(FTIR). The results showed that the sample has characteristics of a sharp band emission. The spectral emissivity and the efficiency of the emitter was enhanced with the rising of the erbium content at a certain extent, the maximum Mean spectral emissivity of the emitter with the erbium content 40% could be up to 0.5 at the temperature of 1141K.Besides, with the increase of temperature, the spectral radiative power would be strengthened. The efficiency of emitter would also be improved greatly, which could reach 16.6% at the temperature of 1600K with 30% erbium content.
Keywords erbium oxide selective emitter spectral emissivity efficiency
目次
1绪论1
1.1选题的科学意义与应用背景.1
1.2稀土选择性辐射器机理.1
1.3国内外稀土选择性辐射器研究现状.2
1.4本文研究主要内容.5
2光谱发射率模型建立.7
2.1选择性辐射器模型图和基本假设.7
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