本文關(guān)鍵詞：半透明固體材料高溫光譜輻射特性測(cè)量方法研究　出處：《南京理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 輻射特性參數(shù) 半透明材料 加熱裝置 光譜發(fā)射率

【摘要】：近年來,在航空航天、新能源、化工等多個(gè)領(lǐng)域,涉及到半透明固體材料的熱輻射傳輸過程。半透明材料的輻射傳熱,特別是高溫下半透明材料的輻射傳熱對(duì)于提高設(shè)備性能至關(guān)重要,如高溫燃?xì)廨啓C(jī)葉片熱防護(hù)涂層內(nèi)部的輻射導(dǎo)熱耦合換熱的研究對(duì)于涂層的生成,性能評(píng)估都十分重要,而半透明材料的輻射特性參數(shù)為輻射傳輸計(jì)算所必須的基本參數(shù)。本文針對(duì)半透明固體材料高溫光譜輻射特性的測(cè)量方法進(jìn)行了研究。首先,高溫下,通過分析材料內(nèi)部輻射傳輸過程,建立了光譜發(fā)射率與吸收、散射系數(shù)的關(guān)系。分析了考慮材料內(nèi)部散射影響時(shí),需結(jié)合材料高溫下的光譜發(fā)射率及常溫下的散射系數(shù),才能得到材料的吸收系數(shù)。建立了常溫下半透明固體材料的輻射特性測(cè)量方法,基于積分球測(cè)量實(shí)驗(yàn),反演得到材料的吸收、散射系數(shù)。其次,提出了半透明固體材料光譜發(fā)射率測(cè)量方法-移動(dòng)樣品法,介紹了雙基底法原理；建立了發(fā)射率測(cè)量原理公式；結(jié)合測(cè)量對(duì)象自身的特性,采用了Christiansen波長測(cè)溫與接觸測(cè)溫,并驗(yàn)證了Christiansen波長測(cè)溫的可行性。再次,研制了半透明固體材料高溫發(fā)射率測(cè)量系統(tǒng),設(shè)計(jì)了電加熱裝置,采用Fluent仿真模擬驗(yàn)證了此裝置加熱樣品的均勻性及溫度能達(dá)到預(yù)期要求。并進(jìn)行了SIC不透明樣品光譜發(fā)射率測(cè)量,其值與文獻(xiàn)吻合很好。同時(shí),基于移動(dòng)樣品法和雙基底法,分別采用電加熱和光譜儀附件A540裝置,以高純氧化鋁作為測(cè)試材料,進(jìn)行了100℃～700℃光譜發(fā)射率測(cè)量,將實(shí)驗(yàn)結(jié)果進(jìn)行了對(duì)比分析；并對(duì)測(cè)量系統(tǒng)進(jìn)行了不確定度分析。最后,分別就是否考慮材料內(nèi)部散射影響兩種情況,基于實(shí)驗(yàn)測(cè)量的材料高溫下的光譜發(fā)射率及常溫下反演得到的吸收、散射系數(shù),間接得到了材料高溫下的吸收系數(shù)。
[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，

本文編號(hào)：1422869