本文選題：光譜發(fā)射率 + 高溫　； 參考：《長春理工大學》2017年碩士論文

【摘要】：材料的高溫光譜發(fā)射率為材料最重要的高溫熱物性參量之一,是影響高溫條件下物體熱輻射能力和它的光譜分布、物體之間熱輻射交換量的主要參數(shù),在航空航天、輻射測溫、能源與節(jié)能、國防等領域存在迫切的需求。本文研究了包括背景輻射、黑體有效發(fā)射率、黑體溫度、樣片外推溫降的高溫發(fā)射率測量理論模型。建立了一個基于積分黑體方法測量高溫材料的光譜發(fā)射率的測量系統(tǒng)。該系統(tǒng)的實現(xiàn)基于一個優(yōu)化溫場的高溫變溫黑體輻射源,高溫樣品坩堝、高速氣動活塞直線驅動裝置,線性高溫計和光纖光譜儀、以及同步電路。開展復雜傳熱邊界條件下,高溫樣品在高速直線位移過程中的溫度動態(tài)變化數(shù)值模擬,提出了將加熱管離散化為若干等溫圓柱環(huán),同時基于輻射換熱網(wǎng)絡模擬溫度衰減特性的方法。實驗研究了石墨材料樣品在1000℃、1300℃和1500℃高溫下的光譜發(fā)射率特性,驗證了本文建立的測量裝置及測量方法的有效性。
[Abstract]:The high temperature spectral emissivity of the material is one of the most important parameters of the material's thermal properties at high temperature. It affects the thermal radiation capacity of the object and its spectral distribution at high temperature, the main parameters of the heat radiation exchange amount between the objects, and the measurement of the radiation temperature in aerospace, radiation and temperature measurement. Energy and energy conservation, national defense and other areas of urgent demand. In this paper, a theoretical model of high temperature emissivity measurement including background radiation, blackbody effective emissivity, blackbody temperature and sample extrapolation temperature drop is studied. A system for measuring spectral emissivity of high temperature materials based on integral blackbody method is established. The realization of the system is based on a blackbody radiation source with optimized temperature field, a high temperature sample crucible, a high-speed pneumatic piston linear drive device, a linear pyrometer and optical fiber spectrometer, and a synchronous circuit. The numerical simulation of temperature dynamic change of high temperature samples during high speed linear displacement under complex heat transfer boundary conditions is carried out, and the discretization of heating tubes into isothermal cylindrical rings is proposed. At the same time, the method of simulating temperature attenuation based on radiative heat transfer network is presented. The spectral emissivity characteristics of graphite samples at 1000 鈩，

本文編號：1877735