本文選題：光譜發(fā)射率 + 高溫　； 參考：《長(zhǎng)春理工大學(xué)》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?zé)嵛镄詤⒘恐?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(cè)溫、能源與節(jié)能、國(guó)防等領(lǐng)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(cè)量理論模型。建立了一個(gè)基于積分黑體方法測(cè)量高溫材料的光譜發(fā)射率的測(cè)量系統(tǒng)。該系統(tǒng)的實(shí)現(xiàn)基于一個(gè)優(yōu)化溫場(chǎng)的高溫變溫黑體輻射源,高溫樣品坩堝、高速氣動(dòng)活塞直線驅(qū)動(dòng)裝置,線性高溫計(jì)和光纖光譜儀、以及同步電路。開展復(fù)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(dòng)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(shí)基于輻射換熱網(wǎng)絡(luò)模擬溫度衰減特性的方法。實(shí)驗(yàn)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(yàn)證了本文建立的測(cè)量裝置及測(cè)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(hào)：1877735