本文選題：降溫特性 + 水膜板��； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：針對(duì)壁面熱流引起的高溫?zé)岷?wèn)題,本文提出冷壁降溫技術(shù)。能吸收壁面熱流的換熱器是冷壁降溫技術(shù)的核心部件,通過(guò)實(shí)驗(yàn)與數(shù)值模擬相結(jié)合的研究方法,對(duì)本文設(shè)計(jì)的水膜板換熱器進(jìn)行降溫特性參數(shù)實(shí)驗(yàn)研究。在搭建的模型巷道一側(cè)壁面貼附水膜板,水膜板覆蓋巷道表面占巷道壁面總面積25%,得出水膜板通水時(shí)的熱導(dǎo)率為0.01 W/(m·K),吸收貼附壁面熱流效率為85%,吸收系統(tǒng)總熱流效率為41%。鋪設(shè)隔熱材料可以起到降溫隔熱的效果,實(shí)驗(yàn)設(shè)計(jì)了六種工況進(jìn)行研究,巷道升溫方程一般形式皆為:T(t)=T_∞-(T_∞-T_0)×0.9980.1t。以巷道溫升降幅為分析參數(shù),比較各工況的實(shí)驗(yàn)結(jié)果發(fā)現(xiàn),單獨(dú)進(jìn)行隔熱降溫,巷道溫升降幅為13.4%;單獨(dú)進(jìn)行通水降溫,巷道溫升降幅為37.0%。單獨(dú)進(jìn)行隔熱降溫比單獨(dú)進(jìn)行通水降溫,巷道溫升降幅要低;即鋪設(shè)隔熱材料,又進(jìn)行通水降溫,巷道溫升降幅最大,為 41.7%。通過(guò)Fluent流體計(jì)算軟件,仿真模擬了水膜板換熱器降溫特性參數(shù)研究實(shí)驗(yàn),模擬結(jié)果與實(shí)際實(shí)驗(yàn)結(jié)果吻合度較高。數(shù)值模擬了通風(fēng)情況下,水膜板在模型巷道內(nèi)降溫效果,數(shù)值模擬發(fā)現(xiàn),增加通風(fēng)風(fēng)速和降低通風(fēng)風(fēng)溫,可以降低巷道內(nèi)空氣溫度,尤其是降低通風(fēng)風(fēng)溫降溫效果更明顯。對(duì)于實(shí)際煤礦巷道尺寸降溫?cái)?shù)值模擬探究,將水膜板模型簡(jiǎn)化處理,以水膜板實(shí)測(cè)數(shù)據(jù)指導(dǎo)仿真模擬是可行的。
[Abstract]:In order to solve the problem of high temperature heat damage caused by wall heat flux, this paper puts forward the cooling technology of cold wall. The heat exchanger which can absorb the heat flux from the wall is the core part of the cooling technology. Through the combination of experiment and numerical simulation, the cooling characteristic parameters of the water film plate heat exchanger designed in this paper are studied experimentally. The surface of the tunnel is covered by water film plate, which occupies 25% of the total area of the tunnel wall. The thermal conductivity of the water film plate is 0.01 W / m K ~ (+), the heat flux efficiency is 85%, and the total heat flux efficiency of the absorption system is 41%. The effect of laying heat insulation material on cooling and heat insulation can be achieved. Six working conditions have been designed and studied. The general equation of roadway temperature rise is: T鈭，

本文編號(hào)：1796760