壁面贴附水膜板换热器降温实验与数值模拟研究

发布时间：2018-04-24 13:07

  本文选题：降温特性 + 水膜板　； 参考：《中国矿业大学》2017年硕士论文

【摘要】：针对壁面热流引起的高温热害问题,本文提出冷壁降温技术。能吸收壁面热流的换热器是冷壁降温技术的核心部件,通过实验与数值模拟相结合的研究方法,对本文设计的水膜板换热器进行降温特性参数实验研究。在搭建的模型巷道一侧壁面贴附水膜板,水膜板覆盖巷道表面占巷道壁面总面积25%,得出水膜板通水时的热导率为0.01 W/(m·K),吸收贴附壁面热流效率为85%,吸收系统总热流效率为41%。铺设隔热材料可以起到降温隔热的效果,实验设计了六种工况进行研究,巷道升温方程一般形式皆为:T(t)=T_∞-(T_∞-T_0)×0.9980.1t。以巷道温升降幅为分析参数,比较各工况的实验结果发现,单独进行隔热降温,巷道温升降幅为13.4%;单独进行通水降温,巷道温升降幅为37.0%。单独进行隔热降温比单独进行通水降温,巷道温升降幅要低;即铺设隔热材料,又进行通水降温,巷道温升降幅最大,为 41.7%。通过Fluent流体计算软件,仿真模拟了水膜板换热器降温特性参数研究实验,模拟结果与实际实验结果吻合度较高。数值模拟了通风情况下,水膜板在模型巷道内降温效果,数值模拟发现,增加通风风速和降低通风风温,可以降低巷道内空气温度,尤其是降低通风风温降温效果更明显。对于实际煤矿巷道尺寸降温数值模拟探究,将水膜板模型简化处理,以水膜板实测数据指导仿真模拟是可行的。
[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，

本文编号：1796760