摘要
随着开采深度的不断加深,高温矿井中掘进工作面的热害日益突出,严重危害作业人员的身心健康.结合空气层在围护结构中保温隔热的作用,提出应用空气夹层控制围岩传热量的结构.采用理论分析、数值模拟相结合的方法,研究了同心环夹层结构自然对流的传热机理.利用ANSYS进行建模分析得出:在内外直径比接近1的水平同心环中,瑞利数Ra与空气自然流动形式的关系;用自然对流传热强化系数K表示自然对流对传热的强化程度,并拟合出环形空气层的平均K值与Ra的关系式为K_(ave)=0.091 63Ra^(0.2826),适用于矿井传热的自然对流传热强化系数计算公式为K_(m)=0.034 57Ra^(0.2917).并通过实例计算得到空气夹层厚度对散热量影响并不显著,最佳厚度为8 cm以内.
With the deepening of mining depth, the heat damage of the tunneling face in the high-temperature mine is increasingly prominent, which seriously endangers the physical and mental health of the workers. Combined with the effect of air layer on heat insulation in the building envelopes, a structure of controlling heat transfer from surrounding rock to roadway by air layer is proposed. Based on numerically simulating, the heat transfer mechanism of natural convection in concentric horizontal cylindrical annuli is studied. The relationship between Ra number and air flow characteristics is concluded with an internal and external diameter ratio close to 1. The enhancement degree of natural convection to heat transfer is expressed by the heat transfer enhancement coefficient K, the relationship between K average values of Ra is K;=0.091 63Ra;. And the formula that can be applied in the mine is K;=0.034 57Ra;. The calculation results of an engineering case show that the thickness of air interlayer has no significant effect on heat dissipation, and the optimal thickness is within 8 cm.
作者
李文菁
邹声华
杨万鑫
胡琦
LI Wenjing;ZOU Shenghua;YANG Wanxin;HU Qi(School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;School of Architectural Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)
出处
《矿业工程研究》
2021年第4期53-59,共7页
Mineral Engineering Research
基金
国家自然科学基金资助项目(51274098
51134005)
湖南省教育厅资助项目(21B0660)。
关键词
同心环夹层结构
自然对流强化系数
数值模拟
围岩传热量
concentric horizontal cylindrical annuli
natural convection heat transfer enhancement coefficient
numerically simulating
surrounding rock heat transfer
