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Numerical Simulation Analysis of Unsteady Temperature in Thermal Insulation Supporting Roadway

机译：隔热巷道不稳定温度的数值模拟分析

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摘要

High geothermal hazard is a basic problem that must be solved in deep mining; thereby the research on thermal insulation supporting for high temperature control of deep roadway is increasing. However, the quantitative analysis of its thermal insulation effect is yet to be carried out. By building the physical model and control equations of the thermal insulation supporting roadway and considering heat-humidity transfer at wall, the temperature field distribution of surrounding rock and airflow is numerically calculated. Based on numerical simulation results, the evolution law of temperature with ventilation time is analyzed at airflow inlet, outlet, and different sections, then the variation law of surface heat transfer coefficient with position and time is obtained. For heat insulation support structure, the results show that it is not obvious to change the distribution law of temperature field, but it is effective to weaken the convection heat transfer between surrounding rock and airflow. In the main airflow area, the rate of heat exchange gradually decreases with the heat exchange becoming more and more sufficient; in boundary layer, the airflow temperature quickly transits from the wall temperature to that of the main airflow area because of intense collisions of airflow masses, so the mechanism of temperature change is different. The surface heat transfer coefficient well reflected the unstable heat-humidity transfer, especially in the beginning of ventilation or at airflow inlet. Therefore, the heat insulation supporting structure is helpful to the auxiliary cooling of high temperature mine.
机译：高地热危害是一种基本问题，必须在深处解决;因此，对深道高温控制的热绝缘支护研究正在增加。然而，尚未进行其绝热效果的定量分析。通过构建热绝缘支撑巷道的物理模型和控制方程，考虑墙壁的热湿度转移，数值计算周围岩石和气流的温度场分布。基于数值模拟结果，在气流入口，出口和不同部分分析了通风时间的温度的演化规律，然后获得了具有位置和时间的表面传热系数的变化规律。对于隔热支撑结构，结果表明，改变温度场分布规律并不明显，但削弱周围岩石和气流之间的对流热传递是有效的。在主气流区域中，热交换速率随着热交换变得越来越充足而逐渐减小;在边界层中，由于气流块的强烈碰撞，气流温度迅速从壁温到主气流区域的温度过度，因此温度变化的机制不同。表面传热系数良好地反映了不稳定的热湿度转移，特别是在通风的开始或气流入口处。因此，隔热支撑结构有助于高温矿的辅助冷却。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第13期|6279164.1-6279164.8|共8页
  • 作者

    Zhang Shuguang; Lu Pingping; Wang Hongwei;

  • 作者单位

    Guilin Univ Technol Sch Civil & Architectural Engn Guilin 541000 Peoples R China|Guangxi Key Lab Geomech & Geotech Engn Guilin 541004 Peoples R China;

    Liaoning Tech Univ Sch Civil Engn Fuxing 123000 Peoples R China;

    Taiyuan Univ Technol Inst Sci & Technol Taiyuan 030024 Shanxi Peoples R China;

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