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Analysis of Heat Transfer Characteristics of Fractured Surrounding Rock in Deep Underground Spaces

机译：深层地下空间围岩围岩传热特性分析

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摘要

The study of fluid-heat coupling in deep fractured surrounding rock is the basis of design, safety, and extraction of geothermal energy of deep underground spaces. The heat transfer and fractured media seepage theories were employed to establish a three-dimensional unsteady model for fluid-heat coupling heat transfer in fractured surrounding rock. Using COMSOL multiphysics simulation software, the temperature field of the fractured surrounding rock was determined. Furthermore, the influences of ventilation time, Darcy's velocity, fracture aperture, and thermal conductivity coefficient of the surrounding rock on the fractured surrounding rock temperature field distribution were investigated. The results of the numerical simulation show that the ventilation time and fracture have a major impact on the temperature field distribution of the fractured surrounding rock. As ventilation time is 200 days, an average water temperature in centerline of the fracture decreases 9.4K as Darcy's velocity increased from 3e-4m/s to 2e-3m/s. As ventilation time is 200 days, an average water temperature in centerline of the fracture decreases 5.3K as fracture aperture increased from 3mm to 9mm. A set of experimental devices for fluid-heat coupling heat transfer in surrounding rock with a single fracture was designed and built to validate the numerical simulation results. Numerical simulation results are, in general, in agreement with the experimental results.
机译：深骨折周围岩石中的流体热耦合的研究是深层地下空间地热能的设计，安全性和提取的基础。用于传热和裂缝介质渗流理论，用于建立一个三维非稳态模型，用于围岩围岩中的流体热耦合热传递。使用COMSOL Multiphysics仿真软件，确定了破裂周围岩石的温度场。此外，研究了通风时间，达西速度，断裂孔径和周围岩石对围岩周围岩石温度场分布的围岩的热导电系数的影响。数值模拟的结果表明，通风时间和裂缝对破裂周围岩石的温度场分布具有重大影响。随着通风时间为200天，随着达西的速度从3E-4M / s增加到2E-3M / s，裂缝中心线的平均水温降低了9.4K。随着通风时间为200天，裂缝中心线的平均水温降低5.3K，因为骨折孔径从3mm增加到9mm。设计并建造了一组用于围岩中的流体热耦合热传递的实验装置，并建造并构建以验证数值模拟结果。通常，数值模拟结果与实验结果一致。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第16期|1926728.1-1926728.11|共11页
  • 作者

    Chen Liu; Chu Yujie; Zhang Yu; Han Fei; Zhang Jie;

  • 作者单位

    Xian Univ Sci & Technol Energy Sch Yanta Rd Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Energy Sch Yanta Rd Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Energy Sch Yanta Rd Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Energy Sch Yanta Rd Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Energy Sch Yanta Rd Xian 710054 Shaanxi Peoples R China;

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