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目前在高地温隧道研究中，往往将高地温视为热害，缺乏将其作为地热能资源加以利用的相关研究。该文采用1∶30相似比缩尺设计并搭建了高地温隧道传热模型实验平台，平台包括模型试验箱、模型隧道、换热系统、加热系统、通风系统、渗流系统及数据采集系统，开展了不同通风风速、渗流温度与工质流速的试验。试验结果表明：风速在1～2 m/s内可增强换热；高温渗流可显著提升换热器的初期换热能力；工质流速的提升有利于提高换热效率，建议以0.6 m/s作为运行参数的优化参考。研究结果可为高地温隧道地热利用的设计提供理论依据与试验支撑。
Abstract：[Objective] With the increasing construction of deep and long tunnels, high geothermal environments have becomea criticalissueaffecting both construction safety and thermal comfort. Although such environments are often associated with thermal hazards, the stable geothermal potential of thesurrounding rock can be exploited as a renewable heat source. However, the thermal performance of ground heat exchangers(GHEs) in high-temperature tunnelsremainsinsufficientlyunderstood from anexperimental perspective. This study develops a scaled laboratory platform to investigate the coupled heat transfer behavior amongsurrounding rock, heat exchangers, and tunnel airflow. [Methods] A scaled experimental platform with a geometric scale ratio of 1 : 30 wasdesigned and constructed, consisting of a model test box, model tunnel, heat exchange system, heating system, ventilation system, seepage simulation system, and multipoint data acquisition system. This platform allowsforcontrolled simulation of coupled thermal processes under variable environmental conditions. Experiments wereconducted to evaluate the effects of ventilation speed(0 – 3 m/s), seepage water temperature(60 – 80 ℃), and working fluid velocity(0.4 – 0.8 m/s) on thermal performance. The outlet water temperature wasused as the primary indicatorofcoupledheat transfer behavior. [Results] The results showthat ventilation speed hasa noticeable influence on heat exchange: the outlet water temperature decreasessignificantly when the airflow speed exceeds 2 m/s. High-temperature seepage markedly increases the outlet temperature during the initial stage of heat exchange(e.g., seepage at 80 ℃ increased the outlet temperature by 87% comparedwith the no-seepage case).However,this effect gradually weakensdue tothe limited water retention of the surrounding rock. Increasing the working fluid velocity enhancesboth heat-exchange efficiency and system stability, with 0.6 m/s identified as the optimal operating parameter balancingthermal performance and energy efficiency. [Conclusions] This study experimentallyrevealshowventilation, seepage temperature, and fluid velocity influence the thermal performance of GHE systems in high-geothermal tunnels. The findings provide valuable guidancefor the design and operationof geothermalenergy utilization systems in underground engineering.
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基本信息:
DOI：10.16791/j.cnki.sjg.2025.11.005
中图分类号:U451
引用信息:
[1]闻毓民,曾艳华,邱宇航,等.高地温隧道围岩-换热器-风流耦合传热模型实验设计[J].实验技术与管理,2025,42(11):52-59.DOI:10.16791/j.cnki.sjg.2025.11.005.
基金信息:
国家重点研发计划(2021YFB2300906); 四川省高等教育人才培养质量和教学改革项目(JG2024-0344); 西南交通大学本科教育教学研究与改革项目(JG2024089)