地铁车站轨行区单向流通风排热稳态模拟研究
Steady-state simulation study of unidirectional flow ventilation for heat removal in track area of subway stations
摘要：
为解决工程实际中轨行区既有上排热系统各风口风速不均匀,影响排热效果的问题,提出了一侧送风、一侧排风的单向流通风排热方案。采用CFD数值模拟方法,在假定停站列车冷凝器持续放热前提下,对新旧排热方案下的温度场和通风排热效果进行了比较。结果显示:采用一侧送风、一侧排风的单向流通风方式,能够充分利用送风射流速度衰减缓慢的优势,提高轨行区的排热效率;整体来看,新型排热方案在列车中部区域的降温优势突出,能有效改善热量积聚问题,提升轨行区热环境质量。
Abstract：
To address the issue of uneven wind speeds at various outlets in the existing over-track heat removal system in the actual station track area, which affects the heat removal effect, this paper proposes a scheme of unidirectional flow ventilation for heat removal with air supply on one side and exhaust on the other side. Using CFD numerical simulation, this study compares the temperature field and ventilation heat removal effects under both the new and existing heat removal schemes, assuming continuous heat release from the condenser of stopped trains. The results show that adopting the unidirectional flow ventilation method with air supply on one side and exhaust on the other side can make full use of the advantage of slow attenuation of the air supply jet velocity to improve the heat removal efficiency in the track area. Overall, the new heat removal scheme has outstanding cooling advantages in the middle of the train, and can effectively improve the heat accumulation problem and the thermal environment quality in the track area.
Keywords:subway station; track area; unidirectional flow ventilation; heat removal; percentage reduction of cross-section temperature