Common services tunnel is one of the successful applications for increase the resilience of urban utilities and infrastructure. In its isolated environment, the massive transport energy resources bring about a relatively high risk of thermal disaster. Characteristics of ceiling gas temperature is very important for early-phase detecting and controlling of the abnormal heat release. This paper presents a numerical investigation on the propagation of ceiling gas temperature of thermal plume in a common services tunnel, especially focuses on the influence of the isolated closed-end, which causes significant difference from the traffic tunnel. Results show that for the closed-end tunnel, due to the asymmetrical air supplementation, the vertical plume inclines to the closed side and thicker thermal layer accumulates in the closed area. Ceiling temperature profile behaves differently with different energy source locations, the influence strength of the closed end can be divided into the far-field and near-field region. In the near-field region, the restricted thermal plume flows back and is directly entrained into the thermal layer, thus the nearer to the closed end, the higher of the maximum ceiling temperature, T_max. While in the far-field region, the energy source is relatively farther away from the closed end, T_max becomes constant with different energy source locations, which is also indicated in previous full-scale experiments. Besides, predictive correlations of the maximum ceiling temperature are proposed for energy source in far-field and near-field region, respectively. And the applicability of the proposed correlations is validated by comparing to the previous works.

公共服务隧道是提高城市公用事业和基础设施弹性的成功应用之一。在其孤立的环境中，大量的运输能源资源带来了相对较高的热灾风险。天花板气体温度的特性对于早期检测和控制异常放热非常重要。本文对一条公共服务隧道中的热羽顶气温度传播进行了数值研究，特别是隔离端封闭的影响，这与交通隧道产生了显着差异。结果表明，对于封闭式隧道，由于不对称的空气补充，垂直羽流向封闭侧倾斜，并且较厚的热层聚集在封闭区域中。天花板温度曲线随能源位置的不同而不同，封闭端的影响强度可分为远场和近场区域。在近场区域，受限制的热羽流回流并直接夹带到热层中，因此，靠近封闭端时，最高天花板温度越高，Ť_最大。在远场区域中，能源距离封闭端相对较远，而在不同的能源位置，T _max变得恒定，这在先前的全面实验中也已表明。此外，分别提出了远场和近场区域能源最高最高温度的预测相关性。通过与以前的工作进行比较，验证了所提出的相关性的适用性。