Abstract

Based on a case study of the undersea metro interval tunnel, this study proposes a model to evaluate the Ventilation and Smoke Exhaust System (VSES). In the VSES experiments, data of fan frequencies, powers, velocities, and static pressures in carriageways are collected, under the TPTE (Two Pressing-in fans + Two Extracted-out fans), the TPOEL (Two Pressing-in fans + One Extraction fan on the Left side of a smoke ceiling vent) and the TPOER (Two Pressing-in fans + One Extraction fan on the Right side of a smoke ceiling vent) combinations. The results show that the static pressures in both carriageways have fluctuation phenomena and symmetrical distributions, whose axis of symmetry is the smoke ceiling, regardless of combination type. These fluctuations have almost constant static pressures, which are associated with the increase in consumed powers while hardly compensate for the increase in volume flow rates. These rare compensations are essential to evaluate the effects of combinations on the relative shock loss. In order to quantify the differences, this study proposes a VSES performance and a deviation percentage model, and the results show that the TPTE resistance has the smallest shock losses of airflow going through the smoke ceiling vent.

摘要

基于海底地铁区间隧道的案例研究，本研究提出了一个模型来评估通风和排烟系统 (VSES)。在 VSES 实验中，在 TPTE（两个压入风扇 + 两个抽出风扇）、TPOEL（两个压入风扇 + 一个抽出）下，收集了车道上风扇频率、功率、速度和静压的数据排烟天花板通风口左侧的风扇）和 TPOER（两个压入式风扇 + 排烟天花板通风口右侧的一个抽风机）组合。结果表明，无论组合方式如何，两条车道静压均存在波动现象，呈对称分布，其对称轴为烟顶。这些波动具有几乎恒定的静压，这与消耗功率的增加有关，但很难补偿体积流量的增加。这些罕见的补偿对于评估组合对相对冲击损失的影响至关重要。为了量化差异，本研究提出了 VSES 性能和偏差百分比模型，结果表明，TPTE 阻力具有最小的气流通过烟雾天花板通风口的冲击损失。