Experiments of combinational fans affecting smoke ceiling in an undersea metro interval tunnel VSES

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Ventilation Pub Date : 2021-06-30 DOI:10.1080/14733315.2021.1943922

Shi-qiang Chen, Siyu Fan, Ruohong Jin, Zhulong Zhu, Yihan Chen, Fangxing Chen, Haiqiao Wang

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Abstract

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.

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海底地铁区间隧道VSES组合通风机对烟顶影响试验

摘要以海底地铁区间隧道为例，提出了通风排烟系统(VSES)的评价模型。在VSES实验中，采集了车行道内风机的频率、功率、速度和静压数据，分别为TPTE(2个压入风机+ 2个抽出风机)、TPOEL(2个压入风机+ 1个抽出风机位于抽烟通风口左侧)和tpower(2个压入风机+ 1个抽烟风机位于抽烟通风口右侧)组合。结果表明:无论组合方式如何，两车道静压均存在波动现象和对称分布，其对称轴为烟顶;这些波动具有几乎恒定的静态压力，这与消耗功率的增加有关，而几乎不能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是必不可少的。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阻力对通过烟顶通风口气流的冲击损失最小。

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来源期刊

International Journal of Ventilation CONSTRUCTION & BUILDING TECHNOLOGY-ENERGY & FUELS

CiteScore

3.50

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： This is a peer reviewed journal aimed at providing the latest information on research and application. Topics include: • New ideas concerned with the development or application of ventilation; • Validated case studies demonstrating the performance of ventilation strategies; • Information on needs and solutions for specific building types including: offices, dwellings, schools, hospitals, parking garages, urban buildings and recreational buildings etc; • Developments in numerical methods; • Measurement techniques; • Related issues in which the impact of ventilation plays an important role (e.g. the interaction of ventilation with air quality, health and comfort); • Energy issues related to ventilation (e.g. low energy systems, ventilation heating and cooling loss); • Driving forces (weather data, fan performance etc).