Impacts of opening baffle of city road tunnels on natural ventilation performance

doi:10.1007/s11709-013-0194-x

Front Struc Civil Eng

2013, Vol. 7

Issue (1) : 55-61 https://doi.org/10.1007/s11709-013-0194-x

RESEARCH ARTICLE

Impacts of opening baffle of city road tunnels on natural ventilation performance

Weixiao YANG¹(

), Jincheng XING¹, Jianxing LI², Jihong LING¹, Haixian HAO¹, Zhiqiang YAN³

1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; 2. Tianjin Municipal Engineering Design & Research Znstitute, Tianjin 300051,China; 3. Beijing Capital Mining Engineering and Technology Co., Qian’an, Hebei 064404, China

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Abstract

Based on the opening baffle mode for natural ventilation of city road tunnels, this paper studies the impacts of opening baffle on natural ventilation performance by verifying numerical simulation through model tests. By analyzing the impacts of installation angle, dimension, location, and quantity of opening baffle on ventilation performance, the paper reached the conclusions as follows: 1) When installation angle is larger than 45° and tunnel ventilation is well operated, the baffle exhaust could increase by at least 30% compared to when there is no baffle. 2) The baffle reaches its optimal performance when the length of the baffle is equal to the width of the city road tunnels. 3) Baffle exhaust could increase by 30% when it is installed in the downstream of openings. 4) The performance of a single baffle is better than that of multiple baffles.

Keywords city road tunnel numerical simulation baffle top opening natural ventilation

Corresponding Author(s): YANG Weixiao,Email:wei.xiao2006@163.com

Issue Date: 05 March 2013

Cite this article:

Weixiao YANG,Jincheng XING,Jianxing LI, et al. Impacts of opening baffle of city road tunnels on natural ventilation performance[J]. Front Struc Civil Eng, 2013, 7(1): 55-61.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0194-x
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I1/55

Fig.1 Dimension of tunnel model (unit: m)

Fig.2 Comparison of experimental velocity and simulated velocity. (Positive values indicate outflows, and negative values indicate inflows)

Fig.3 Dimension of tunnel model (unit: m)

Tab.1 Dimensions of baffles with different installation angles

Fig.4 Diagrammatic sketch of baffles

Fig.5 Contours of static pressure

Fig.6 Velocity vectors colored by velocity magnitude

Fig.7 Impact of installation angle on exhaust volume

Fig.8 Location of baffles at the bottom of openings

Tab.2 Location of baffles

Fig.9 Changes in ventilation rate with the variations of baffles locations. (Note: when the distance between baffles and the upstream of openings is 0 cm, the openings only have inflows.)

Tab.3 Combination means for baffles

Fig.10 Changes in ventilation performance with baffle locations under different baffles distances. (Note: In working condition 1, the distance between two baffles is 30.8 cm. Air flows into openings, and the exhaust is zero.)

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