Influence of opening area ratio on natural ventilation in city tunnel under block transportation

Zhu, Pengxiao; Tong, Xiao-na; Chen, Lei; Wang, Chun-wang; Hua, Song; Li, Xiaoyun

doi:10.1016/j.scs.2015.07.015

Cited by 17 publications

(2 citation statements)

References 10 publications

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“…When the ventilation system works, the gas flow in the tunnel is generated by overcoming the internal wall friction under the pressure difference [36,37]. Therefore, the Reynolds number of the vent and the on-way resistance of the internal wall are the main similar parameters in this experiment.…”

Section: Similarity Verificationmentioning

confidence: 95%

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Zhang,

Lan

2023

Applied Sciences

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The ventilation system is the only channel for gas exchange inside and outside the gas tunnel, which determines whether the high-risk gas in the tunnel can be exhausted in time after a gas leakage accident; thus, it is essential to study the dynamic ventilation characteristics. A fire-retarding division of the gas tunnel in Songjiang District of Shanghai is taken as the study object, and, based on the similarity theory, a similarity experiment platform is built. The simulation experiments of exhaust are carried out under different exhaust velocities, ventilation equivalent diameters and initial gas concentrations by using the control variable method. The changes in ventilation duration and gas concentration are analyzed in detail. The conclusions are as follows: (1) Time–concentration curves at all positions in the gas tunnel exhibit an “asymptote” distribution. (2) Average gas concentration has a linear relationship with time at the beginning and becomes an exponential relationship after a certain time. (3) When the exhaust velocity is 5 m/s, the initial gas concentration is 15%VOL; when the equivalent diameter of the vent in the model is 0.2 m, the ventilation duration is 100.2 s. A calculation model of ventilation duration for the standard gas tunnel is established, and the application limits of the model are 1 ≤ v ≤ 5, 0.5 ≤ d ≤ 1.5, and 5 ≤ φo ≤ 25. (4) In practical engineering, an exhaust velocity of 5 m/s and an equivalent ventilation diameter of 1 m are relatively optimal ventilation parameters.

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Section: Similarity Verificationmentioning

confidence: 95%

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Zhang,

Lan

2023

Applied Sciences

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“…There are several requirements for MFI, regarding its structure, location, work control devices, air supply and pressure, the reversal of a ventilating stream, a way of aeration [7][8][9]. …”

Section: Introductionmentioning

confidence: 99%

Ejector fan installations used in mines of Russia

Alymenko¹,

Kamenskikh

Nikolaev

et al. 2017

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)

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Abstract-In the article, the options of mines aeration by means of ejector fan installation are examined, as well as the principle of this installation functioning and its potential are shown. Basing on the investigations conducted and the functioning results received, the possibility of application of the ejector fan installation as the main and auxiliary fan installation is shown. The application of the ejector fan installation as the main fan installation for aeration of the mines of the fields opened with adits or shafts of small extent on the northeast of Russia is proved. The option of using the ejector fan installation in the pit mouth as well as in underground stopings of the mine ventilating network is considered.Keywords-mine ventilating; main fan installations; ejector fan installations; underground mobile fan installation; aerodynamic drag

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Analysis of the correlation mechanism between geometric parameters and the thermal environment of Xi’an’s summer outdoor commercial pedestrian streets

Su,

Wang,

Xuan

et al. 2024

Int J Biometeorol

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Intensive urban development has resulted in the degradation of the urban thermal environment. Th ere is a growing consensus on the need to enhance urban thermal comfort through well-designed f orms, especially in open spaces like urban canyons. To address this, our study focuses on Xi'an's commercial pedestrian streets, employing K-means clustering analysis to create 32 representative models based on actual scenes, capturing their textural characteristics. Simultaneously, 11 geometri c indicators (2D/3D) were chosen to quantify the canyon's geometric form. We assessed the spatia l and temporal distribution differences in the thermal environment across these models using Envimet simulation. Finally, Spearman correlation analysis was employed to examine the correlation an d significance of the two sets of indicators, culminating in formulating an ideal model. The findin gs reveal that (1) wind conditions are predominantly influenced by the canyon's geometric form, f ollowed by solar radiation and temperature, with the lowest relative humidity change amplitude a mong the assessed thermal parameters. (2) Among the 11 geometric form indicators, 3D indicators correlate more significantly with thermal environment parameters than 2D indicators. Specifically, SO significantly impacts the thermal environment, P holds greater significance than De, and both BSC and BSR are significantly correlated with air temperature and wind speed, with a weaker co rrelation to solar radiation. (3) In the Xi'an region, courtyards oriented north-south demonstrate a more favorable trend in the thermal environment.

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Influence of opening area ratio on natural ventilation in city tunnel under block transportation

Cited by 17 publications

References 10 publications

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Experimental Study on Dynamic Exhaust Law for Ventilation System of Gas Tunnel

Ejector fan installations used in mines of Russia

Analysis of the correlation mechanism between geometric parameters and the thermal environment of Xi’an’s summer outdoor commercial pedestrian streets

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