Optimal pitch angle of jet fans based on air age evaluation for highway tunnel ventilation

Zhao, Shanshan; Xue, Peng; Xie, Jingchao; Jiang, Zhenxiong; Liu, Jiaping

doi:10.1016/j.jweia.2022.105088

Cited by 11 publications

(2 citation statements)

References 30 publications

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“…Due to the blockage of tunnel equipment, collisions between airflow and tunnel walls and equipment can lead to the generation of the vortex. The pitch angle variation of the fan can accelerate the dispersion of pollutants in the vortex area [20]. This is due to the instability of fluid motion caused by the shear force generated by changes in flow velocity during airflow movement.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Tunnel Ventilation Considering the Air Leakage Mechanism of a Ventilation Duct

Chang,

Chai,

Ren

et al. 2024

Applied Sciences

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Ventilation problems are critical in tunnel engineering, and the loss of air volume in ventilation ducts is generally estimated using empirical methods. The air volume calculation makes it difficult to meet the accuracy requirements, resulting in resource waste or insufficient air supply. In this study, the forced ventilation system of the tunnel under construction was investigated based on the computational fluid dynamics method. The mechanism of air leakage on airflow distribution and pollutant transport in the tunnel is determined. Air leakage reduces the distribution peak of pollutants and effectively accelerates the emission of harmful gases. However, this effect decreases with distance from the air duct inlet. Through the calculation results of nearly one hundred models, it is found that the air leakage of the duct can be fitted by logarithmic function and verified by empirical equation. The matching degree between the fitting function of the model and the empirical equation depends on the length of the tunnel. On this basis, the calculation formula of effective air volume near the working face is derived. This study can be applied to the ventilation engineering of the tunnel under construction and provide a theoretical basis for the calculation of the effective air supply.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Tunnel Ventilation Considering the Air Leakage Mechanism of a Ventilation Duct

Chang,

Chai,

Ren

et al. 2024

Applied Sciences

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“…Recent research shows great value in the use of CFD models in assessing tunnel ventilation objectives under diverse scenarios [3][4][5][6][7]. A variety of CFD software packages is available to resolve the whole range of emerging issues, whereas Ansys Fluent is the most used fluid flow simulation module [8].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Numerical Methods Regarding the Backflow Investigation in Tunnels of Zentrum am Berg

Patsekha

Wei

Galler

2022

Berg Huettenmaenn Monatsh

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The efficiency of tunnel ventilation systems is commonly evaluated through numerical modelling. In this survey, two CFD models were developed by means of Fire Dynamic Simulator and Ansys Fluent software. The simulation results were used to assess the model performance in studying the backflow distribution in a real tunnel. A full-scale experiment to evaluate the ventilation conditions in the western railway tunnel was carried out in Zentrum am Berg. The velocity values were obtained for 90 examined points located at 10 cross-sections along a 100-meter tunnel part. The results showed good agreement in velocity variation trends from field measurements and those predicted by numerical models. At cross-sections more distant from the fan outlets, the FDS and Fluent models overestimated the flow velocities to a different extent. The simulated backflow development corresponds well to the observed three specified regions (initial, transitional, and developed) with distinctive flow structures. The FDS calculations confirmed the registered spontaneous changes in flow direction at points with a prevailed flow direction in the vicinity of the jet fans. Despite some discrepancies in results, the comparative analysis of two numerical models showed their applicability in the backflow investigation.

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An energy-saving photocatalytic self-cleaning coating for controlling air pollution in highway tunnels

Yang

Wang

Tang

et al. 2023

Construction and Building Materials

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Optimal pitch angle of jet fans based on air age evaluation for highway tunnel ventilation

Cited by 11 publications

References 30 publications

Numerical Simulation of Tunnel Ventilation Considering the Air Leakage Mechanism of a Ventilation Duct

Numerical Simulation of Tunnel Ventilation Considering the Air Leakage Mechanism of a Ventilation Duct

Comparative Analysis of Numerical Methods Regarding the Backflow Investigation in Tunnels of Zentrum am Berg

An energy-saving photocatalytic self-cleaning coating for controlling air pollution in highway tunnels

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