Theoretical model and numerical investigation of ventilation efficiency and pollution characteristics of multi gaseous pollutants in construction tunnel

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics Pub Date : 2025-04-29 DOI:10.1016/j.jweia.2025.106115

Zhuwei Xie , Dingfu Li , Yimin Xiao , Huijun Wu

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引用次数: 0

Abstract

Gaseous pollutants (CO, gas, etc.) generated from underground construction tunnels threaten the safety and health of workers, which goes against the concept of green and sustainable development. To efficiently relieve the air pollution in construction tunnel environments, this study innovatively proposed an exhaust factor ventilation model that considered non-uniform mixing of pollutants to characterize the ventilation efficiency of different gaseous pollutants. Subsequently, the airflow distribution and pollution characteristics of gaseous pollutants under different air duct diameters were investigated in depth by combining the exhaust factor ventilation model and numerical simulation. The results demonstrated that the release mode of pollutants affected the spatiotemporal diffusion characteristics of pollutants, where the diffusion distance of CO exhibited a linear function over time, while the diffusion distance of gas exhibited a cubic polynomial function over time. Moreover, the continuously released pollutant had superior ventilation efficiency compared to the one-time produced pollutant, where the exhaust factor of gas was 0.9787–1.0508, which was higher than that of CO (0.5425–0.6815). Furthermore, air duct diameter played a crucial role in improving the control effect of gaseous pollutants without increasing additional costs, as evidenced by an increasing trend in ventilation efficiency, a decreasing trend in CO clearance time and gas volume fraction with an increase in air duct diameter. This research can provide new insights for the control and treatment of gaseous pollutants in construction tunnel environments.

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施工隧道中多种气态污染物通风效率及污染特性的理论模型与数值研究

地下施工隧道产生的气体污染物（CO、气体等）威胁着工人的安全和健康，违背了绿色可持续发展的理念。为了有效缓解施工隧道环境中的空气污染，本研究创新性地提出了考虑污染物不均匀混合的排风因子通风模型，以表征不同气态污染物的通风效率。随后，将排风因子通风模型与数值模拟相结合，深入研究了不同风管直径下气态污染物的气流分布及污染特性。结果表明，污染物的释放方式影响污染物的时空扩散特征，其中CO的扩散距离随时间呈线性函数，而气体的扩散距离随时间呈三次多项式函数。连续释放污染物的通风效率优于一次性产生污染物，其中气体的排气系数为0.9787-1.0508，高于CO的排气系数（0.5425-0.6815）。此外，在不增加额外成本的情况下，风管直径在提高气体污染物控制效果方面发挥了至关重要的作用，随着风管直径的增加，通风效率呈上升趋势，CO清除时间和气体体积分数呈下降趋势。该研究可为施工隧道环境中气态污染物的控制与治理提供新的思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Wind Engineering and Industrial Aerodynamics 工程技术-工程：土木

CiteScore

8.90

自引率

22.90%

发文量

306

审稿时长

4.4 months

期刊介绍： The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.