A Comparative Analysis of the Performance Differences Between Conventional and Annular Jet Ventilation Systems in Pollutant Removal in a Cable Maintenance Manhole

Xukun Lin; Qinghai Yang; Yiyang Fu; Liuyi Chen; Yuxue Ren; Shuhan Wang; Ling Wang; He Li

doi:10.2991/978-94-6463-856-1_35

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A Comparative Analysis of the Performance Differences Between Conventional and Annular Jet Ventilation Systems in Pollutant Removal in a Cable Maintenance Manhole

Authors

Xukun Lin¹, Qinghai Yang², Yiyang Fu², Liuyi Chen², Yuxue Ren³, Shuhan Wang⁴, Ling Wang⁴, He Li¹^{, *}

¹School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China

²State Grid Shanghai Municipal Electric Power Company, Shanghai, 201899, China

³Donghua University, Shanghai, 201620, China

⁴State Grid Shanghai Cable Company, Shanghai, 200072, China

^*Corresponding author. Email: liheoffice@usst.edu.cn

Corresponding Author

He Li

Available Online 22 September 2025.

DOI: 10.2991/978-94-6463-856-1_35 How to use a DOI?
Keywords: Annular jet ventilation device; Aable maintenance manhole; Coanda effect; CFD
Abstract: Ensuring a safe working environment within underground cable maintenance manholes is critical due to the frequent accumulation of hazardous gases, such as ammonia (NH₃), which pose significant health risks. This study proposes a novel annular jet ventilation system and evaluates its pollutant removal performance compared to conventional ventilation methods. Using Computational Fluid Dynamics (CFD) simulations based on the finite volume method and the RNG k-ε turbulence model, the airflow distribution and contaminant dilution behavior inside a standard cable manhole were analyzed. Results show that, despite a design airflow rate of only 16.6% of the conventional system, the annular jet device achieves an effective airflow output 7.8 times greater, owing to Coandă effect-induced entrainment. Furthermore, the annular jet system reduces NH₃ concentrations to safe levels within 90 seconds, significantly outperforming the traditional setup in both efficiency and coverage. With a compact, duct-free structure and low energy demand, the proposed system offers an innovative and practical solution for enhancing ventilation safety in confined underground environments.
Open Access: Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title: Proceedings of the 2025 International Conference on Resilient City and Safety Engineering (ICRCSE 2025)
Series: Advances in Engineering Research
Publication Date: 22 September 2025
ISBN: 978-94-6463-856-1
ISSN: 2352-5401
DOI: 10.2991/978-94-6463-856-1_35 How to use a DOI?
Open Access: Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

ris enw bib

TY  - CONF
AU  - Xukun Lin
AU  - Qinghai Yang
AU  - Yiyang Fu
AU  - Liuyi Chen
AU  - Yuxue Ren
AU  - Shuhan Wang
AU  - Ling Wang
AU  - He Li
PY  - 2025
DA  - 2025/09/22
TI  - A Comparative Analysis of the Performance Differences Between Conventional and Annular Jet Ventilation Systems in Pollutant Removal in a Cable Maintenance Manhole
BT  - Proceedings of the 2025 International Conference on Resilient City and Safety Engineering (ICRCSE 2025)
PB  - Atlantis Press
SP  - 378
EP  - 385
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-856-1_35
DO  - 10.2991/978-94-6463-856-1_35
ID  - Lin2025
ER  -

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