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Author

Yang Zhou

Bio: Yang Zhou is an academic researcher from Central South University. The author has contributed to research in topics: Smoke & Heat flux. The author has an hindex of 12, co-authored 33 publications receiving 343 citations.

Papers
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Journal ArticleDOI
Lu He1, Zhisheng Xu1, Hongguang Chen1, Qiulin Liu1, Yixiao Wang1, Yang Zhou1 
TL;DR: In this paper, the authors investigate the entrainment phenomenon near a mechanical exhaust vent in the tunnel fire, the computational fluid dynamics method employing the software Fire Dynamics Simulator (FDS) is utilized to analyse the effects of heat release rate (HRR) and exhaust velocity on the entrainedment near the vent.

69 citations

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the influence of cross-sectional area and aspect ratio on natural smoke exhaust in a tunnel fire, and 33 cases were simulated using the Fire Dynamics Simulator software.

42 citations

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TL;DR: In this article, a method of adding solid screens below shafts, to improve natural ventilation performance in urban tunnels, was proposed to accumulate fire-induced smoke and weaken negative influence of plug-holing.

38 citations

Journal ArticleDOI
TL;DR: In this article, 20 sets of full-scale water mist fire suppression experiments were conducted to examine the impacts of water mist system on smoke temperature characteristics, including water mist activation time (denoted by t), working pressure (P), k-factor (K) and longitudinal wind speed.

38 citations

Journal ArticleDOI
TL;DR: In this paper, a set of simplified analytical models was proposed based on the equations of continuity, energy, and pressure, and the theoretical values of airflow temperature and velocity were obtained by iterative calculations.

30 citations


Cited by
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01 Nov 1999
TL;DR: In this paper, two forms of ventilation are discussed: mixing ventilation and displacement ventilation, where the interior is at an approximately uniform temperature and there is strong internal stratification, respectively, and the effects of wind on them are examined.
Abstract: Natural ventilation of buildings is the flow generated by temperature differences and by the wind. The governing feature of this flow is the exchange between an interior space and the external ambient. Although the wind may often appear to be the dominant driving mechanism, in many circumstances temperature variations play a controlling feature on the ventilation since the directional buoyancy force has a large influence on the flow patterns within the space and on the nature of the exchange with the outside. Two forms of ventilation are discussed: mixing ventilation, in which the interior is at an approximately uniform temperature, and displacement ventilation, where there is strong internal stratification. The dynamics of these buoyancy-driven flows are considered, and the effects of wind on them are examined. The aim behind this work is to give designers rules and intuition on how air moves within a building; the research reveals a fascinating branch of fluid mechanics.

559 citations

Journal ArticleDOI
TL;DR: In this article, the effect of strong environmental wind on a tunnel fire under natural ventilation was investigated using large eddy simulation method in order to investigate the smoke movement under the stack effect induced inside a shaft.

116 citations

Journal ArticleDOI
Yueming Wen1, Jiawei Leng1, Xiaobing Shen1, Gang Han1, Lijun Sun1, Fei Yu1 
TL;DR: This paper narratively reviews the environmental and health effects of subway ventilation and discusses the relevant engineering, environmental, and medical aspects in combination.
Abstract: Environmental health in subway stations, a typical type of urban underground space, is becoming increasingly important. Ventilation is the principal measure for optimizing the complex physical environment in a subway station. This paper narratively reviews the environmental and health effects of subway ventilation and discusses the relevant engineering, environmental, and medical aspects in combination. Ventilation exerts a notable dual effect on environmental health in a subway station. On the one hand, ventilation controls temperature, humidity, and indoor air quality to ensure human comfort and health. On the other hand, ventilation also carries the potential risks of spreading air pollutants or fire smoke through the complex wind environment as well as produces continuous noise. Assessment and management of health risks associated with subway ventilation is essential to attain a healthy subway environment. This, however, requires exposure, threshold data, and thereby necessitates more research into long-term effects, and toxicity as well as epidemiological studies. Additionally, more research is needed to further examine the design and maintenance of ventilation systems. An understanding of the pathogenic mechanisms and aerodynamic characteristics of various pollutants can help formulate ventilation strategies to reduce pollutant concentrations. Moreover, current comprehensive underground space development affords a possibility for creating flexible spaces that optimize ventilation efficiency, acoustic comfort, and space perception.

54 citations

Journal ArticleDOI
TL;DR: In this paper, the authors discuss the influence of internal and external factors on the fire suppression effectiveness of water mist, such as water mist characteristics, additives, obstacles, ventilation conditions, fuel types and flame scales.

51 citations

Journal ArticleDOI
15 Jan 2022-Energy
TL;DR: In this paper, the effect of ultrafine water mist with phosphorus-containing compounds (PCCs) on the flame in CH4/coal dust explosion is experimentally and numerically investigated.

50 citations