Numerical analysis of the mirco-particles distribution inside an underground subway system due to train piston effect

Izadi, Tahereh; Mehrabian, M. A.; Ahmadi, Goodarz; Abouali, Omid

doi:10.1016/j.jweia.2021.104533

Cited by 22 publications

(4 citation statements)

References 64 publications

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“…The ICEM CFD mesh generation software was used to mesh the established physical model (An et al, 2013;Izadi et al, 2021;Liu et al, 2021;Martins and Carrilho., 2017). In this paper, the tetrahedral mesh was used to divide the constructed model, and the physical model after the mesh generation and its mesh quality distribution chart…”

Section: Establishment Of Physical Modelmentioning

confidence: 99%

Study on PM diffusion and distribution of trackless rubber-tyred vehicle under different driving conditions in underground coal mining environment

Nie

Liu

Hua

et al. 2023

Preprint

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Particulate matter (PM) is one of the most harmful exhaust pollutants to human health. In this study, the PM diffusion and distribution emitted by trackless rubber-tyred vehicle under different driving conditions in coal mine was analyzed with numerical simulations and field measurements. The results show that when the vehicle velocity was constant, the proportion of PM with a concentration below 6 mg/m3 was the highest owing to the influences of diffusion and airflow dilution. However, when the diffusion distance is less than 3 m, the PM concentration far exceeds the occupational exposure limit (C = 10 mg/m3) specified in the coal mine safety regulations.With increasing vehicle velocity, the PM concentration gradient at a diffusion distance of 0–6 m showed the most significant slope. Besides, the concentration fluctuation of PM was the largest and relatively high when the diffusion distance was 5–15m. Therefore, the area 15 m from the exhaust gas pipe opening of the trackless rubber-tyred vehicle should be controlled.

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Section: Establishment Of Physical Modelmentioning

confidence: 99%

Study on PM diffusion and distribution of trackless rubber-tyred vehicle under different driving conditions in underground coal mining environment

Nie

Liu

Hua

et al. 2023

Preprint

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“…Subway is an important mode of transport is many countries. Since the official construction of the world's first subway in London, the British capital, in 1863, nearly 300 subway lines have been constructed in more than 80 cities around the world, with a total length of more than 5100 km [10] . The research on lighting design abroad is more in-depth, and various countries have formulated corresponding lighting design standards of underground railways.…”

Section: Literature Review 21 Foreign Research Statusmentioning

confidence: 99%

Comparison of Illuminance in Different Environments: A Case Study on Subway Stations

Wang

Shi

2022

JARD

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With urbanization and the rapid development of social economy, China’s rail transit industry has developed rapidly in recent years. In order to alleviate the pressure of road network, subways provide convenience as they are fast and space-saving. Subway stations are major energy consumers of urban power grid due to their large traffic volume and long operation time. On the premise of ensuring operation safety, reducing the energy consumption of subway helps in energy conservation and emission reduction as proposed in the 13th Five-Year Plan. According to the statistics of the energy-saving evaluation report of rail transit engineering, the lighting system accounts for 20%–30% of the total power consumption of the subway station. Due to the single lighting control mode of the lighting system in the subway station, the actual station illumination cannot be reported and adjusted in time, resulting in the waste of lighting energy and high power consumption of the system. Through in-depth research on the intelligent lighting system of subway station, this paper improves the system control, and finally summarizes the optimization scheme of subway station lighting design which can effectively save the power consumption of lighting system. The main contents of this paper are as follows: The research results of this paper can provide effective measures for energy saving of electric lighting in subway stations and reduce electric energy consumption; on the other hand, as an integral part of building lighting energy-saving system, it also has certain guiding significance for the research of building lighting energy-saving.

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“…Due to the interaction between the train and the tunnel, the pressure and drag coefficients increase with the increase in train speed and blockage ratio. Izadi et al [8] simulated the movement of trains in subway tunnels and stations on a side subway platform based on a 3D computational model. The results show that when the train just enters the station and brakes, some particles are transported and spread to different platform areas.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of the Cage Lifting Piston Effect in Main Intake Shafts on Air Flow in Transportation Lanes

Wang

Guo

et al. 2023

Applied Sciences

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The main intake shaft in the mine serves as the main intake and return air shaft and also serves as a lifting shaft. The piston wind effect caused by the frequent operation of large and efficient hoisting cages in the shaft will disturb the normal flow of airflow in the transport lane connected to the shaft and affect the underground ventilation effect. Therefore, based on the SST k-ω turbulence model, this paper uses the dynamic mesh to simulate the air-fluid in the cage running in the shaft and verifies the simulation data through field measurement to study the influence of piston effect on the airflow field in the transport lane. The results show that the piston effect caused by cage operation in the shaft will disturb the flow of normal airflow in the transportation lane and affect the ventilation effect in the mine. The 1765.0 m transport lane is closest to the position of the shaft inlet, which is most significantly affected by the piston wind effect. The low-speed eddy current zone generated at the tail of the cage in the upwind operation has a large area and strong adsorption force, which causes the gas at the local position in the transportation lane to generate eddy current and reverse flow, hindering the flow of fresh air in the lane. The influence distance and strength of the piston effect on each measuring point in the transportation lane are limited. When the measuring point distance increases from 21.7 m to 71.7 m, the differential pressure of measuring points in 1414.0 m, 1584.0 m and 1765.0 m transport lanes decreases by 11.08 Pa, 9.62 Pa and 8.58 Pa, respectively.

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Numerical analysis of the mirco-particles distribution inside an underground subway system due to train piston effect

Cited by 22 publications

References 64 publications

Study on PM diffusion and distribution of trackless rubber-tyred vehicle under different driving conditions in underground coal mining environment

Study on PM diffusion and distribution of trackless rubber-tyred vehicle under different driving conditions in underground coal mining environment

Comparison of Illuminance in Different Environments: A Case Study on Subway Stations

Study on the Influence of the Cage Lifting Piston Effect in Main Intake Shafts on Air Flow in Transportation Lanes

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