Numerical simulation and experimental study on ventilation system for powerhouses of deep underground hydropower stations

Liu, Yicai; Shouchuan, Wang; Deng, Yangbing; Ma, Wei; Ma, Ying

doi:10.1016/j.applthermaleng.2016.05.101

Cited by 26 publications

(11 citation statements)

References 10 publications

(9 reference statements)

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“…(3), (4), (5) (Brum et al 2019). As for the turbulence model of airflow, the RNG k−E model was employed in this study for its clear advantage in predicting near-wall flow and low Reynolds number flows and excellent performance in both accuracy and efficiency (Liu et al 2016).…”

Section: Model Of Heat Transfer Between Airflow and Rock In Minementioning

confidence: 99%

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

Guo

Pang

et al. 2020

Arab J Geosci

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Not only is the thermal environment of the coal mining face related to the temperature of the surrounding rock, it is also closely associated with the ventilation model of the working face. In this study, the numerical methods were applied to study the impact of two major ventilation systems on the airflow temperature of working face in coalmine. Firstly, a heat transfer model of the surrounding rock and airflow was established to reveal that the wall roughness of the surrounding rock could enhance heat transfer between the surrounding rock and the airflow. Moreover, an analysis was conducted of the heat transfer between the airflow and the surrounding rock under different modes of ventilation in the first mining face. According to the analytical results, the temperature of airflow in the U-type ventilation system is lower than in the Y-type ventilation system. For the next adjacent coal mining face, however, the Y-type ventilation system is more conducive in reducing the temperature of the airflow. Therefore, with regard to the mine as a whole, the Y-type ventilation system is more effective than a U-type system in reducing heat and humidity in the ambient environment.

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Section: Model Of Heat Transfer Between Airflow and Rock In Minementioning

confidence: 99%

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

Guo

Pang

et al. 2020

Arab J Geosci

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“…(1) A non-slip stationary wall boundary is applied to the cavern surface, heading face and air duct surface, and the standard wall function method is used. The roughness constant (Cs) is set as 0.57 and the equivalent sand-grain roughness height (Ks) is used for roughness height, Ks = 0.07 m [29]. The distance from point P in the first near-wall cell to the wall (yp) is 0.52 m. (2) The outlet of the air duct is considered to be a velocity-inlet with an airflow velocity of 15 m/s in Figure 5a.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…According to the actual project situation, there are three types of boundary conditions in the simulations: wall, inlet and outlet [27][28][29]. (1) A non-slip stationary wall boundary is applied to the cavern surface, heading face and air duct surface, and the standard wall function method is used.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Optimization Scheme for Construction Ventilation in Large-Scale Underground Oil Storage Caverns

et al. 2018

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The ventilation effect has a direct influence on the efficiency and security of the construction of an underground cavern group. Traditional forced ventilation schemes may be ineffective and result in resource wastage. Based on the construction ventilation of the Jinzhou underground oil storage project, an axial flow gallery ventilation mode using shafts as the fresh air inlet was proposed. A 3D steady RANS (Reynolds Averaged Navier-Stokes) approach with the RNG (Renormalization-group) k-ε turbulence model was used to study airflow behavior and hazardous gas dispersion when different ventilation schemes were employed. Field test values of the air velocity and CO concentration in the main cavern and construction roadway were also adopted to validate the RNG k-ε turbulence model. The results showed that the axial flow gallery ventilation mode can ensure that the direction of air flow is the same as that of heavy trucks, fresh air is always near the excavation face, and the disturbance of the construction process is greatly reduced. The scheme is suitable for large-scale caverns with a ventilation distance less than 2 km, and an intermediate construction shaft is not needed. When the ventilation distance exceeds 2 km, it is possible to use jet fans to assist the axial flow gallery ventilation mode or to completely adopt jet-flow gallery ventilation.

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“…By considering the daily measured parameters of the thermal comfort of the uphole environment, the value of the thermal comfort of the downhole environment is simulated during the day and in each optimization cycle [20]. Numerical simulations are conducted in Fluent to investigate the temperature field and wind speed field at different heights of the underground roadway and to implement the dynamic regulation of the dynamic control of the underground roadway [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on the Dynamic Ventilation Control of Single Head Roadway in High‐Altitude Mine Based on Thermal Comfort

Nie

Feng

Shudu

et al. 2019

Advances in Civil Engineering

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Dynamic ventilation control based on the concept of thermal comfort is proposed and applied to single head roadway in high-altitude gold mine in Qinghai. Hourly thermal comfort values are determined for typical working conditions, and a thermal comfort curve is generated. The values are adjusted based on the external environment and the changes in the miners’ thermal comfort. The Fluent software is used to simulate the temperature field and wind speed field of the tunnel roadway at three heights, and the results are used to fit the thermal comfort curve in the roadway. The results show that the thermal comfort is lowest at a roadway height of 1 m and a longitudinal length of 16 m because the wind speed is the highest and the temperature is lowest at these locations. When the dynamic ventilation control is used, the optimal thermal comfort levels can be determined for the locations in the single head roadway.

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Numerical simulation and experimental study on ventilation system for powerhouses of deep underground hydropower stations

Cited by 26 publications

References 10 publications

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

Numerical study on heat transfer between airflow and surrounding rock with two major ventilation models in deep coal mine

Optimization Scheme for Construction Ventilation in Large-Scale Underground Oil Storage Caverns

Simulation Study on the Dynamic Ventilation Control of Single Head Roadway in High‐Altitude Mine Based on Thermal Comfort

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