Experimental and numerical simulation investigations of an axial flow fan performance in high-altitude environments

Liu, Xue; Liu, Jian; Wang, Dong; Zhao, Long

doi:10.1016/j.energy.2021.121281

Cited by 16 publications

(13 citation statements)

References 28 publications

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“…It can verify that the simulation is close to reality. This study will utilize the wall function to calculate y + , as shown in Equation (7).…”

Section: Meshing Independence Verificationmentioning

confidence: 99%

“…Under the premise of the national policy of western development and the further development of mining technology and equipment [2][3][4][5], the mining of mineral resources is gradually developing towards the high-altitude areas in western China. Many of the mines, such as Reshit Mine [6], Huatailong Mine [7], and Pulang Copper Mine [8] are located at altitudes in excess of 3000 m. However, high altitude areas have unique climatic conditions of low pressure and lack of oxygen [9,10]. When the altitude rises, people who are not quickly adapted to the high-altitude environment will suffer from altitude sickness [11], which can even increase from mild acute altitude sickness to the more devastating high altitude cerebral oedema [12].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of controlled circulating ventilation and oxygen supply scheme for high-altitude mine heading face based on CFD

Zhang¹,

Wang²,

Zhang³

et al. 2023

3rd International Conference on Applied Mathematics, Modelling, and Intelligent Computing (CAMMIC 2023)

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With the depletion of mineral resources in the plains, Chinese mining industry has shifted to higher altitudes where low pressure and low oxygen has become a bottleneck limiting further development of mining technology. The traditional diffusion type of oxygen supply has low oxygen utilization. Controlled circulation ventilation offers a good alternative for oxygen supply to workers in high altitude mines. In this study, a CFD approach was used to conduct a single factor analysis of circulating duct height, distance between circulating duct outlet and heading face, oxygen supply duct height, forcing duct air velocity and circulating duct air velocity to investigate their effects on the oxygen mass fraction located at the heading face. In addition, an orthogonal experiment was designed to analyze the effect of the above five factors on the distribution of oxygen mass fraction in the heading face. The results showed that the effect of forcing duct air velocity on the oxygen mass fraction in the heading face was the greatest. The average oxygen mass fraction in the heading face is highest when the height of circulating duct was 0.9 m, the distance between circulating duct outlet and heading face was 2 m, the height of oxygen supply duct was 1.0 m, the air velocity of forcing duct was 3 m/s and the air velocity of circulating duct was 2.5 m/s.

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“…It can verify that the simulation is close to reality. This study will utilize the wall function to calculate y + , as shown in Equation (7).…”

Section: Meshing Independence Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of controlled circulating ventilation and oxygen supply scheme for high-altitude mine heading face based on CFD

Zhang¹,

Wang²,

Zhang³

et al. 2023

3rd International Conference on Applied Mathematics, Modelling, and Intelligent Computing (CAMMIC 2023)

View full text Add to dashboard Cite

show abstract

“…Based on the complex geometric structure, the calculation mesh is generated by using a polyhedral type element and the methods of local encryption are used to improve the mesh quality [13]. The numerical model can be divided into non-rotating and rotating regions according to different motion characteristics.…”

Section: Fig 2 Grid Independence Verificationmentioning

confidence: 99%

Numerical study on airflow performance and mechanical characteristics of centrifugal fan

Bai

Tan

2022

E3S Web Conf.

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As small fans are widely used to dissipate the heat of the electronic components, a series of special requirements are put forward on the airflow performance and stress characteristics. In the present study, the computational fluid dynamics (CFD) method is adopted to study the airflow characteristics of a specific type of fan, including the fluid pressure distribution, flow velocity field and fluid streamline distribution. The stress characteristics of the fan blades are systematically analyzed based on the fluid-solid coupling and thermal-solid coupling methods. The results show that with the rotation speed of 1400 rpm, the airflow velocity in the air duct is unevenly distributed, and some eddy disturbances form and occur in the flow field. To improve the operating efficiency of the fan, appropriate optimization schemes should be adopted to reduce the intensity and range of the eddy influence. When the inlet temperature is 20 °C, the stress on the impeller is mainly caused by centrifugal force and thermal load. As the inlet temperature increases, the effect of the thermal load becomes increasing. While for the centrifugal force, its influence on the impeller gradually disappears and completely disappears when the temperature reaches 50 °C.

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“…The well-known Coburn–Forster–Kane (CFK) equation describes a functional relationship between CO concentration in the environment and carboxyhemoglobin (COHb) concentration in the human body, laying the theoretical solid foundations for the study of the CO concentration limit 25 . Furthermore, a drop in air density will have an effect on the normal operation of the fan in the plateau area 26 . As a consequence, the fan must be changed to satisfy the ventilation needs of the high-altitude environment.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on CO migration after blasting in high-altitude tunnel by inclined shaft

Zhao

Meng

et al. 2022

Sci Rep

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On the western plateau of China, ventilation problems brought on by low atmospheric pressure must be overcome. And CO migration after blasting in high-altitude tunnel by inclined shaft has become a significant scientific issue. In this study, the Computational Fluid Dynamics (CFD) method was used to analyze the flow field characteristics at the junction of the inclined shaft and tunnel. In addition, the effects of different fan opening modes and different initial CO concentration distributions on the ventilation were discussed. The simulation results showed that the main difference in the ventilation wind field was reflected in the position of the vortex region due to the different fan opening modes. Meanwhile, various initial CO concentration distributions showed different migration when there was no air volume difference between the left and right tunnels. Eliminating vortex zones and fully using high velocity airflow could improve relative ventilation efficiency by at least 18%. CO would accumulate in the opposite direction of the tunnel if only one of the fans was turned on. Therefore, a two-stage ventilation scheme was proposed, and the energy consumption was reduced by at least 33%. This research can provide guidance on high-altitude tunnel construction with multiple working faces to improve ventilation efficiency and reduce energy consumption.

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Experimental and numerical simulation investigations of an axial flow fan performance in high-altitude environments

Cited by 16 publications

References 28 publications

Optimization of controlled circulating ventilation and oxygen supply scheme for high-altitude mine heading face based on CFD

Optimization of controlled circulating ventilation and oxygen supply scheme for high-altitude mine heading face based on CFD

Numerical study on airflow performance and mechanical characteristics of centrifugal fan

A numerical study on CO migration after blasting in high-altitude tunnel by inclined shaft

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