CFD Simulations for the Selection of an Appropriate Blade Profile for Improving Energy Efficiency in Axial Flow Mine Ventilation Fans

Panigrahi, Durga Charan; Mishra, Devi Prasad

doi:10.7424/jsm140104

Cited by 30 publications

(13 citation statements)

References 6 publications

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“…However, CFD simulations accuracy depends on the quality of the grid system used for resolving the computational domain, as well as the appropriateness of the turbulence model in capturing the relevant physics [25]. Simulation of air flow around aerofoils using CFD has been studied by several researchers [26][27][28][29]. It is a challenge for the CFD-RANS model to simulate flow over thick aerofoils.…”

Section: Aerodynamic Characterization Of Iced Aerofoilsmentioning

confidence: 99%

Numerical Investigation of the Aeroelastic Behavior of a Wind Turbine with Iced Blades

et al. 2019

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Wind turbines installed in cold-climate regions are prone to the risks of ice accumulation which affects their aeroelastic behavior. The studies carried out on this topic so far considered icing in a few sections of the blade, mostly located in the outer part of the blade, and their influence on the loads and power production of the turbine are only analyzed. The knowledge about the influence of icing in different locations of the blade and asymmetrical icing of the blades on loads, power, and vibration behavior of the turbine is still not matured. To improve this knowledge, multiple simulation cases are needed to run with different ice accumulations on the blade considering structural and aerodynamic property changes due to ice. Such simulations can be easily run by automating the ice shape creation on aerofoil sections and two-dimensional (2-D) Computational Fluid Dynamics (CFD) analysis of those sections. The current work proposes such methodology and it is illustrated on the National Renewable Energy Laboratory (NREL) 5 MW baseline wind turbine model. The influence of symmetrical icing in different locations of the blade and asymmetrical icing of the blade assembly is analyzed on the turbine’s dynamic behavior using the aeroelastic computer-aided engineering tool FAST. The outer third of the blade produces about 50% of the turbine’s total power and severe icing in this part of the blade reduces power output and aeroelastic damping of the blade’s flapwise vibration modes. The increase in blade mass due to ice reduces its natural frequencies which can be extracted from the vibration responses of the turbine operating under turbulent wind conditions. Symmetrical icing of the blades reduces loads acting on the turbine components, whereas asymmetrical icing of the blades induces loads and vibrations in the tower, hub, and nacelle assembly at a frequency synchronous to rotational speed of the turbine.

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Section: Aerodynamic Characterization Of Iced Aerofoilsmentioning

confidence: 99%

Numerical Investigation of the Aeroelastic Behavior of a Wind Turbine with Iced Blades

et al. 2019

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“…The system also includes components that have varying degrees of power demand. Compressors and refrigeration systems are good examples of these, as they are dependent on the mining operation that is currently being executed [27,37]. The energy consumption of compressor and refrigeration systems has a distinguishable consistency for time of day and weekdays or weekends.…”

Section: Dependency Analysismentioning

confidence: 99%

Holistic analysis of the effect on electricity cost in South Africa’s platinum mines when varying shift schedules according to time-of-use tariffs

Shaw¹,

Mathews

Marais

2019

J. energy South. Afr.

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In the past the cost of electricity was not a significant concern and was not common practice for mining companies to consider peak time-of-use (TOU) tariffs for their shift schedules. It has become more prevalent, as TOU tariffs continue increasing, to consider energy saving important. A study was carried out to analyse the mining operation of a South African deep-level platinum mine in respect of integrated load management, shift changes and TOU schedules. This was achieved by thoroughly analysing energy consumers, mine operational schedules and their interconnectedness. A specific mining system was analysed as a case study and a maximum savings scenario was determined, using the methodology formulated. The maximum savings scenario schedule change resulted in a 1.3% cost reduction. System improvements had an additional potential reduction effect of 8.4%, which was primarily the result of a reduction in compressors’ power consumption. The implications of the proposed schedule adjustments necessitated a realistic scenario. The realistic scenario had an effective financial reduction of 0.7%. The realistic schedule change, however, opened the door for large system operational improvements, which could increase the reduction potential by 7.6%. The study methods described illustrate the potential implications of integrated load management and operational schedule optimisation on the power demand and cost savings in the mining industry, specifically focusing on deep-level platinum mines.

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“…Computational fluid dynamics simulation was used to optimise axial flow ventilation fan blade profiles [18]. This method holds promise for further research on airfoil and centrifugal ventilation fans in particular, but it is limited to component design and cannot be applied to optimise the branches of complex ventilation networks.…”

Section: Modelling and Simulation Of Mine Ventilation Networkmentioning

confidence: 99%

Evaluating complex mine ventilation operational changes through simulations

Nel¹,

Vosloo²,

Mathews³

2018

J. energy South. Afr.

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Increasing the profitability of the mining industry is contingent on its ability to improve operational efficiency. Mine ventilation networks typically represent 25-50% of a mine's energy consumption and, therefore, exhibits scope for optimisation. Ventilation networks comprise numerous complex integrated airways, branches and ventilation fans. The most effective way to optimise and evaluate them is computer-aided simulations. However, no framework exists to clarify exactly how operational changes in ventilation networks should be evaluated. In this study, a scalable method was developed, implemented and analysed. The case study validation resulted in satisfying key performance indicators of both service delivery and operational energy costs, thereby increasing operational efficiency. The significance of the novel method is that it allows for improved operational decisions on mine ventilation networks. The value of the method was illustrated by the adoption of the method by the case study mining personnel to form the new norm of their procedures and standards.

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CFD Simulations for the Selection of an Appropriate Blade Profile for Improving Energy Efficiency in Axial Flow Mine Ventilation Fans

Cited by 30 publications

References 6 publications

Numerical Investigation of the Aeroelastic Behavior of a Wind Turbine with Iced Blades

Numerical Investigation of the Aeroelastic Behavior of a Wind Turbine with Iced Blades

Holistic analysis of the effect on electricity cost in South Africa’s platinum mines when varying shift schedules according to time-of-use tariffs

Evaluating complex mine ventilation operational changes through simulations

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