Influence of the vortex design method in the performance characteristics of reversible axial rotors

Sarmiento, Angie Lizeth Espinosa; Oliveira, Waldir de; Camacho, Ramiro Gustavo Ramírez

doi:10.1007/s40430-016-0680-x

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…The 2nd order upwind scheme was used for the spatial discretization of all the equations including a transport term (i.e., momentum, energy, and turbulence), as well as the bounded 2nd order implicit for the time differencing, to achieve a good resolution. The turbulence model utilized was k-ω SST, in line with Espinosa Sarmiento et al, 2021;Ramirez Camacho;de Oliveira, 2020;Sarmiento;Camacho, 2017, along pressurebased solver-type, within coupled solution algorithm. It was necessary 30 iterations per time-step that in turn was equal to 2,228x10 -4 s. The convergence criteria equal to 0,1% of variation in Coefficient of Power (Cp) between two subsequent revolutions is achieved at approximately 90 revolutions, so it was necessary 28880 time-steps.…”

Section: Solver Settingsmentioning

confidence: 99%

Validation of a CFD Methodology Applied to a H-Darrieus Vertical Axis Wind Turbine

Junior,

Sarmiento,

Gamboa

2023

JER

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Studies and research in wind energy have received great attention in recent years, mainly in the decentralized generation of electric energy, through smallsize wind turbines. In this sense, the present work aims to validate a Computational Fluid Dynamics methodology for a case study of an H-Darrieus Vertical Axis Wind Turbine. The main recommendations of a robust reference methodology were replicated, which carried out a multivariate sensitivity analysis, using a transient two-dimensional simulation model and the sliding mesh technique to account for the turbine's rotational motion. Comparing the results from the simulation of the present work with the results of the reference methodology, satisfactory values were obtained, considering that the maximum difference in the final value of the Coefficient of Power was less than 9%. Furthermore, the torque profile of both studies was virtually identical. Based on these results, it was possible to conclude that the studied methodology was validated and, therefore, can be applied to other small-size H-Darrieus Wind Turbines, operating under similar operating conditions.

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Section: Solver Settingsmentioning

confidence: 99%

Validation of a CFD Methodology Applied to a H-Darrieus Vertical Axis Wind Turbine

Junior,

Sarmiento,

Gamboa

2023

JER

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“…This work will use a type of non-free vortex based on Wallis (1983) and Sarmiento et al (2017), where the circumferential component of the absolute velocity after the rotor, cu6, varies linearly along the blade. This condition is represented by Eq.…”

Section: Radial Equilibrium Conditionmentioning

confidence: 99%

Free and Non-Free Vortex Design for Axial Fans with Circumferential Sweep through CFD Techniques

2022

JAFM

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The sound generated by axial flow fans has become increasingly important in several industrial areas. These devices represent considerable noise sources that must be considered from the design stage. The scope of this research work is to present an axial fan design methodology based on the theory of the wing lift and to compare the aerodynamic and aeroacoustics behavior with the free vortex and the non-free vortex conditions. The effect of forward circumferential sweep on the rotor blades is analyzed in both conditions, which consists of a displacement in the tangential direction in the direction of rotor rotation. A cubic polynomial function is proposed for the construction of the blade geometry with circumferential sweep. It defines the center line of the blade and it is taken at 50% of the leading edge of each blade profile. The methodology for analyzing aeroacoustics behavior in fans is based on the integration of Computational Aeroacoustics and Computational Fluid Dynamics in order to analyze aerodynamic behavior, sound power level and sound pressure level at the preliminary design stage. It was verified that although both rotors present a similar aerodynamic behavior (the NFV rotor has a slightly lower performance), according to the analysis of local sound sources, the NFV rotor presents a slight decrease in the sound sources. It was also verified that the NFV rotor presents 2.2 dB less in sound pressure level than the FV rotor.

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“…One of the technologies used for power generation involves gas microturbines (GM), which produce a nominal power between 25 kWe and 300 kWe [11]. The structural configuration of turbines may vary according to the manufacturer and its application [12], but GM usually operates in a single-shaft configuration with a regeneration system, reaching efficiencies of up to 35%. In the case of GM without a regeneration mechanism, the electrical efficiency can reach values up to 17% [13].…”

Section: Introductionmentioning

confidence: 99%

Environmental and Energetic Evaluation of Refuse-Derived Fuel Gasification for Electricity Generation

et al. 2021

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In this work, an energetic and environmental evaluation of the electricity generation process through refuse-derived fuel (RDF) gasification coupled to a gas microturbine (GM) was performed. Two scenarios are considered with different gasification agents in RDF gasification modeling: air and air enriched with oxygen. A thermodynamic chemical equilibrium approach was used to analyze the gasification parameters. The results of RDF gasification indicate a maximum value of syngas low heating value (LHV) equal to 8.0 MJ/Nm3, obtained for an equivalence ratio of 0.3. The use of these syngas in the gas microturbine produces 79.6 kW of electrical power. For the environmental evaluation of gasification and electricity generation systems, the Life Cycle Assessment methodology was employed. The calculated environmental impacts indicate that the emission of contaminants from fossil fuel combustion (in the stage of transport by heavy load vehicles) and that the electricity consumption for equipment operation (in the stage of municipal solid waste pretreatment) contributes to environmental pollution. On the other hand, electricity generation through GM presented lower environmental impact for all analyzed categories, suggesting that the electricity generation from gas obtained from gasification could be a viable option for thermochemical conversion of RDF and its subsequent energetic use.

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Influence of the vortex design method in the performance characteristics of reversible axial rotors

Cited by 7 publications

References 3 publications

Validation of a CFD Methodology Applied to a H-Darrieus Vertical Axis Wind Turbine

Validation of a CFD Methodology Applied to a H-Darrieus Vertical Axis Wind Turbine

Free and Non-Free Vortex Design for Axial Fans with Circumferential Sweep through CFD Techniques

Environmental and Energetic Evaluation of Refuse-Derived Fuel Gasification for Electricity Generation

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