Numerical study of two-bucket Savonius wind turbine cluster
TL;DR: In this article, the authors developed a multi-turbine cluster for construction of efficient patterned vertical axis wind turbine farms, where numerical solutions were performed for a single Savonius turbine, clusters of two turbines in parallel and oblique positions and triangular clusters of three turbines facing the wind forward and backward.
About: This article is published in Journal of Wind Engineering and Industrial Aerodynamics.The article was published on 2015-02-01. It has received 98 citations till now. The article focuses on the topics: Savonius wind turbine & Turbine.
Citations
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TL;DR: In this article, the power output of two straight-bladed vertical-axis wind turbines is simulated using computational fluid dynamics (CFD) as well as analyzed and optimized using the Taguchi method.
108 citations
TL;DR: This paper shows how to improve the performance of a conventional Savonius blade by introducing a novel configuration without expensive and complex modifications on the geometry, with 17.81% improvement over the conventional configuration.
62 citations
TL;DR: In this paper, a Savonius-style vertical axis wind turbine with direct discharge flow capability in order to ventilate buildings was designed and validated using available experimental results in literature, and two design modifications, variations in cross-section with respect to the height of rotor and conical shaft in the middle of wind rotor are proposed.
62 citations
TL;DR: In this paper, the effects of the attachment angle and radius ratio on the efficiency and starting performance of a Darrieus-Savonius combined rotor were investigated by a computational fluid dynamics approach.
58 citations
TL;DR: In this article, the authors used a simple barrier to deviate the fluid flow from the reversing bucket of the Savonius turbine to enhance its generated power, and numerical modeling has been performed by applying computational fluid dynamics (CFD).
57 citations
References
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TL;DR: In this paper, two new two-equation eddy-viscosity turbulence models are presented, which combine different elements of existing models that are considered superior to their alternatives.
Abstract: Two new two-equation eddy-viscosity turbulence models will be presented. They combine different elements of existing models that are considered superior to their alternatives. The first model, referred to as the baseline (BSL) model, utilizes the original k-ω model of Wilcox in the inner region of the boundary layer and switches to the standard k-e model in the outer region and in free shear flows. It has a performance similar to the Wilcox model, but avoids that model's strong freestream sensitivity
15,459 citations
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01 Jan 1993
TL;DR: In this paper, the authors proposed a compressible ecoulement for compressible ECCs, based on the disquette reference record created on 2005-11-18, modified on 2016-08-08.
Abstract: Keywords: ecoulement : compressible Note: + disquette Reference Record created on 2005-11-18, modified on 2016-08-08
7,023 citations
TL;DR: In this article, the local turbulent viscosity is determined from the solution of transport equations for the turbulence kinetic energy and the energy dissipation rate, and the predicted hydrodynamic and heat-transfer development of the boundary layers is in close agreement with the measured behaviour.
3,999 citations
TL;DR: Langtry et al. as discussed by the authors developed a new correlation-based transition model based strictly on local variables, which is compatible with modern computational fluid dynamics (CFD) approaches, such as unstructured grids and massive parallel execution.
Abstract: A new correlation-based transition model has been developed, which is based strictly on local variables. As a result, the transition model is compatible with modern computational fluid dynamics (CFD) approaches, such as unstructured grids and massive parallel execution. The model is based on two transport equations, one for intermittency and one for the transition onset criteria in terms of momentum thickness Reynolds number. The proposed transport equations do not attempt to model the physics of the transition process (unlike, e.g., turbulence models) but form a framework for the implementation of correlation-based models into general-purpose CFD methods. Part I (this part) of this paper gives a detailed description of the mathematical formulation of the model and some of the basic test cases used for model validation, including a two-dimensional turbine blade. Part II (Langtry, R. B., Menter, F. R., Likki, S. R., Suzen, Y. B., Huang, P. G., and Volker, S., 2006, ASME J. Turbomach., 128(3), pp. 423–434) of the paper details a significant number of test cases that have been used to validate the transition model for turbomachinery and aerodynamic applications. The authors believe that the current formulation is a significant step forward in engineering transition modeling, as it allows the combination of correlation-based transition models with general purpose CFD codes.
1,131 citations
TL;DR: In this article, the authors investigated the use of counter-rotating vertical-axis wind turbines (VAWTs) in order to achieve higher power output per unit land area than existing wind farms consisting of HAWTs.
Abstract: Modern wind farms comprised of horizontal-axis wind turbines (HAWTs) require significant land resources to separate each wind turbine from the adjacent turbine wakes. This aerodynamic constraint limits the amount of power that can be extracted from a given wind farm footprint. The resulting inefficiency of HAWT farms is currently compensated by using taller wind turbines to access greater wind resources at high altitudes, but this solution comes at the expense of higher engineering costs and greater visual, acoustic, radar, and environmental impacts. We investigated the use of counter-rotating vertical-axis wind turbines (VAWTs) in order to achieve higher power output per unit land area than existing wind farms consisting of HAWTs. Full-scale field tests of 10-m tall VAWTs in various counter-rotating configurations were conducted under natural wind conditions during summer 2010. Whereas modern wind farms consisting of HAWTs produce 2–3 W of power per square meter of land area, these field tests indicate that power densities an order of magnitude greater can potentially be achieved by arranging VAWTs in layouts that enable them to extract energy from adjacent wakes and from above the wind farm. Moreover, this improved performance does not require higher individual wind turbine efficiency, only closer wind turbine spacing and a sufficient vertical flux of turbulence kinetic energy from the atmospheric surface layer. The results suggest an alternative approach to wind farming that has the potential to concurrently reduce the cost, size, and environmental impacts of wind farms.
435 citations