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Journal ArticleDOI

Hydrodynamic performance of vertical axis hydrokinetic turbine based on Taguchi method

01 Jan 2022-Renewable Energy-Vol. 186, pp 573-584
TL;DR: In this paper , the authors used the Taguchi method to optimize the typical parameters of the vertical axis turbine, i.e., airfoil (NACA), pitch angle (β), enwinding ratio (ϖ), solidity ratio (σ), and small shaft position (O).
About: This article is published in Renewable Energy.The article was published on 2022-01-01. It has received 6 citations till now. The article focuses on the topics: Taguchi methods & Vertical axis wind turbine.
Citations
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Journal ArticleDOI
02 Aug 2022-Energies
TL;DR: In this article , a drag-lift hybrid type wind turbine structure based on an NACA0018 symmetrical airfoil was proposed, which can adaptively change the blade shape under static and low speed conditions.
Abstract: In recent years, with the continuous development of new energy, how to efficiently use wind energy has received more and more market attention. Due to cost advantages, the development of small wind turbines is accelerating. Among them, the design and research of the airfoil design and research of the lift vertical axis wind turbine has matured, but because of the aerodynamic characteristics of the lift airfoil structure, it is impossible to start itself at low wind speed, resulting in the waste of low wind speed energy. Although the drag wind turbine has good self-starting performance, the wind energy utilization efficiency in the high-speed state is inefficient. Each has its own unique shortcomings, which directly affects the marketization of small wind turbines. In order to solve these problems, this paper presents a drag-lift hybrid type wind turbine structure based on an NACA0018 symmetrical airfoil, which can adaptively change the blade shape. This design can keep the blade in the drag shape under static and low speed conditions, and adaptively change the lift shape with the increase of speed. In addition, through the research method of CFD numerical simulation combined with physical experiments, the proposed wind turbine design is studied and analyzed from multiple angles. At the same time, the “6DOF + dynamic grid” setting is used to study the influence of the opening angle factor of the drag-lift hybrid blade on the self-starting performance, and the study shows that the design of the drag-lift hybrid blade proposed in this paper has a higher self-starting torque and lower starting wind speed than the traditional lifting blade, and it is observed that the drag-lift hybrid blade has the best self-starting performance when the opening angle of the blade is 80°. At the same time, the problem of switching the blade morphology of the drag-lift hybrid blade is also analyzed, along with how to use the spring to control all this adaptively. In order to better analyze the advantages of the drag-lift hybrid design proposed in this paper, a wind tunnel test was also carried out using the physical model, and the relationship between the leaf tip speed ratio and the wind energy utilization rate was obtained, which intuitively showed the improvement of the wind energy utilization rate of the drag-lift hybrid design compared with the traditional lift blade.

2 citations

Journal ArticleDOI
TL;DR: In this paper , two surrogate models, i.e., Kriging and artificial neural networks (ANN), were adopted for the performance prediction of a twin-VAWT with a close staggered arrangement.

2 citations

Journal ArticleDOI
TL;DR: In this article , the performance comparison of straight and helical-bladed lift-based VAHTs and the influence of design and operating conditional parameters was made and the potential research areas that need to be addressed in future studies were also found and presented.

2 citations

Journal ArticleDOI
TL;DR: In this article , an orthogonal array outlining these five parameters, e.g., spacing (L/D), rotation direction (RD), phase difference (ϕ), incoming flow angle (β), and blade-tip speed ratio (λ), with 4 different levels per parameter, is constructed.
TL;DR: In this article , the effects of turbulence on power generation from a current energy converter (CEC) are not fully understood and the authors investigated the correlation between a vertical axis CEC's power output and the water velocity in the frequency and time domains.
Abstract: The effects of turbulence on power generation from a Current Energy Converter (CEC) are not fully understood. This thesis investigates the correlation between a vertical axis CEC's power output and the water velocity in the frequency and time domains. Chapter 2 shows the correlation between velocity and electrical power in frequency space. This correlation gives insight into the size of eddies that influence the CEC's power output. The results of this correlation analysis show that eddies of diameter around 0.8m have a noticeable impact on the power generation. Calculating the observed average integral length scale, the range of eddy diameters around the CEC are 0.52m-5.8m. Since 0.8m is in this observed range it suggests that the turbulence may influence the CEC's power output. Chapter 3 analyzes the relationship between the turbulence velocity cubed and electrical power through the correlation of the two data sets. The correlation was carried out by first separating out the four velocity components derived from cubing the sum of the turbulence and average velocities. The commonly used ratio of the turbulence kinetic energy to total kinetic energy does not include these cross terms nor are these cross terms typically included in the calculation of power derived from the turbulence velocity. The turbulence velocity cubed has a correlation of -0.007 with the CEC power output indicating that the turbulence has a small, negative impact on the CEC power output.
References
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Journal ArticleDOI
TL;DR: In this paper, an attempt has been made to review hydrokinetic energy theory for energy conversion system from water currents analogous to wind power system, and the most widespread classes of hydro-kinetic turbines are discussed in detail with respect to their benefits, drawbacks and desirable conditions for applications.
Abstract: Energy crisis and high emission of fossil fuels are major driving forces for developing renewable energy based technologies. In order to meet growing demand for energy, hydropower can be one of the sustainable alternatives. Further, the hydrokinetic turbine is considered as one of the most emerging technologies which harness energy from flowing water. In this paper, an attempt has been made to review hydrokinetic energy theory for energy conversion system from water currents analogous to wind power system. The most widespread classes of hydrokinetic turbines are discussed in detail with respect to their benefits, drawbacks and desirable conditions for applications. It has been found that in spite of some prevailing downsides of vertical axis turbine like of self-starting and lower efficiency, vertical axis turbines are appealing for many riverine applications. One of the prominent turbines of its kind is the Savonius hydrokinetic turbine that has the capacity to self-start at a very low fluid velocity in the river, canal etc. However, Savonius type hydrokinetic turbine inherently has poor efficiency. A number of experimental and numerical studies with a large number of physical designs and parameters have been carried out in the area of Savonius rotor to enhance its efficiency. Under this study, review of different parameters affecting the performance of Savonius hydrokinetic turbine has been carried out and presented in this paper which may be useful for future studies to improve the efficiency of such turbines.

132 citations

Journal ArticleDOI
TL;DR: In this paper, three-dimensional effects in studying a vertical axis tidal current turbine are modeled using a newly developed vortex method, and the effects on predicting power output and wake trajectory are analyzed in particular.

119 citations

Journal ArticleDOI
TL;DR: In this paper, a combination of CFD and Taguchi method is applied to optimize the aerodynamic performance of a typical three-bladed VAWT at a low TSR of 2.

98 citations

Journal ArticleDOI
TL;DR: This review paper gives the useful information about the attraction and challenge of the marine current energy, and the newest development of the technologies and projects.
Abstract: Reducing greenhouse gas emissions becomes a top priority in the world with the emergence of global warming and environmental problems. Various renewable energies appear during the last decades. Ocean captures and stores huge amounts of energy, which could satisfy five times of world energy demand. Due to technology limitations and economic considerations, marine current energy appears the most attractive choice compared with the other ocean energy form. Although the existing expertise and technology in offshore wind energy conversion system can be partially transferred to marine current energy conversion system due to the similar structure, there are still many technological challenges to overcome. Meanwhile, the system operates under the water will inevitably have some negative or positive impacts on the surrounding environment. In this paper, it shows the interest and the principle of the marine current energy, and also discusses the advantages and disadvantages. The environmental impacts around the devices, the technological challenges, and the essential support structures are presented as well. The state-of-the-art horizontal axis turbines and their relative technologies and the latest projects are described finally. This review paper gives the useful information about the attraction and challenge of the marine current energy, and the newest development of the technologies and projects.

83 citations