Studies of some high solidity symmetrical and unsymmetrical blade H-Darrieus rotors with respect to starting characteristics, dynamic performances and flow physics in low wind streams

Sengupta, Anal Ranjan; Biswas, Agnimitra; Gupta, R.

doi:10.1016/j.renene.2016.03.029

Cited by 104 publications

(30 citation statements)

References 19 publications

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“…It was reported that the VAT has the lowest self-starting capability with NACA 0012 [8] and a highest capability with NACA 0021, among the various symmetric airfoils investigated [9]. Different blade geometries have been proposed and tested to improve the self-starting capability of the VAT [10][11][12][13][14][15][16]. The blade pitch control was also found to be an effective method for the VAT to have a better self-starting capability [17,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion

Liu

Shi

2016

Energies

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Self-starting performance is a key factor in the evaluation of a Darrieus straight-bladed vertical axis turbine. Most traditional studies have analyzed the turbine's self-starting capability using the experimental and numerical data of the forced rotation. A 2D numerical model based on the computational fluid dynamics (CFD) software ANSYS-Fluent was developed to simulate the self-starting process of the rotor at constant incident water-flow velocities. The vertical-axis turbine (VAT) rotor is driven directly by the resultant torque generated by the water flow and system loads, including the friction and reverse loads of the generator. It is found that the incident flow velocity and the moment of inertia of the rotor have little effect on the averaged values of tip-speed ratios in the equilibrium stage under no-load conditions. In the system load calculations, four modes of the self-starting were found: stable equilibrium mode, unstable equilibrium mode, switch mode and halt mode. The dimensionless power coefficient in the simulations of passive rotation conditions is found to be, on average, 38% higher than those achieved in the simulations of forced rotation conditions.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion

Liu

Shi

2016

Energies

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“…A new blade profile for Darrieus VAWT named EN0005 was created by applying the new methodology presented in this paper. The new profile offers self-start to a Darrieus VAWT and good performance at high TSR [32,[38][39][40]. The blade profile EN0005 is presented in Fig.…”

Section: Blade Development By Applying the New Methodologymentioning

confidence: 99%

“…However, this is a very time consuming task that usually requires a significant computation time to study profile variations. Some of the modifications that can be made to the blade profile to enhance the self-starting behavior of VAWT are: high turbine solidity; blades with inclined leading edge; cambered blades [32][33]; thick blades [34]. However, as the VAWT self-starting behavior is enhanced, a compromise to the wind turbine performance at high TSR should be made.…”

Section: Blade Profile Designmentioning

confidence: 99%

“…Although with inversed orientation for the remaining angles, the normal force is very similar to the other blade profiles. The self-start ability that blade profile EN0005 offers is validated in the independent work [32].  This paper focused on the study and development of new blade profiles for Darrieus type VAWT capable to self-start without the use of extra components or external energy input.…”

Section: Fig 24mentioning

confidence: 99%

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Darrieus vertical axis wind turbines: methodology to study the self-start capabilities considering symmetric and asymmetric airfoils

Batista¹,

Melício²,

Mendes³

2018

Res. Eng. Struct. Mat.

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Disclaimer All the opinions and statements expressed in the papers are on the responsibility of author(s) and are not to be regarded as those of the journal of Research on Engineering Structures and Materials (RESM) organization or related parties. The publishers make no warranty, explicit or implied, or make any representation with respect to the contents of any article will be complete or accurate or up to date. The accuracy of any instructions, equations, or other information should be independently verified. The publisher and related parties shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with use of the information given in the journal or related means.

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“…In addition, the camber slightly improved VAWT's performance. Similarly, Sengupta et al [33] also conducted a CFD investigation to evaluate the self-starting features and efficiency of a H-Darrieus turbine with unsymmetrical blades under low wind conditions. The study concluded that the unsymmetrical blades had a higher power and static and dynamic torque coefficient than the evaluated symmetrical blades.…”

Section: Micro-small Scalementioning

confidence: 99%

A Review of Numerical Modelling of Multi-Scale Wind Turbines and Their Environment

et al. 2018

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Abstract:Global demand for energy continues to increase rapidly, due to economic and population growth, especially for increasing market economies. These lead to challenges and worries about energy security that can increase as more users need more energy resources. Also, higher consumption of fossil fuels leads to more greenhouse gas emissions, which contribute to global warming. Moreover, there are still more people without access to electricity. Several studies have reported that one of the rapidly developing source of power is wind energy and with declining costs due to technology and manufacturing advancements and concerns over energy security and environmental issues, the trend is predicted to continue. As a result, tools and methods to simulate and optimize wind energy technologies must also continue to advance. This paper reviews the most recently published works in Computational Fluid Dynamic (CFD) simulations of micro to small wind turbines, building integrated with wind turbines, and wind turbines installed in wind farms. In addition, the existing limitations and complications included with the wind energy system modelling were examined and issues that needs further work are highlighted. This study investigated the current development of CFD modelling of wind energy systems. Studies on aerodynamic interaction among the atmospheric boundary layer or wind farm terrain and the turbine rotor and their wakes were investigated. Furthermore, CFD combined with other tools such as blade element momentum were examined. Keywords:Computational Fluid Dynamic (CFD); micro to small wind turbine; building integrated with wind turbine; wind farm; aerodynamic interaction; wind energy systems; atmospheric boundary layer (ABL); blade element momentum (BEM)

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Studies of some high solidity symmetrical and unsymmetrical blade H-Darrieus rotors with respect to starting characteristics, dynamic performances and flow physics in low wind streams

Cited by 104 publications

References 19 publications

Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion

Numerical Study on Self-Starting Performance of Darrieus Vertical Axis Turbine for Tidal Stream Energy Conversion

Darrieus vertical axis wind turbines: methodology to study the self-start capabilities considering symmetric and asymmetric airfoils

A Review of Numerical Modelling of Multi-Scale Wind Turbines and Their Environment

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