On the improvement of starting torque of darrieus wind turbine with trapped vortex airfoil

Kumar, Palanisamy Mohan; Surya, M. Mohan Ram; Srikanth, Narasimalu

doi:10.1109/icsgsc.2017.8038561

Cited by 14 publications

(10 citation statements)

References 4 publications

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“…Solutions such as the design of new airfoils to extend the fatigue life of blades and to reduce the manufacturing cost of the blades [2] especially for urban turbines, where the flow is characterized by highly turbulent and multidirectional. Conventional airfoils are modified by incorporating a cavity to enhance the lift at low Reynolds number (Re) [3]. The computational study on the trapped vortex airfoil shows significant improvements in starting torque, yet the performance deteriorates at higher TSR [4].…”

Section: Introductionmentioning

confidence: 99%

Wind Tunnel Validation of Double Multiple Streamtube Model for Vertical Axis Wind Turbine

Kumar¹,

Rashmitha²,

Srikanth³

et al. 2017

SGRE

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The performance and annual energy output have to be predicted to maximize the economic benefits from a wind turbine. Mathematically predicting the performance of Darrieus type lift based turbines are challenging due to the inconsistent angle of attack, blade wake interaction and local induced velocities giving rise to complex flow physics. A reliable and validated mathematical model is therefore essential to optimize the various design parameters prior to manufacture. The objective of the current study is to evaluate widely employed aerodynamic models based on their prediction accuracy, limitations, and computational requirements. Double multiple stream tube models have been discussed in detail and the predictions are experimentally validated through the wind tunnel test of three-bladed H-Darrieus rotor in terms of torque and power coefficient. The possible sources for the deviation between the predicted and measured values have been discussed and concluded with potential solutions.

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Section: Introductionmentioning

confidence: 99%

Wind Tunnel Validation of Double Multiple Streamtube Model for Vertical Axis Wind Turbine

Kumar¹,

Rashmitha²,

Srikanth³

et al. 2017

SGRE

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“…Innovative turbines are continuing to emerge to address the shortcomings of the original Darrieus design [3,4]. Tailored airfoils are developed for the Darrieus rotor to enhance self-starting capability [5][6][7][8]. Various mathematical models [3,7] are developed to assess the rotor performance.…”

mentioning

confidence: 99%

Review on the Evolution of Darrieus Vertical Axis Wind Turbine: Large Wind Turbines

et al. 2019

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The objective of the current review is to present the development of a large vertical axis wind turbine (VAWT) since its naissance to its current applications. The turbines are critically reviewed in terms of performance, blade configuration, tower design, and mode of failure. The early VAWTs mostly failed due to metal fatigue since the composites were not developed. Revisiting those configurations could yield insight into the future development of VAWT. The challenges faced by horizontal axis wind turbine (HAWT), especially in the megawatt capacity, renewed interest in large scale VAWT. VAWT provides a solution for some of the immediate challenges faced by HAWT in the offshore environment in terms of reliability, maintenance, and cost. The current rate of research and development on VAWT could lead to potential and economical alternatives for HAWT. The current summary on VAWT is envisioned to be an information hub about the growth of the Darrieus turbine from the kW capacity to megawatt scale. turbine to avert the wind load [2] has opened up new areas of application. Innovative turbines are continuing to emerge to address the shortcomings of the original Darrieus design [3,4]. Tailored airfoils are developed for the Darrieus rotor to enhance self-starting capability [5][6][7][8]. Various mathematical models [3,7] are developed to assess the rotor performance. Computational simulation is extensively used to optimise the Darrieus turbine and serves as an alternative for costly prototyping [9]. The evolution of small VAWTs with the capacity of less than 50 kW are reviewed by the author in previous work [10]. This review has been categorised based on the timeline of development. The turbines are examined on their configuration, type of support, specifications, the reason for failure, and current status. The current study is a knowledge hub on past projects that yields valuable information on the failure to develop efficient and cost-effective VAWTs. Though the paper aims to cover most of the turbines that were developed in the past and current ongoing projects, there may be missing projects of which the author is unaware.

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“…Conventional airfoils are modified by incorporating a cavity to enhance the lift at low Reynolds number (Re) [8]. The computational study on the trapped vortex airfoil shows significant improvement in starting torque, yet the performance deteriorates at higher TSR [9].…”

Section: Introductionmentioning

confidence: 99%

On the Mathematical Modelling of Adaptive Darrieus Wind Turbine

Kumar¹,

Ajit²,

Srikanth³

et al. 2017

JPEE

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Darrieus wind turbines are experiencing a renewed interest for their application in decentralized power generation and urban installation. Much attention and research efforts have been dedicated in the past to develop as an efficient standalone Darrieus turbine. Despite these efforts, these vertical axis turbines are still low in efficiency compared to the horizontal axis counterparts. The current architecture of the turbine and their inherent characteristics limit their application in low wind speed areas as confirmed experimentally and computationally by past research. To enable and extend their operation for weak wind flows, a novel design of Adaptive Darrieus Wind Turbine (ADWT) is proposed. The hybrid Darrieus Savonius rotor with dynamically varying Savonius rotor diameter based on the wind speed enables the turbine to start, efficiently operate and stop the turbine at high winds. As the wake of Savonius rotor has a profound impact on the power performance of the combined rotor, the wake of two buckets Savonius rotor in open and closed configuration is reviewed. The current study aims to develop an analytical model to predict the power coefficient and the influence of other design parameters on the proposed design. The formulated analytical model is coded in python, and the results are obtained for the 10 kW rotor. Parametric analysis on the chord length and the diameter of the closed Savonius rotor is performed in search of an optimized diameter to maximize the annual energy output. Blade torque and the rotor torque are evaluated with respect to azimuthal angle and compared with conventional Darrieus rotor. The computed results show that peak power coefficient of ADWT is 13% lower than the conventional Darrieus rotor at the rated wind speed of 10 m/s.

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On the improvement of starting torque of darrieus wind turbine with trapped vortex airfoil

Cited by 14 publications

References 4 publications

Wind Tunnel Validation of Double Multiple Streamtube Model for Vertical Axis Wind Turbine

Wind Tunnel Validation of Double Multiple Streamtube Model for Vertical Axis Wind Turbine

Review on the Evolution of Darrieus Vertical Axis Wind Turbine: Large Wind Turbines

On the Mathematical Modelling of Adaptive Darrieus Wind Turbine

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