Effect of vortices on power output of vertical axis wind turbine (VAWT)

Naseem, Ammar; Uddin, Emad; Ali, Zaib; Aslam, Jawad; Shah, Samiur Rehman; Sajid, Muhammad; Zaidi, Ali A.; Javed, Adeel; Younis, Muhammad Yamin

doi:10.1016/j.seta.2019.100586

Cited by 18 publications

(16 citation statements)

References 19 publications

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“…According to researches accomplished by several investigators, the k − ω Shear Stress Transport (SST) model was employed in the present study, as it has high accuracy prediction (Dragomirescu, 2011; Nasef et al, 2013; Roy and Saha, 2013). To obtain the characteristics of the turbulent flow, the k − ω SST turbulence model utilizes the k − ω model to examine the flow near the wall zone and the k − ε model to examine the flow away from the wall zone (far-field) (ANSYS Inc, 2013; Naseem et al, 2020). Due to the additional specifications, the k − ω SST model is more accurate and reliable for more types of flows (such as airfoils) than the standard k − ω model.…”

Section: Problem Descriptionmentioning

confidence: 99%

Optimal design and sensitivity analysis of airfoil-shaped rotor blade for Savonius wind turbine by using response surface methodology

et al. 2022

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The Savonius wind turbine is cost-effective, simple in structure, and potentially usable in urban areas but suffers from poor efficiency. Further, vortices emerges downward results in a higher rate of exergy loss and lower wind energy to power conversion rate. Thus, the objective of the present study is to enhance the performance of the Savonius wind turbine and reduction of generated friction entropy considering the novel design of airfoil-shaped blade. For this purpose, nine important design parameters of airfoil-shaped blade were chosen and dozen design points were designed based on the Plackett-burman method. After carrying out the screening analysis, the response surface methodology has been used to conduct sensitivity analysis and investigate the higher-order correlations to discover the optimal design of studied airfoil-shaped blade. The obtained results indicate that the optimal design could augment the power coefficient up to 12.89% at TSR = 0.8, compared to conventional semicircular rotor blade.

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Section: Problem Descriptionmentioning

confidence: 99%

Optimal design and sensitivity analysis of airfoil-shaped rotor blade for Savonius wind turbine by using response surface methodology

et al. 2022

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“…The effect of the tip loss was considered while implementing the DMST model. Tip loss designates the propensity for losing the vorticity from any point on the wind turbine where the flow circulation changes, such as the blade's tip, thereby minimizing the efficacy of the blade and, consequently, the output power of the turbine [30]. Prandtl's tip loss factor is popularly utilized for VAWTs [28,31,32], which is given by:…”

Section: Tip Loss Considerationmentioning

confidence: 99%

Aeroelastic analysis of straight-bladed vertical axis wind turbine blade

Fadlalla¹,

Şahin²,

Ouakad³

2022

FME Transactions

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To prevent flutter phenomena in a wind turbine, minimize vibration and increase the blades' life, a systematic analysis is required to investigate the effects between the cyclic aerodynamic loads and the structural performance of the turbine. A dynamic analysis of a straight-bladed vertical axis wind turbine (SB-VAWT) blade is investigated in this paper, and a simplified approach for the energy equations of an Eulerian beam subjected to twist and transverse bending deflections is introduced. The aerodynamic loads are estimated using the double multiple stream tube models. They are introduced into the dynamic model in the aeroelastic coupling, where the structural displacements are fed back to update the aerodynamic loads by utilizing the average acceleration method for the numerical integration of the equations. Reduced order modeling is then imposed based on the first modes of vibration. It is found that the structural displacement has little effect on the aerodynamic loads, and SBVAWTs experience higher transverse displacements compared with those in curved-blade VAWTs.

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“…Mesh independence was achieved with 5.3 million elements for standard cannula and 4.4 million elements for spiral cannula. Furthermore, the wall function (y+) value for both cannula were ensured to be close to 1 [13]. For the simulation, the flow filed were set as steady flow with the inlet flow rate of 5 liter/min and 6 liter/min.…”

Section: Computational Fluid Dynamicmentioning

confidence: 99%

The Effect of Spiral Inducing Chamber to Left Ventricular Assist Device Outflow Cannula

Thomas¹,

Khudzari

Kadir

et al. 2022

IJIE

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The rise of heart failure in the setting of shortage heart donor had brought to the emergence of development of left ventricular assist device (LVAD). However, patients are still encountering severe complications such as stroke and device thrombosis due to the hemodynamic changes. This study aimed to compare the hemodynamic characteristic between the standard and spiral LVAD outflow cannula. Two different anastomosis sites (2cm and 3cm) from sino-tubular junction are used and a spiral inducing chamber is attached to the cannula to promote spiral flow. The result showed that spiral LVAD cannula exhibit a lower output velocity with 37% percentage difference and lower region of low WSS value.

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Effect of vortices on power output of vertical axis wind turbine (VAWT)

Cited by 18 publications

References 19 publications

Optimal design and sensitivity analysis of airfoil-shaped rotor blade for Savonius wind turbine by using response surface methodology

Optimal design and sensitivity analysis of airfoil-shaped rotor blade for Savonius wind turbine by using response surface methodology

Aeroelastic analysis of straight-bladed vertical axis wind turbine blade

The Effect of Spiral Inducing Chamber to Left Ventricular Assist Device Outflow Cannula

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