Investigation of Effect of Cambered Blades on Darrieus VAWTs

Qamar, Sayyad Basim; Janajreh, Isam

doi:10.1016/j.egypro.2017.03.353

Cited by 22 publications

(8 citation statements)

References 7 publications

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“…The simulation was carried out considering a range of TSR from λ = 1.5 to λ = 5. It is well known that the optimum value for cambered airfoil is situated between these chosen values (Qamar and Janajreh, 2017b). The TSR is calculated as follows…”

Section: Data Processing Methodsmentioning

confidence: 99%

A comprehensive analysis of aerodynamic flow around H-Darrieus rotor with camber-bladed profile

et al. 2018

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Improving the H-Darrieus rotor is often followed by the investigation of the influence of the turbine’s parameter design, notably, the aspect ratio, the solidity ( σ), the tip speed ratio, and the airfoil profile shape. In this work, we are interested in both the aerodynamic flows around a straight cambered blade profile and the rotor turbine wake separation of a Darrieus vertical axis wind turbine. The aim of this study is to better understand the evolution of the instantaneous torque and the generated-separated blade vortex during full rotation. Indeed, a three-dimensional computational fluid dynamics model of a vertical axis wind turbine with a straight cambered blade profile NACA4312 operating over a large range of tip speed ratio is considered. The flows are governed by Reynolds-averaged Navier–Stokes equations and the turbulence is modeled with shear stress transport formulations k- ω. This research revealed a high correlation between the evolution of the torque coefficient and the generated-separated blades vortex. In particular, a good correlation between the maximum tip vortices size and the torque coefficient peak is demonstrated.

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Section: Data Processing Methodsmentioning

confidence: 99%

A comprehensive analysis of aerodynamic flow around H-Darrieus rotor with camber-bladed profile

et al. 2018

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“…It has a relatively high camber, which allows it to generate lift at low angles of attack. 63 Symmetrical airfoils are commonly used in designing VAWT for their low manufacturing cost, producing equal aerodynamic lift from both sides of airfoil during a full revolution of turbine and generating lift with change in wind direction. 59,62 The Torque ripple parameter (γ) that determines stability and smoothness of rotor operation is defined by the use of the maximum torque (T max ) and the average torque (T avg ) from Equation 43.…”

Section: Naca Airfoil Shapes and Its Effects On Wind Turbine Operatin...mentioning

confidence: 99%

Innovative multiobjective optimization of a curved‐blade vertical axis wind turbine modeled by modified double multiple streamtube method

Sanaye,

Hosseinkhani

2024

Energy Science & Engineering

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The attractive specifications of vertical axis wind turbine (VAWT) are its operating with low noise and wind in various directions. To achieve a higher performance of these turbines, modeling of a curved‐blade VAWT by the modified double multiple streamtube (DMST) method and optimizing this wind turbine are performed. The power coefficient and the total normal force acting on blades were selected as two objective functions. Minimizing the normal force acting on turbine blades as the second objective function was not observed in the open literature. The amount of normal force is crucial in the structural design of VAWT because it generates both the bending moment on blades and forces on supporting arms of VAWT. Another innovation of this study is to consider the shape coefficient parameter that determines the shape of the rotor geometry as a design variable in optimization procedure. A 3 m height curved‐blade VAWT type was optimized by this multi‐objective optimization technique. The optimum values of the design variables obtained by the Genetic Algorithm were selecting an elliptical rotor geometry, pitch angle −1.4°, diameter/height 1.3, blade aspect ratio 19.8, tip speed ratio 4.3 and selecting three blades which could provide a power coefficient of 0.49 and a normal force of 158.7 N.

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“…To get the torque, the calculation is carried out using the following equations. The amount of power extracted from the wind is directly dependent on the tip speed ratio, which can be defined as the ratio between the tangential speed at the blade tip (𝜔) and the actual wind speed [26]. Tip speed ratio can be formulated as follows:…”

Section: Determination Of Mechanical Powermentioning

confidence: 99%

Pitch Blade Control Prototype Design for Vertical Axis Wind Power Plant

Rajagukguk

Arafanaldy

Anhar

et al. 2022

Jurnal Ilmiah Teknik Elektro Komputer Dan Informatika

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One alternative energy that is easy and can be used is wind. This energy is utilized through wind turbines which have two general types, namely horizontal and vertical axis wind turbines. This wind turbine can move by utilizing the energy available in the wind to rotate the turbine. The problem with wind turbines is self-starting is difficult to achieve. This can be caused by several factors, such as slow wind speed and erratic wind direction. In addition, wind turbines also have low-efficiency values. Therefore, our contribution to this research is to design a blade controller on a vertical axis wind turbine. This blade control is designed by utilizing the pitch angle by using actuators that are applied to each blade based on the Proportional, Integral & Derivative (PID) algorithm. The PID algorithm is used to find the appropriate pitch angle value on a vertical axis wind turbine. The effect of the pitch angle on the wind turbine serves to maintain the mechanical power value by the available power in the wind. This research was conducted using a simulation method (MATLAB). In this study, it was found that this wind energy conversion simulation produces maximum mechanical power when the wind speed varies is 1723 Watt and when the wind speed is 7 m/s, mechanical power achieved is 362.595 Watt.

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Investigation of Effect of Cambered Blades on Darrieus VAWTs

Cited by 22 publications

References 7 publications

A comprehensive analysis of aerodynamic flow around H-Darrieus rotor with camber-bladed profile

A comprehensive analysis of aerodynamic flow around H-Darrieus rotor with camber-bladed profile

Innovative multiobjective optimization of a curved‐blade vertical axis wind turbine modeled by modified double multiple streamtube method

Pitch Blade Control Prototype Design for Vertical Axis Wind Power Plant

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