A simulation study on airfoils using VAWT design for low wind speed application

In this paper, an analysis of basic airfoils profile for micro and small-scale horizontal axis wind turbine (HAWT) has been studied for different angle-of-attack and fixed Reynolds number. For turbine blade modeling, the data used is from National advisory committee of aeronautics (NACA) of five digit airfoil series. The comprehensive relationship between optimal angle-of-attack and Reynolds number has been analyzed. A low or high lift-to-drag ratio ( / ) can be identified at different angle-of-attack . The computational fluid dynamics analysis of NACA 63-415 airfoil is carried out at different angle-of-attack at wind speed 5 m/s using ANSYS/Fluent software. The pressure, turbulence and velocity distribution plots have been observed.Index Terms-Angle-of-attack ( ), coefficient of power ( ), horizontal axis wind turbine (HAWT), lift-to-drag ( / ) ratio, national advisory committee of aeronautics (NACA) series, reynolds number (Re) and tip speed ratio (TSR).

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“…= / , where is the chord length and is the radius of the rotor. The TSR mainly depend on the solidity ratio [7].…”

Section: Theory Of Bladementioning

confidence: 99%

Micro and small-scale HAWT blades airfoils study through CFD for low wind applications

Chaudhary

Nayak

2015

2015 Annual IEEE India Conference (INDICON)

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“…The maximum 𝐶 𝐷 values were calculated as 0,1515, 0,1494, 0,3287 and 0,3183 for 𝑀1, 𝑀2, 𝑀3 and 𝑀4 design, respectively. In the literature, various studies can be found that investigated an airfoil's aerodynamic performance by calculating 𝐶 𝐿 /𝐶 𝐷 ratios [13,17,18]. So, in this study, the aerodynamic characteristics of different models were also examined in terms of the 𝐶 𝐿 /𝐶 𝐷 ratio.…”

Section: Figure 6 Lift Coefficient (𝐶 𝐿 ) Of Created Modelsmentioning

confidence: 99%

Investigation of a Rib Structure Effect on the Aerodynamic Performance of a Plain Flapped Symmetrical Airfoil

Kaya

2023

Journal of Polytechnic

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In this paper, two-dimensional computational fluid dynamics analyses were conducted to examine the rib effect on the performance of the NACA 0018 plain flapped airfoil. A mesh independence study was carried out and the Spalart-Allmaras turbulence model was selected for validation. Four various airfoil models were designed: M1 (airfoil without plain flap and rib structure), M2 (airfoil with rib structure), M3 (airfoil with a plain flap) and M4 (airfoil with a rib structure and plain flap). The performance of designed airfoils was calculated in terms of lift-to-drag (C_L/C_D) ratio. As a result, the plain flap significantly increased the lift coefficient (C_L) and drag coefficient (C_D). While the rib structure enhanced the aerodynamic performance of the non-flapped airfoil when the attack angle was greater than 12°, it increased the performance of the plain flapped airfoil at almost all attack angles. Furthermore, it was seen that the rib structure decreased C_D values of plain flapped airfoil at all attack angles and increased C_L values of plain flapped airfoil when the attack angle was greater than 2°.

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“…Tm is the mechanical torque of the turbine in N.m and ωm is the speed of the turbine mechanical angle in rad s -1 [9]. Tip speed ratio can be expressed in Equation 8as follows: (8) Where r is the radius of the turbine, vw is the wind speed and ω is the turbine rotational speed [10]. Mechanical angular velocity can be represented in Equation (9) as follows: (9) Where J is the combination of inertia of the wind turbine and rotor (kg m -2 ), Te is electromagnetic torque (N m), and B is rotor friction (N m s rad -1 ) [10].…”

Section: Vawt Modellingmentioning

confidence: 99%

Vertical Axis Wind Turbine Improvement using DC-DC Boost Converter

Khairunnisa¹,

Rachman²,

Yohanes³

et al. 2020

E3S Web Conf.

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Vertical axis wind turbine (VAWT) can be operated in any direction of wind speed, but it has low rotation. To improve the performance of VAWT in which low rotation, this paper presents a simple control strategy of VAWT using a DC-DC boost converter to tap constant voltage in a standalone application. The main objective of this research is to maintain a constant output voltage of converter despite variation input voltage affected by variable wind speed. A simple proportional-integral (PI) controller has been used for a DC-DC boost converter and tested in MATLAB-Simulink environment, with the closed-loop system of the converter maintain constant output voltage although the wind speed is kept changing. The PI controller obtains the feedback from the output voltage of the boost converter to produce the correct pulse width modulation (PWM) duty cycle and trigger the metal oxide semiconductor field effect transistor (MOSFET) following the reference voltage of the turbine. This system has suppressed the value of overshoot and increased the efficiency of wind turbines as 34 %.

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A simulation study on airfoils using VAWT design for low wind speed application

Cited by 11 publications

References 2 publications

Micro and small-scale HAWT blades airfoils study through CFD for low wind applications

Micro and small-scale HAWT blades airfoils study through CFD for low wind applications

Investigation of a Rib Structure Effect on the Aerodynamic Performance of a Plain Flapped Symmetrical Airfoil

Vertical Axis Wind Turbine Improvement using DC-DC Boost Converter

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