scholarly journals Investigation Effects of Different Wind Turbine Designs on Air Flow and Generated Power

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Hazim Moria ◽  
Abdalfadel Younis ◽  
Monaem Elmnifi ◽  
Mohammad Rasidi Rasani
Keyword(s):  
Wind Turbine ◽  
Air Flow ◽  
Horizontal Axis ◽  
Main Rotor ◽  
Circular Frame ◽  
Wind Velocities

This paper describes a study of different designs for the wind turbine. The basic wind turbine configuration with a second smaller rotor mounted in the front of the main rotor to extract as much force as possible from the flow. The wind turbine used in all the simulations was an upwind turbine with a 3 MW horizontal axis. The behaviors of pressures, velocities, and power generated were simulated and discussed. Three different configurations have been designed and simulated in SolidWorks at four different wind velocities ranging from 10 to 40 mph with an increment of 10 mph. The results revealed that the power generated by the rotor of the dual turbine to the rotor of the conventional turbine, the power created by the conventional turbine’s rotor is higher even though the size is the same. Furthermore, adding a diffuser equipped with a plat-type circular frame achieved the best performance. Finally, some numbers and figures are highlighted, and a conclusion is stated to summarize the results.

scholarly journals Ducted Wind Turbine in Generating Set Air Flow

2022 ◽  
Author(s):  
Ivan Anzanello
Keyword(s):  
Internal Combustion Engine ◽  
Wind Turbine ◽  
Combustion Engine ◽  
Air Flow ◽  
Internal Combustion ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Electricity Grid ◽  
Generating Set ◽  
Wind Variability

The growing need to use renewable sources and the current difficulty in spreading the electricity grid in a widespread manner raise the question of how to respond to the need for more electricity immediately. The idea behind this study is to power a horizontal axis wind turbine with the air flow generated for cooling a stationary internal combustion engine. The power extracted from this solution is significantly lower than that of the internal combustion engine (about 0.3%) and could be advantageous only in limited contexts. Installation costs are limited because many elements deriving from wind variability can be removed or simplified.

scholarly journals A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

2020 ◽  
pp. 1-14
Author(s):  
Marcin Augustyn
Keyword(s):  
Boundary Layer ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Computational Procedure ◽  
Horizontal Axis ◽  
The Self ◽  
Main Rotor ◽  
Aerodynamic Coefficients ◽  
Horizontal Axis Wind Turbine ◽  
Design Structure

The proposed self-adjusting mechanism consists of a carousel rotor with a vertical axis consisting of two kinematically connected flat blades. The torque of this rotor can change the position of the directing unit and additionally the position of the main propeller in order to direct the wind stream or save the main rotor when the wind is too strong. The theory, principles of operation, and the properties of the self-adjusting system were illustrated by formulas and graphs. Based on research conducted in a boundary layer wind tunnel, the values of the aerodynamic coefficients of the flat blades were determined, and then the power and propeller torque of the rotor were found as a function of the angle of wind attack. A computational procedure provides kinematical and force relations as well as the resulting torque diagrams of the rotor. An example of the use and the design structure of a self-adjusting unit in the case of a horizontal axis wind turbine is presented.

scholarly journals Aerodynamic analysis of backward swept in HAWT rotor blades using CFD

2018 ◽  
Vol 7 (3) ◽  
pp. 241-249 ◽  
Author(s):  
Mohammad Sadegh Salari ◽  
Behzad Zarif Boushehri ◽  
Mehrdad Boroushaki
Keyword(s):  
Renewable Energy ◽  
Wind Turbine ◽  
Reference Frame ◽  
Output Power ◽  
Horizontal Axis ◽  
Rotor Blades ◽  
Horizontal Axis Wind Turbine ◽  
Axial Thrust ◽  
Aerodynamic Analysis ◽  
Wind Velocities

The aerodynamical design of backward swept for a horizontal axis wind turbine blade has been carried out to produce more power at higher wind velocities. The backward sweep is added by tilting the blade toward the air flow direction. Computational Fluid Dynamics (CFD) calculations were used for solving the conservation equations in one outer stationary reference frame and one inner rotating reference frame, where the blades and grids were fixed in reference to the rotating frame. The blade structure was validated using Reynolds Averaged Navier-Stokes (RANS) solver in a test case by the National Renewable Energy Laboratory (NREL) VI blades results. Simulation results show considerable agreement with the NREL measurements. Standard K-ε turbulence model was chosen for simulations and for the backward swept design process. A sample backward sweep design was applied to the blades of a Horizontal Axis Wind Turbine (HAWT) rotor, and it is obtained that although at the lower wind velocities the output power and the axial thrust of the rotor decrease, at the higher wind velocities the output power increases while the axial thrust decreases. The swept blades have shown about 30 percent increase in output power and about 12 percent decrease in thrust at the wind speed of 14 m/s.Article History: Received June 23rd 2018; Received in revised form Sept 16th 2018; Accepted October 1st 2018; Available onlineHow to Cite This Article: Salari, M.S., Boushehri, B.Z. and Boroushaki, M. (2018). Aerodynamic Analysis of Backward Swept in HAWT Rotor Blades Using CFD. International Journal of Renewable Energy Development, 7(3), 241-249.http://dx.doi.org/10.14710/ijred.7.3.241-249

Study of Horizontal Axis Wind Turbine Blade in Virtual Wind Tunnel Simulator

2013 ◽  
Author(s):  
Radostina Petrova ◽  
Hirpa G. Lemu ◽  
Ioan Larion
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Horizontal Axis ◽  
Wind Pressure ◽  
Horizontal Axis Wind Turbine ◽  
Dead Weight ◽  
Wind Velocities ◽  
Computational Fluid Dynamics Cfd ◽  
Model Computer ◽  
Computer Resources

The article presents a 3D model analysis of a single blade for a horizontal axis wind turbine (HAWT). The analysis focuses on calculation of the wind pressure on the blade under different wind velocities and directions within the range of −45 deg. to +45 deg. using virtual wind tunnel simulators based on the Computational Fluid Dynamics (CFD) approach. Furthermore, the study deals with a linear modal analysis of the loaded blade subjected to aerodynamic loads, dead weight and angular velocity of the rotor. By modeling the blade as a thick shell, composite shell and through solid spatial finite elements (FE), a comparison of the final results regarding the modal characteristics of the blade is discussed. The objective of this comparison is to develop better understanding of the blade performance and find the best ways for computer analysis regarding the complexity of the model, computer resources and accuracy of the results. The authors consider this analysis and the corresponding conclusions as a crucial perquisite for further geometrical optimization of the flap-wise rigidity of the blade aiming reduction of the strain energy and the noise. The results of the study indicate that different solutions are possible to implement in achieving almost equal flap-wise rigidity along the blade.

EXPERIMENTAL AND ANALYTICAL STUDIES OF VERTICAL AXIS WIND TURBINES

2018 ◽  
pp. 51-58
Author(s):  
B. P. Khozyainov
Keyword(s):  
Wind Turbine ◽  
Flow Velocity ◽  
Wind Power ◽  
Wind Turbines ◽  
Power Efficiency ◽  
Air Flow ◽  
Geometrical Parameters ◽  
Wind Speeds ◽  
Analytical Studies ◽  
Air Flow Velocity

The article carries out the experimental and analytical studies of three-blade wind power installation and gives the technique for measurements of angular rate of wind turbine rotation depending on the wind speeds, the rotating moment and its power. We have made the comparison of the calculation results according to the formulas offered with the indicators of the wind turbine tests executed in natural conditions. The tests were carried out at wind speeds from 0.709 m/s to 6.427 m/s. The wind power efficiency (WPE) for ideal traditional installation is known to be 0.45. According to the analytical calculations, wind power efficiency of the wind turbine with 3-bladed and 6 wind guide screens at wind speedsfrom 0.709 to 6.427 is equal to 0.317, and in the range of speed from 0.709 to 4.5 m/s – 0.351, but the experimental coefficient is much higher. The analysis of WPE variations shows that the work with the wind guide screens at insignificant average air flow velocity during the set period of time appears to be more effective, than the work without them. If the air flow velocity increases, the wind power efficiency gradually decreases. Such a good fit between experimental data and analytical calculations is confirmed by comparison of F-test design criterion with its tabular values. In the design of wind turbines, it allows determining the wind turbine power, setting the geometrical parameters and mass of all details for their efficient performance.

Withdrawal: Computations of Aerodynamic Behaviour of Small Horizontal Axis Wind Turbine with NACA4418 airfoil

2019 ◽  
Author(s):  
Essam E. Khalil ◽  
Gamal E. ElHarriri ◽  
Eslam E. AbdelGhany ◽  
Moemen E. Farghaly
Keyword(s):  
Wind Turbine ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine

scholarly journals Canard optimization for enhancing the performance of small horizontal axis wind turbine at low wind speeds

2020 ◽  
Vol 37 ◽  
pp. 63-71
Author(s):  
Yui-Chuin Shiah ◽  
Chia Hsiang Chang ◽  
Yu-Jen Chen ◽  
Ankam Vinod Kumar Reddy
Keyword(s):  
Wind Turbine ◽  
Urban Areas ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Peak Performance ◽  
Small Scale ◽  
Horizontal Axis Wind Turbine ◽  
Wind Speeds ◽  
Optimum Parameters ◽  
Low Wind Speeds

ABSTRACT Generally, the environmental wind speeds in urban areas are relatively low due to clustered buildings. At low wind speeds, an aerodynamic stall occurs near the blade roots of a horizontal axis wind turbine (HAWT), leading to decay of the power coefficient. The research targets to design canards with optimal parameters for a small-scale HAWT system operated at variable rotational speeds. The design was to enhance the performance by delaying the aerodynamic stall near blade roots of the HAWT to be operated at low wind speeds. For the optimal design of canards, flow fields of the sample blades with and without canards were both simulated and compared with the experimental data. With the verification of our simulations, Taguchi analyses were performed to seek the optimum parameters of canards. This study revealed that the peak performance of the optimized canard system operated at 540 rpm might be improved by ∼35%.

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