Computational And Experimental Investigation of Lotus-Inspired Horizontal-Axis Wind Turbine Blade

2021 ◽  
Vol 87 (1) ◽  
pp. 52-67
Author(s):  
Islam Aref Abdelrahman ◽  
Mahmoud Yahia Mahmoud ◽  
Mohand Mostafa Abdelfattah ◽  
Zeyad Hisham Metwaly ◽  
Ahmed Farouk AbdelGawad
Keyword(s):  
Wind Turbine ◽  
Cfd Simulation ◽  
Performance Enhancement ◽  
Horizontal Axis ◽  
Nelumbo Nucifera ◽  
Horizontal Axis Wind Turbine ◽  
Sacred Lotus ◽  
Present Design ◽  
Computational Fluid Dynamics Cfd ◽  
Experimental Findings

In the firm belief that the world needs green, renewable and more efficient energy resources, the present paper is concerned with developing a new design for horizontal-axis wind-turbine (HAWT) blades. The flower of Nelumbo nucifera (Sacred Lotus) was the motive for the present design of a three-blade wind turbine. Nelumbo Nucifera flower has an aerodynamically appropriate structure, which qualifies the flower to be the nature-inspiration for the present research. A computational fluid dynamics (CFD) simulation was applied in order to ensure the ability and eligibility of the proposed solution and estimate real world's results. The performance of the blade airfoil can be improved by applying the Lotus flower's structural design and modifying the blade straightening. The experimental findings demonstrated performance enhancement by 31.7% compared to NACA 2412 airfoil.

scholarly journals Comparison of Computational Fluid Dynamics and Experimental Power Output of a Micro Horizontal-Axis Wind Turbine

2017 ◽  
Vol 7 (2 (S)) ◽  
pp. 11
Author(s):  
Sanjay Nikhade ◽  
Suhas Kongre ◽  
S. B. Thakre ◽  
S. S. Khandare
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Speed ◽  
Wind Turbine ◽  
Cfd Simulation ◽  
Horizontal Axis ◽  
Speed Ratio ◽  
Power Performance ◽  
Horizontal Axis Wind Turbine ◽  
Computational Fluid Dynamics Cfd

This paper presents a combined experimental and Computational Fluid Dynamics (CFD) simulation of Micro wind Turbine with 2.28 meters rotor Diameter is performed using the FLUENT 16.2 WORKBENCH. A Micro Horizontal Axis Three Blade Wind Turbine was designed, developed and tested for power performance on new airfoil AFN2016 Designed. The three blades were fabricated from glass fiber with a rotor swept area of 3.14 sq.m for the 1-meter length of the blade and angle of attack experimentally determined to be 5º.The blade is designed for tip speed ratio (TSR) of 7. The power out measured for wind speed from 3.0m/s to 9.0 m/s. The comparison of the CFD and experimental results on the relationship between the power obtained and the wind speed of the wind turbine at the wind from 3-9 m/s. It can be clearly seen that the experimental data match quite well again with the numerical analysis and they both demonstrated that the power of wind turbine increasing with wind speed increases.

scholarly journals Numerical investigation of stall characteristics for winglet blade of a horizontal axis wind turbine

2021 ◽  
Vol 321 ◽  
pp. 03004
Author(s):  
Shalini Verma ◽  
Akshoy Ranjan Paul ◽  
Anuj Jain ◽  
Firoz Alam
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
Numerical Investigation ◽  
Turbulence Intensity ◽  
Geometric Modeling ◽  
Cfd Simulation ◽  
Lift Coefficient ◽  
Horizontal Axis ◽  
Renewable Energy Resources ◽  
Horizontal Axis Wind Turbine

Wind energy is one of the renewable energy resources which is clean and sustainable energy and the wind turbine is used for harnessing energy from the wind. The blades are the key components of a wind turbine to convert wind energy into rotational energy. Recently, wingtip devices are used in the blades of horizontal axis wind turbine (HAWT), which decreases the vortex and drag, while increases the lift and thereby improve the performance of the turbine. In the present study, a winglet is used at the tip of an NREL phase VI wind turbine blade. Solidworks, Pointwise, and Ansys-Fluent are used for geometric modeling, computational grid generation, and CFD simulation, respectively. The computational result obtained using SST k-ω turbulence modeling is well validated with the experimental data of NREL at 5 and 7 m/s of wind speeds. Numerical investigation of stall characteristics is carried out for wingleted blade at higher turbulence intensity (21% and 25%) and angle of attack (00 to 300 at 50 intervals) at 7 m/s wind speed. The result found that wingletd blade delay stall to 150 for both the cases of turbulence intensity. Increasing the turbulence intensity increases the lift coefficient at stall angle but drag coefficient also increases and thus a lower aerodynamic performance (CL/CD ratio = 13) is obtained. Wingleted blade improves the performance as the intensity of vortices is smaller compared to baseline blade

scholarly journals Investigation of an Innovative Rotor Modification for a Small-Scale Horizontal Axis Wind Turbine

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2649 ◽  
Author(s):  
Artur Bugała ◽  
Olga Roszyk
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Cfd Simulation ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Small Scale ◽  
Horizontal Axis Wind Turbine ◽  
Airflow Distribution

This paper presents the results of the computational fluid dynamics (CFD) simulation of the airflow for a 300 W horizontal axis wind turbine, using additional structural elements which modify the original shape of the rotor in the form of multi-shaped bowls which change the airflow distribution. A three-dimensional CAD model of the tested wind turbine was presented, with three variants subjected to simulation: a basic wind turbine without the element that modifies the airflow distribution, a turbine with a plano-convex bowl, and a turbine with a centrally convex bowl, with the hyperbolic disappearance of convexity as the radius of the rotor increases. The momentary value of wind speed, recorded at measuring points located in the plane of wind turbine blades, demonstrated an increase when compared to the base model by 35% for the wind turbine with the plano-convex bowl, for the wind speed of 5 m/s, and 31.3% and 49% for the higher approaching wind speed, for the plano-convex bowl and centrally convex bowl, respectively. The centrally convex bowl seems to be more appropriate for higher approaching wind speeds. An increase in wind turbine efficiency, described by the power coefficient, for solutions with aerodynamic bowls was observed.

Numerical investigation of active flow control with co-flowing jet in a horizontal axis wind turbine

2020 ◽  
pp. 0309524X2096139
Author(s):  
Fangrui Shi ◽  
Yingqiao Xu ◽  
Xiaojing Sun
Keyword(s):  
Flow Control ◽  
Wind Turbine ◽  
Performance Enhancement ◽  
Active Flow Control ◽  
Three Dimensional ◽  
Horizontal Axis ◽  
Suction Surface ◽  
Horizontal Axis Wind Turbine ◽  
Momentum Coefficient ◽  
Active Flow

In this paper, a three-dimensional numerical simulation of the aerodynamic performance of a horizontal axis wind turbine (HAWT) whose blades are equipped with a new active flow control concept called Co-Flowing Jet (CFJ) is carried out. Numerical results show that the use of CFJ over the blade suction surface can effectively delay flow separation, thus improving the net torque and power output of HAWT. Besides, this increment in the net power produced by the turbine is considerably higher than the power consumed by the CFJ. Thus, the overall efficiency of the HAWT can be greatly increased. Furthermore, influences of different CFJ operating parameters including location of injection port, jet momentum coefficient and slot length on the performance enhancement of a HAWT are also systematically studied and the optimal combination of these parameters to obtain the best possible turbine efficiency throughout a range of different wind speeds has been identified.

Performance Enhancement of Horizontal Axis Wind Turbine Using Numerical Techniques

2021 ◽  
Author(s):  
Poornima Menon ◽  
Srinivas G
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Performance Enhancement ◽  
Horizontal Axis ◽  
Horizontal Wind ◽  
Horizontal Axis Wind Turbine ◽  
Ansys Fluent ◽  
Horizontal Axis Wind Turbines ◽  
Design Requirements ◽  
Nrel Phase Vi

Abstract Wind turbines are one of the most prominent and popular sources of renewable energy, of which, horizontal axis wind turbines (HAWT) are the majorly chosen design for wind machines. These turbines rotate about the horizontal axis which is parallel to the ground. They comprise of aerodynamic blades (generated from the desired airfoil), that may be twisted or tapered as per the design requirements. The blades are attached to a rotor which is located either upwind or downwind. To help wind the orientation of the turbines, the upwind rotors have a tail vane, while the downwind rotors are coned which in turn help them to self-orient. One of the major reasons for the popularity of the horizontal wind turbine, is its ability to generate a larger amount of electricity for a given amount of wind. Due to its popularity, the enhancement in the design of HAWTs, is a major focus area for research. In the present study, a scaled-down CFD model of the NREL Phase VI was validated against the numerical and experimental data. The model used had a dual blade rotor and applied the S809 airfoil. The simulations were carried out using a rotating mesh in ANSYS Fluent. Validation was carried out for 3 velocities — 7m/s, 10m/s and 20m/s. Once validation was carried out, turbine was modified with the addition of vortex generators, in the form of cylindrical protrusions that reduce flow separation.

Comparisons of Horizontal-Axis Wind Turbine Wake Interaction Models

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Jordan M. Wilson ◽  
Cole J. Davis ◽  
Subhas K. Venayagamoorthy ◽  
Paul R. Heyliger
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Horizontal Axis ◽  
Navier Stokes ◽  
Turbulent Structures ◽  
Horizontal Axis Wind Turbine ◽  
Composite Blade ◽  
Pressure Distributions ◽  
Wake Interaction ◽  
Computational Fluid Dynamics Cfd

In this study, Reynolds-averaged Navier–Stokes (RANS) simulations are performed using the k-ε and k-ω shear stress transport (SST) turbulence closure schemes to investigate the interactions of horizontal-axis wind turbine (HAWT) models in the neutrally stratified atmospheric boundary layer (ABL). A comparative study of actuator disk, actuator line, and full rotor models of the National Renewable Energy Laboratory (NREL) 5 MW reference turbine is presented. The open-source computational fluid dynamics (CFD) code openfoam 2.1.0 and the commercial software ansysfluent 13.0 are used for simulations. Single turbine models are analyzed for turbulent structures and wake resolution in the downstream region. To investigate the influence of the incident wind field on very large turbine blades, a high-resolution full rotor simulation is carried out for a single turbine to determine blade pressure distributions. Finally, simulations are performed for two inline turbines spaced 5 diameters (5D) apart. The research presented in this study provides an intercomparison of three dominant HAWT models operating at rated conditions in a neutral ABL using an RANS framework. Furthermore, the pressure distributions of the highly resolved full rotor model (FRM) will be useful for future aeroelastic structural analysis of anisotropic composite blade materials.

scholarly journals Fluid–Structure Interaction Simulations of a Wind Gust Impacting on the Blades of a Large Horizontal Axis Wind Turbine

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 509 ◽  
Author(s):  
Gilberto Santo ◽  
Mathijs Peeters ◽  
Wim Van Paepegem ◽  
Joris Degroote
Keyword(s):  
Wind Turbine ◽  
Fluid Structure Interaction ◽  
Horizontal Axis ◽  
Wind Gust ◽  
Horizontal Axis Wind Turbine ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Computational Fluid Dynamics Cfd ◽  
Computational Structural Mechanics ◽  
Csm Model

The effect of a wind gust impacting on the blades of a large horizontal-axis wind turbine is analyzed by means of high-fidelity fluid–structure interaction (FSI) simulations. The employed FSI model consisted of a computational fluid dynamics (CFD) model reproducing the velocity stratification of the atmospheric boundary layer (ABL) and a computational structural mechanics (CSM) model loyally reproducing the composite materials of each blade. Two different gust shapes were simulated, and for each of them, two different amplitudes were analyzed. The gusts were chosen to impact the blade when it pointed upwards and was attacked by the highest wind velocity due to the presence of the ABL. The loads and the performance of the impacted blade were studied in detail, analyzing the effect of the different gust shapes and intensities. Also, the deflections of the blade were evaluated and followed during the blade’s rotation. The flow patterns over the blade were monitored in order to assess the occurrence and impact of flow separation over the monitored quantities.

scholarly journals Insight into Rotational Effects on a Horizontal Axis Wind Turbine NREL Phase ii Using CFD simulation and inverse BEM

2017 ◽  
Vol 2 (1) ◽  
pp. 29
Author(s):  
Belamadi Riyadh
Keyword(s):  
Wind Turbine ◽  
Phase Ii ◽  
Cfd Simulation ◽  
Stokes Equations ◽  
Large Deviation ◽  
Aerodynamic Characteristics ◽  
Turbine Rotor ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Wind Turbine Rotor

The present work aims to study the aerodynamic characteristics of the NREL phase II rotor (generated only with S809 profile along the span for an untwisted case) that is a horizontal axis downwind wind turbine rotor and which is assumed to stand isolated in the space. The three-dimensional steady-incompressible flow Reynolds Averaged Navier-Stokes equations are solved by using the commercial CFD package ANSYS FLUENT and, the turbulence closure model k-ω with shear stress transport correction was adopted for all computations. The computations were done for wind speed of 7.2, 10.56, 12.85, 16.3, and 9.18 m.s-1. Results of pressure and torque for considered wind turbine rotor have been directly compared to the available experimental data. The comparisons show that CFD results along with the turbulence model can predict the span-wise loading of the wind turbine rotor with reasonable agreement. Secondly, A comparison of lift and drag coefficients was made between the results obtained using the inverse algorithm BEM based on the calculated pressure distributions and the experimental test data. The result show that the general trend is similar for all sections of the scale, however, large deviation exists between the 2-D and   3-D case.

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.

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