Numerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies

Gharali, Kobra; Johnson, David A.

doi:10.1016/j.apenergy.2011.04.037

Cited by 115 publications

(74 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the 'dynamic mesh' technique in CFD, unsteady aerodynamic loads associated with pitching motion [26,[28][29][30] as well as translational motion [27,31] of the airfoil can be simulated. This suggests the feasibility of using CFD techniques to investigate the effects of the vibration-induced unsteady velocity components of the airfoil on the aerodynamic loads.…”

Section: Dynamic Stallmentioning

confidence: 99%

“…They found that the SST k-ω model was superior. Gharali and Johnson [30] simulated the dynamic stall of an S809 airfoil for several Reynolds numbers and a wide range of reduced frequency values. It was found that the behaviour of aerodynamic coefficients, vorticity fields and velocity fields are very sensitive to the reduced frequency.…”

Section: Dynamic Stallmentioning

confidence: 99%

“…The SST k-ω model was chosen for turbulence closure, as it has been successfully applied by other researchers for dynamic stall simulation [29][30][31]38]. The airfoil surface was defined as a 'no-slip' wall.…”

Section: Solver Set-upmentioning

confidence: 99%

See 2 more Smart Citations

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

et al. 2017

View full text Add to dashboard Cite

The blades of a large Horizontal Axis Wind Turbine (HAWT) are subjected to significant vibrations during operation. The vibrations affect the dynamic flow field around the blade and consequently alter the aerodynamic forces on the blade. In order to better understand the influence of blade vibrations on the aerodynamic loads, the dynamic stall characteristics of an S809 airfoil undergoing translational motion as well as pitching motion were investigated using Computational Fluid Dynamics (CFD) techniques. Simulation results indicated that both the out-of-plane and in-plane translational motions of the airfoil affect the unsteady aerodynamic forces significantly. In order to investigate the effects of blade vibration on the aerodynamic load on a large-scale HAWT blade during its operating lifetime, an aerodynamic model based on the Blade Element-Momentum (BEM) theory and the Beddoes-Leishman (B-L) dynamic stall model was proposed. The BEM model was revised to account for the vibration-induced velocity components in the calculation of the effective angle of attack. Aerodynamic load analysis of a 5 MW wind turbine was then performed and the impact of blade vibration on the lifetime aerodynamic fatigue loads was analysed.

show abstract

Section: Dynamic Stallmentioning

confidence: 99%

Section: Dynamic Stallmentioning

confidence: 99%

See 1 more Smart Citation

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The laminar boundary layer on S809 airfoil blade was analyzed experimentally at zero attack angle, demonstrating that the separation bubble covers 19.6% of the chord length and a flow control technique is required to reduce the losses occurring due to separation, Abdulrahim et al [90]. An experimental study using an active flow control technique was carried out by Gharali and Johnson [91]. A three-bladed horizontal axis wind turbine rotor was tested in an open jet wind tunnel.…”

Section: Experimental Approach To Blade Design and Analysismentioning

confidence: 99%

“…An experimental study using an active flow control technique was carried out by Gharali and Johnson [91]. A three-bladed horizontal axis wind turbine rotor was tested in an open jet wind tunnel.…”

Section: Experimental Approach To Blade Design and Analysismentioning

confidence: 99%

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

et al. 2018

View full text Add to dashboard Cite

Among renewable sources of energy, wind is the most widely used resource due to its commercial acceptance, low cost and ease of operation and maintenance, relatively much less time for its realization from concept till operation, creation of new jobs, and least adverse effect on the environment. The fast technological development in the wind industry and availability of multi megawatt sized horizontal axis wind turbines has further led the promotion of wind power utilization globally. It is a well-known fact that the wind speed increases with height and hence the energy output. However, one cannot go above a certain height due to structural and other issues. Hence other attempts need to be made to increase the efficiency of the wind turbines, maintaining the hub heights to acceptable and controllable limits. The efficiency of the wind turbines or the energy output can be increased by reducing the cut-in-speed and/or the rated-speed by modifying and redesigning the blades. The problem is tackled by identifying the optimization parameters such as annual energy yield, power coefficient, energy cost, blade mass, and blade design constraints such as physical, geometric, and aerodynamic. The present paper provides an overview of the commonly used models, techniques, tools and experimental approaches applied to increase the efficiency of the wind turbines. In the present review work, particular emphasis is made on approaches used to design wind turbine blades both experimental and numerical, methodologies used to study the performance of wind turbines both experimentally and analytically, active and passive techniques used to enhance the power output from wind turbines, reduction in cut-in-speed for improved wind turbine performance, and lastly the research and development work related to new and efficient materials for the wind turbines.

show abstract

On the role of surface roughness in the aerodynamic performance and energy conversion of horizontal wind turbine blades: a review

Zidane

Saqr

Swadener

et al. 2016

Int. J. Energy Res.

View full text Add to dashboard Cite

Summary Renewable energy is one of the main pillars of sustainable development, especially in developing economies. Increasing energy demand and the limitation of fossil fuel reserves make the use of renewable energy essential for sustainable development. Wind energy is considered to be one of the most important resources of renewable energy. In North African countries, such as Egypt, wind energy has an enormous potential; however, it faces quite a number of technical challenges related to the performance of wind turbines in the Saharan environment. Seasonal sand storms affect the performance of wind turbines in many ways, one of which is increasing the wind turbine aerodynamic resistance through the increase of blade surface roughness. The power loss because of blade surface deterioration is significant in wind turbines. The surface roughness of wind turbine blades deteriorates because of several environmental conditions such as ice or sand. This paper is the first review on the topic of surface roughness effects on the performance of horizontal‐axis wind turbines. The review covers the numerical simulation and experimental studies as well as discussing the present research trends to develop a roadmap for better understanding and improvement of wind turbine performance in deleterious environments. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

Numerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies

Cited by 115 publications

References 13 publications

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

On the role of surface roughness in the aerodynamic performance and energy conversion of horizontal wind turbine blades: a review

Contact Info

Product

Resources

About