Modeling dynamic stall of a straight blade vertical axis wind turbine

Almohammadi, K.M.; Ingham, D.B.; Ma, Lin; Pourkashanian, Mohamed

doi:10.1016/j.jfluidstructs.2015.06.003

Cited by 75 publications

(37 citation statements)

References 49 publications

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“…For example, in a 2.5 MW wind turbine, simulated erosion experiments have shown that leading edge erosion can severely affect the airfoil performance to such an extent that, depending on the severity of erosion, up to 25% annual energy loss can be expected [10]. Other studies have confirmed the impact of surface roughness on aerodynamic force coefficients and stall characteristics [11,12,13,14] and consequently on aerodynamic performance [15,16] as well as dynamic instabilities [17]. Evidence of leading edge erosion can be found on the blades' surface in as early as two to three years after installation [5,18].…”

Section: Introductionmentioning

confidence: 93%

A computational framework for the analysis of rain-induced erosion in wind turbine blades, part I: Stochastic rain texture model and drop impact simulations

Amirzadeh

Louhghalam

Raessi

et al. 2017

Journal of Wind Engineering and Industrial Aerodynamics

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In the past decade, the power output of wind turbines has increased significantly. This increase has been primarily achieved through manufacturing larger blades resulting in high blade tip velocities and increased susceptibility to rain erosion. This paper is the first part in a two-part paper that presents a framework for the analysis of rain erosion in wind turbine blades. Two ingredients of the framework are presented. A stochastic rain texture model is developed to generate three-dimensional fields of raindrops consistent with the rainfall history at the turbine location by integrating the micro-structural properties of rain, i.e. raindrops size and spatial distribution with its integral properties such as the relationship between the average volume fraction of raindrops and rain intensity. An in-house GPU-accelerated computational fluid dynamics model of free-surface flows and a multi-resolution strategy are used to calculate the drop impact pressure as a function of time and space. An interpolation scheme is finally proposed to find the time evolution of impact pressure profile for any given drop diameter using the high fidelity simulation results, significantly reducing the computational cost. Other ingredients of the framework pertaining to drop impact-induced stresses and the blade coating fatigue life are presented in part II.

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Section: Introductionmentioning

confidence: 93%

A computational framework for the analysis of rain-induced erosion in wind turbine blades, part I: Stochastic rain texture model and drop impact simulations

Amirzadeh

Louhghalam

Raessi

et al. 2017

Journal of Wind Engineering and Industrial Aerodynamics

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show abstract

“…According to their results, the inertial contribution to the blade deformation is much higher with respect to the aerodynamic one for all the analyzed blade shell thicknesses and the displacements is higher at blade trailing edge than at leading edge. Almohammadi et al 140 examined the blade dynamic stall of the H-Darrieus turbine using two different turbulence models and found the stall was predicted earlier when the SST transitional model was applied than for the SST and their study also revealed that the turbine performance could be improved by controlling the laminar separation bubble on the blades.…”

Section: The (Sst) Turbulence Modelmentioning

confidence: 99%

A review of H-Darrieus wind turbine aerodynamic research

Ingram

Dominy

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The H-Darrieus vertical axis turbine is one of the most promising wind energy converters for locations where there are rapid variations of wind direction, such as in the built environment. The most challenging considerations when employing one of these usually small machines are to ensure that they self-start and to maintain and improve their efficiency. However, due to the turbine's rotation about a vertical axis, the aerodynamics of the turbine are more complex than a comparable horizontal axis wind turbine and our knowledge and understanding of these turbines falls remains far from complete. This paper provides a detailed review of past and current studies of the H-Darrieus turbine from the perspective of design parameters including turbine solidity, blade profile, pitch angle, etc. and particular focus is put on the crucial challenge to design a turbine that will self-start. Moreover, this paper summarizes the main research approaches for studying the turbine in order to identify successes and promising areas for future study.

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“…Shahizare et al [21] studied the output power of VAWTs in urban areas by examining the effects of the omnidirectional angle. Gharali and Johnso [22] and Almohammadi et al [23] studied the 2D dynamic stall of a blade and a complete straight blade respectively, and Gharali stated that a threedimensional (3D) model was a better choice for studying the dynamic stall phenomenon. Lei et al [24] performed an unsteady CFD numerical analysis on the performance of an offshore VAWT floating in different amplitudes and pitch periods.…”

Section: Review Analysismentioning

confidence: 99%

Experimental and numerical analysis of a novel Darrieus rotor with variable pitch mechanism at low TSR

Zouzou

Dobrev

Massouh

et al. 2019

Energy

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a b s t r a c tThe Darrieus vertical axis wind-turbine (VAWT) has been the subject of numerous recent studies aimed at improving its aerodynamic performance in order to locate it in urban areas. This article is devoted to the study of an original VAWT with variable-pitch and low tip speed ratio TSR which is favorable to noise reduction and can operate at low velocity wind. The aerodynamic performance of this turbine is studied experimentally in wind tunnel as well as by CFD. In order to obtain the 3D-flow field around the wind turbine rotor, the numerical simulations are performed by means of detached eddy simulation method (DES). The simulation of pitch variation is made possible by using sliding-mesh method. Thus a specially created program adapts the pitch depending on the blade azimuthal position during rotation. The obtained results show that adapted pitch blades are preferable because they permit to obtain a power coefficient Cp that rivals other VAWT in the case of TSR < 1. The maximum torque fluctuation during rotation is lower in the case of adapted variable-pitch compared to fixed-pitch and thus the maximum aerodynamic loads on the structure can be reduced. Moreover, the pitch adaptation leads to lower interaction effects between the upstream-blade wake and down-stream blades.

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Modeling dynamic stall of a straight blade vertical axis wind turbine

Cited by 75 publications

References 49 publications

A computational framework for the analysis of rain-induced erosion in wind turbine blades, part I: Stochastic rain texture model and drop impact simulations

A computational framework for the analysis of rain-induced erosion in wind turbine blades, part I: Stochastic rain texture model and drop impact simulations

A review of H-Darrieus wind turbine aerodynamic research

Experimental and numerical analysis of a novel Darrieus rotor with variable pitch mechanism at low TSR

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