An investigation of flow fields around flanged diffusers using CFD

Abe, Ken; Ohya, Yuji

doi:10.1016/j.jweia.2003.12.003

Cited by 171 publications

(108 citation statements)

References 14 publications

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“…The authors published several other papers on the numerical and experimental studies they did on the flanged diffuser (Abe and Ohya, 2004;Abe et al, 2006;Ohya and Karasudani, 2010;Ohya et al, 2008;Toshimitsu et al, 2008). Widnall (2009) following the method of Lewis (1991), developed an incompressible potential flow vortex method to study the flow field in a ducted wind turbine.…”

Section: Diffuser Augmented Wind Turbinesmentioning

confidence: 99%

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

2015

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Section: Diffuser Augmented Wind Turbinesmentioning

confidence: 99%

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

2015

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“…Viewed as a whole, the collection-acceleration device consists of a venturi-shaped structure with a brim [8][9][10]. As for other parameters, we have examined the diffuser opening angle, the hub ratio, and the center-body length [10][11][12]. Then the optimal shape of a brimmed diffuser was found [10].…”

Section: Idea Of a Ring-type Plate Which Forms Vortices (It Is Calledmentioning

confidence: 99%

A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology

2010

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Abstract:We have developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser has demonstrated power augmentation by a factor of about 2-5 compared with a bare wind turbine, for a given turbine diameter and wind speed. This is because a low-pressure region, due to a strong vortex formation behind the broad brim, draws more mass flow to the wind turbine inside the diffuser shroud.

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“…•\ 336•\ (1) (2) Here Z is the number of blades, c is the chord length, r is the position in the radius direction , ,o is the density, and /3=tan-I(ux/(r co-u a)). In Eqs.…”

Section: Methodsmentioning

confidence: 99%

“…For this purpose, we have studied the shape of an airfoil and a wind-energy collecting structure (we call it "wind -lens") suitable for SWVAWT. In the past studies, suitable airfoils were investigated by Seki [1] and Ishimatu et al [2]. However, it is still unclear about suitable airfoils.…”

Section: Introductionmentioning

confidence: 99%

MC3 Wind Energy And Topography1

Takahashi

Ohya

Karasudani

et al. 2006

Wind Engineers, JAWE

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Numerical simulations and wind tunnel experiments were carried out to study airfoils and a wind-energy collecting structure (wind-lens) suitable for Straight Wing Vertical Axis Wind Turbines (SWVAWT). The aim of this study is to increase the output power coefficients of SWVAWT. The numerical method is a direct numerical simulation (DNS) based on the finite difference method. The results of DNS revealed that symmetry airfoils are better than asymmetry airfoils for the output performance. In the wind tunnel experiment, the results of output performance test showed that the best airfoil is NACA0024. We designed a wind-lens and applied it to SWVAWT. In the wind tunnel experiments, the output power coefficients of SWVAWT with a wind-lens were more than 2 times as large as those of a SWVAWT only. We made clear the effect of the wind-lens on the output performance by DNS.

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An investigation of flow fields around flanged diffusers using CFD

Cited by 171 publications

References 14 publications

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology

MC3 Wind Energy And Topography1

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