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

Ohya, Yuji; Karasudani, Takashi

doi:10.3390/en3040634

Cited by 285 publications

(216 citation statements)

References 12 publications

Supporting

Mentioning

185

Contrasting

Unclassified

Order By: Relevance

“…The performance of the optimized plain conical DAWT was 2.5 times that of the BWT. The same result was also found by [15,16] for a flanged-diffuser. This finding clearly shows that an optimized plain conical DAWT can produce the power output comparable to that of a flanged-DAWT.…”

Section: Resultssupporting

confidence: 79%

Optimization of the Power Output of a Bare Wind Turbine by the Use of a Plain Conical Diffuser

2018

View full text Add to dashboard Cite

Abstract:A plain conical diffuser is optimized to augment the wind speed at the throat of the diffuser. The diffuser is used in the construction of a diffuser augmented wind turbine (DAWT) to augment the power output of a bare wind turbine (BWT). Experiments with empty conical diffusers were done to determine optimum geometrical parameters for the diffuser to achieve maximum wind speed augmentation. Using the obtained optimum geometrical parameters, an optimized plain conical DAWT was designed, constructed, and field tested. A twin decentralized wind energy system which comprised a BWT and the optimized plain conical DAWT was erected. The electrical power output from these systems was measured and compared. The optimized plain conical DAWT reduced the cut-in wind speed of a BWT from 2.5 m/s to 1.6 m/s. The power output was increased by a factor of 2.5. This power output is comparable to that of flanged diffusers. However, flanged-DAWTs are more inert due to the addition of the flange. Its response to wind speed and direction is slow as compared to plain conical DAWT. Thus, it cannot fully exploit the potential of the wind. Also, the addition of the flange increases its production cost. Therefore, plain conical DAWT can replace flanged-DAWT in wind power augmentation.

show abstract

Section: Resultssupporting

confidence: 79%

Optimization of the Power Output of a Bare Wind Turbine by the Use of a Plain Conical Diffuser

2018

View full text Add to dashboard Cite

show abstract

“…He further concluded the best shape for the exit of a shroud is a radial flap, an idea Shives and Crawford (2011) also found in their numerical study. A flange shaped shroud has been investigated in several studies (Abe et al, 2005;Ohya and Karasudani, 2010). A separation region with strong vortices occurs behind the brim which creates a low pressure region at the shroud's exit as shown in Figure 5.4.…”

Section: Power Coefficientsmentioning

confidence: 99%

“…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

View full text Add to dashboard Cite

show abstract

“…Currently, the increase in the concentration of greenhouse gases emission has caused a notable rise of temperature in the earth's atmosphere (global warming) and thus widespread melting of snow and ice at the polar ice caps [7]. Due to the concerns on environmental issues, the development and application of renewable and clean new energy are certainly expected [8].…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator

et al. 2015

View full text Add to dashboard Cite

A vertical axis wind turbine (VAWT) was positioned at the discharge outlet of a cooling tower electricity generator. To avoid a negative impact on the performance of the cooling tower and to optimize the turbine performance, the determination of the VAWT position in the discharge wind stream was conducted by experiment. The preferable VAWT position is where the higher wind velocity matches the positive torque area of the turbine rotation. With the proper matching among the VAWT configurations (blade number, airfoil type, operating tip-speed-ratio, etc.) and exhaust air profile, the turbine system was not only able to recover the wasted kinetic energy, it also reduced the fan motor power consumption by 4.5% and increased the cooling tower intake air flow-rate by 11%. The VAWT had a free running rotational speed of 479 rpm, power coefficient of 10.6%, and tip-speed-ratio of 1.88. The double multiple stream tube theory was used to explain the VAWT behavior in the non-uniform wind stream. For the actual size of a cooling tower with a 2.4 m outlet diameter and powered by a 7.5 kW fan motor, it was estimated that a system with two VAWTs (side-by-side) can generate 1 kW of power which is equivalent to 13% of energy recovery. OPEN ACCESSEnergies 2015, 8 6567

show abstract

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

Cited by 285 publications

References 12 publications

Optimization of the Power Output of a Bare Wind Turbine by the Use of a Plain Conical Diffuser

Optimization of the Power Output of a Bare Wind Turbine by the Use of a Plain Conical Diffuser

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator

Contact Info

Product

Resources

About