Development of High-Performance Wind Turbine with Brimmed Diffuser

Ohya, Yuji; Karasudani, Takashi; Sakurai, Akira

doi:10.2322/jjsass.50.477

Cited by 21 publications

(23 citation statements)

References 3 publications

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“…The smoke-wire technique was employed for the flow visualization experiment. The experiments revealed that a diffuser-shaped structure can accelerate the wind at the entrance of the body, as shown in Figure 2 [8][9][10]. The reason is clarified through the flow visualization, as shown in Figure 3.…”

Section: Selection Of a Diffuser-type Structure As The Basic Formmentioning

confidence: 87%

“…The inlet shroud makes wind easy to flow into the diffuser. 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].…”

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

confidence: 99%

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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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Section: Selection Of a Diffuser-type Structure As The Basic Formmentioning

confidence: 87%

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

Self Cite

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“…It can be seen that the static pressure increases near the inlet of type A and hinders the flow from entering the collection device. On the other hand, the static pressure near the inlet of type B decreases and the flow is easily drawn into the collection device [8]. However, in type B, backflow is created inside the collection device.…”

Section: Performance Characteristics For the Collection Device Onmentioning

confidence: 99%

“…Open and shallow water channels are constrained in the height direction. Accordingly, the type described here 2 International Journal of Rotating Machinery differs from conventional wind turbines [7][8][9][10][11] and hydraulic turbines [12][13][14][15] in which the diffuser section of the collection device is constant vertically and varies horizontally. Thus, the outer diameter of the runner is almost as large as the water depth.…”

Section: Introductionmentioning

confidence: 99%

Study on an Axial Flow Hydraulic Turbine with Collection Device

Nishi

Inagaki

Okubo

et al. 2014

International Journal of Rotating Machinery

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We propose a new type of portable hydraulic turbine that uses the kinetic energy of flow in open channels. The turbine comprises a runner with an appended collection device that includes a diffuser section in an attempt to improve the output by catching and accelerating the flow. With such turbines, the performance of the collection device, and a composite body comprising the runner and collection device were studied using numerical analysis. Among four stand-alone collection devices, the inlet velocity ratio was most improved by the collection device featuring an inlet nozzle and brim. The inlet velocity ratio of the composite body was significantly lower than that of the stand-alone collection device, owing to the resistance of the runner itself, the decreased diffuser pressure recovery coefficient, and the increased backpressure coefficient. However, at the maximum output tip speed ratio, the inlet velocity ratio and the loading coefficient were approximately 31% and 22% higher, respectively, for the composite body than for the isolated runner. In particular, the input power coefficient significantly increased (by approximately 2.76 times) owing to the increase in the inlet velocity ratio. Verification tests were also conducted in a real canal to establish the actual effectiveness of the turbine.

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“…Open channels with shallow water depth are constrained in the height direction. Accordingly, the hydraulic turbine described here differs from conventional wind turbines [8,[12][13][14] and hydraulic turbines [15][16][17][18] in which the diffuser section of the collection device is constant vertically and varies horizontally. The brim was attached to the left and right sides of the outlet of the collection device.…”

Section: Hydraulic Turbine Test Piecementioning

confidence: 99%

Study on Performance Improvement of an Axial Flow Hydraulic Turbine with a Collection Device

Nishi¹,

Inagaki²,

Li³

et al. 2016

International Journal of Fluid Machinery and Systems

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The portable hydraulic turbine we previously developed for open channels comprises an axial flow runner with an appended collection device and a diffuser section. The output power of this hydraulic turbine was improved by catching and accelerating an open-channel water flow using the kinetic energy of the water. This study aimed to further improve the performance of the hydraulic turbine. Using numerical analysis, we examined the performances and flow fields of a single runner and a composite body consisting of the runner and collection device by varying the airfoil and number of blades. Consequently, the maximum values of input power coefficient of the Runner D composite body with two blades (which adopts the MEL031 airfoil and alters the blade angle) are equivalent to those of the composite body with two blades (MEL021 airfoil). We found that the Runner D composite body has the highest turbine efficiency and thus the largest power coefficient. Furthermore, the performance of the Runner D composite body calculated from the numerical analysis was verified experimentally in an open-channel water flow test.

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Development of High-Performance Wind Turbine with Brimmed Diffuser

Cited by 21 publications

References 3 publications

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

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

Study on an Axial Flow Hydraulic Turbine with Collection Device

Study on Performance Improvement of an Axial Flow Hydraulic Turbine with a Collection Device

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