Development of Gyro-Type Hydraulic Turbine Suitable for Shallow Stream (1st Report, Rotor Works and Hydroelectric Power Generation)

Kanemoto, Toshiaki; Inagaki, Akira; Misumi, Haruki; Kinoshita, Hiroaki

doi:10.1299/kikaib.70.413

Cited by 13 publications

(6 citation statements)

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“…For this kind of small power range, Darrieus and gyro-type turbines are suitable because they are designed for low-head working environments. Therefore, the performance and optimizing of Darrieus and gyro-type turbines are investigated [2,3]. Darrieus hydro-turbines are suitable for extra-low-head working environments such as small streams.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine

2018

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At present, there is strong impetus for renewable energy to replace the traditional energy sources because of the environmental pollution. Small hydropower is a promising renewable energy source; however, small hydro-turbines easily become blocked and impacted, and the efficiency of such devices is lower. Therefore, we examined contra-rotating rotors to overcome these disadvantages. We have made modifications to the blade thickness and to the front hub of the original model. In this paper, we focus on the attack angle and rear flow condition of the original model and the modified one. The axial and circumferential velocities are given as outputs, from which the attack angle is then calculated. The results show that the attack angle of new model is smaller at the hub area. The stagnation point of the rear rotor was moved slightly to the pressure surface of the rear blade, and the separation at leading edge area was suppressed. The crowed flow at the tip clearance area is also reduced. The high turbulent kinetic energy area is moved forward to the middle of the blade. The rear rotor's torque is bigger and changes more smoothly. Therefore, the rear flow conditions of the new model are improved.

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Section: Introductionmentioning

confidence: 99%

Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine

2018

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“…On one hand, there are a lot of places which can generate about 100W-1kW in agricultural water and a small stream, and installations of hydropower at these places are expected to be harmless to the environment. Therefore, darrieus and gyro-type turbines, which were suitable for design specifications of a low head in agricultural water and a small river, were investigated and the performance characteristics and the optimum design parameter were discussed [1][2]. There are also some extra-low head natural flow streams where the darrieus-type hydro-turbine can be utilized, and in order to avoid the obstacles flowing into the hydro-turbine, a waste screening system was designed and tested [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Contra-Rotating Small Hydro-Turbine with Cylinder Spoke

Ding

Shigemitsu

Zhao³

et al. 2018

IJFMS

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Small hydropower is one of potential energy resource existing in our living environment and yet not been widely used. Small hydro-turbine is suitable in these energy resources while it still has some shortages, like performing low efficiency and easy to be out of control when there are foreign materials in the water. Thus we designed this contrarotating small hydro-turbine to increase its efficiency and enhance its ability of keeping stable operation. The experimental apparatus was designed and assembled, and some experiments were conducted. A new kind of cylinder spoke, which supports the front and rear rotor, was adopted and the numerical analysis was carried out in this paper. As the numerical analysis results shown, the efficiency of test turbine with cylinder spoke increased in a wide range of flow rate. The maximum efficiency increased about 2.2%, reaching to 66.4%, and it was obtained at 1.25Qd. The internal flow condition, especially at the areas behind the spoke, was improved by the cylinder spoke.

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“…Small hydropower installations are expected to have lower environmental impacts. Therefore, Darrieus and gyro-type turbines, which were suitable for design specifications of low head in agricultural water and a small river, were investigated, and the performance characteristics and the optimum design parameter were discussed [1,2]. Internal flow of a spiral water turbine with wide flow passage, which had small environmental impact, was investigated [3].…”

Section: Introductionmentioning

confidence: 99%

Challenge to Use Small Hydropower by Contrarotating Small Hydro Turbine

Shigemitsu

Fukutomi

Tanaka

2015

Renewable Energy in the Service of Mankind Vol I

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Small hydropower generation is alternative energy, and there is a significant potential for a small hydro turbine. Small hydropower facilities that generate about 100-1000 kW have spread widely; however, it causes environmental destructions by a foundation construction and a set up of a draft tube. On the other hand, there are a lot of places that can generate about 100 W-1 kW (pico-hydropower) in agricultural water and a small stream. Efficiency of small hydro turbines is lower than that of large ones, and it can be used in wide flow rates range. Then, there are demands for small hydro turbines to keep high performance in wide flow rates range. Therefore, we adopted contra-rotating rotors, which could be expected to achieve high performance. In this study, a significant compact hydro turbine is named as a small hydro turbine. Final goal on this study is development of a small hydro turbine-like electrical goods, which has high portability and makes an effective use of the unused small hydropower energy resource.In this research, we selected some places in Tokushima Prefecture in Japan, where a small hydropower could be generated, and conducted field tests of head, flow rate and water quality. Then, it was found that it was necessary to develop a small hydro turbine that could generate electricity in wide flow rates range because the small hydropower potential was different at each place. Therefore, we designed and manufactured an experimental apparatus to clarify the performance of our proposed contra-rotating small hydro turbine and investigated flow condition at the inlet of each front and rear rotor by the numerical analysis. Furthermore, the circumferential velocity distributions downstream of the rear rotor were also clarified.

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Development of Gyro-Type Hydraulic Turbine Suitable for Shallow Stream (1st Report, Rotor Works and Hydroelectric Power Generation)

Cited by 13 publications

References 0 publications

Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine

Investigation and Analysis of Attack Angle and Rear Flow Condition of Contra-Rotating Small Hydro-Turbine

Numerical Analysis of Contra-Rotating Small Hydro-Turbine with Cylinder Spoke

Challenge to Use Small Hydropower by Contrarotating Small Hydro Turbine

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