Development of Counter-Rotational Type Machine for Hydroelectric Power Generation. 2nd Report. Hydraulic Performance and Potential Interference of Counter-Rotating Runners.

敏明, 金元; 圭一, 富永; 大輔, 田中; 将, 佐藤; 俊規, 柏原; 美津夫, 宇野

doi:10.1299/kikaib.68.3416

Cited by 7 publications

(3 citation statements)

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“…Counter-rotating rotors have been the object of other studies; the performance of this kind of structure, the optimizing of blade solidity, and potential interference are discussed in these references [11][12][13]. The diameter of the contra-rotating, small hydro-turbine is only 60 mm, and this will make it difficult to manufacture the generator.…”

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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“…For these reasons, we adopted contra-rotating rotors, which could be expected to achieve high performance and enable to use low-solidity rotors with wide flow passage, in order to accomplish high performance and stable operation. Some basic issues of using these contra-rotating rotors have been discussed, including the characteristic performance of using contra-rotating rotors, potential interference and the optimum value of blade solidity [10][11][12]. However, it is hard to construct the contra-rotating generator by this small hydro-turbine of which diameter is only 60mm, this problem has to be considered.…”

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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“…The counter-rotating type machine for water power generation was first proposed by Kanemoto [2]. A lot on the concept followed afterwards [3][4][5]. The good thing about using this system is that the head and the flow rate are very stable.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a counter-rotating tubular type micro-turbine by experiment and CFD

Lee

Choi

Hwang³

et al. 2012

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Micro hydraulic turbines have a growing interest because of its small and simple structure, as well as a high possibility of using in micro and small hydropower applications. The differential pressure existing in city water pipelines can be used efficiently to generate electricity in a way similar to that of energy being generated through gravitational potential energy in dams. The pressure energy in the city pipelines is often wasted by using pressure reducing valves at the inlet of water cleaning centers. Instead of using the pressure reducing valves, a micro counter-rotating hydraulic turbine can be used to make use of the pressure energy. In the present paper, a counter-rotating tubular type micro-turbine is studied, with the front runner connected to the generator stator and the rear runner connected to the generator rotor. The performance of the turbine is investigated experimentally and numerically. A commercial ANSYS CFD code was used for numerical analysis.

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Development of Counter-Rotational Type Machine for Hydroelectric Power Generation. 2nd Report. Hydraulic Performance and Potential Interference of Counter-Rotating Runners.

Cited by 7 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

Performance analysis of a counter-rotating tubular type micro-turbine by experiment and CFD

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