Optimal design of axial hydro turbine for micro hydropower plants

Derakhshan, Shahram; Kasaeian, Nemat

doi:10.1088/1755-1315/15/4/042029

Cited by 9 publications

(6 citation statements)

References 6 publications

(8 reference statements)

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“…Fig. 6(b) also shows that the larger nozzle diameters enhanced higher turbine speeds primarily due to the fact that they delivered higher flow rates in line with basic mechanics of fluids [62,77].…”

Section: Resultsmentioning

confidence: 68%

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Influence of Number of Flat Locally-Fabricated Turbine Blades on the Performance of a Simplified Pico Hydropower System

Edeoja¹,

Aboje²,

Lawal³

et al. 2022

JENRR

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Five locally fabricated turbines with 3, 5, 7, 9 and 11 flat blades were locally fabricated and tested in conjunction with a vertical penstock of diameter 0.0762 m and nozzles of diameters 0.0158, 0.0212, 0.0266, 0.0343 and 0.042 m in a simplified Pico hydropower system. This study is an aspect of an ongoing work aimed at ultimately implementing the system for small power generation. The turbines were mounted at the foot of an overhead reservoir 6.95 m high. A 1.11 kW pump was used to recycle the water downstream of the turbine from an underground reservoir to the overhead reservoir, and a 3.9 kVA alternator used for the on-load tests. The turbine was linked to a 3.9 kVA alternator by a belt drive of pulley ratio of 6:1. The mean rotational speeds of each turbine and alternator shafts, volume of water displaced, and voltage developed were measured for each nozzle diameter. These data were used to compute flow rate, shaft and electrical power, and efficiency for each operation. Dimensionless flow, head and power coefficients as well as specific speed were computed and functional characteristic curves relating plotted. The turbine with 11 blades developed the maximum voltage with the nozzle diameter of 0.042 m and the least voltage for 0.0158 m diameter nozzle. The corresponding estimated power output computed using the manufacturer’s specifications on the alternator was also highest and the mean maximum efficiency based on the estimated power output was 0.4482. This indicates that the larger nozzle diameters combined with the turbine with higher number of flat blades favour beneficial system operation. The results indicate good potential for the system as a simple, environmentally friendly and decentralized small power generation system that can contribute to the current energy mix in Nigeria.

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Section: Resultsmentioning

confidence: 68%

“…Specific speed is then neither dimensionless (specific) nor a speed. It is better regarded as a "shape factor" and it is its ability to describe the shape of a turbine design independently of turbine size [77].…”

Section: The Flow (mentioning

confidence: 99%

Influence of Number of Flat Locally-Fabricated Turbine Blades on the Performance of a Simplified Pico Hydropower System

Edeoja¹,

Aboje²,

Lawal³

et al. 2022

JENRR

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“…The servomotor to accomplish this is located in the hub in some designs [33] [34]. References [42] [43] [44] presented an axial hydro turbine with low heads micro potential flow ranged from 1 m to 5 m.…”

Section: Axial Flow Turbines "Propeller and Kaplan Turbines"mentioning

confidence: 99%

A Review on Micro Hydro Gravitational Vortex Power and Turbine Systems

et al. 2014

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Electrical power is essential in commercial and social investments like lighting, heating, communications, computers, industrial equipment, transport etc. Therefore hydropower energy is one of the most suitable and efficient source of renewable energy which depends on more than century of experience for this issue. The power capacity and facility are two criteria required for the classification of hydropower plant. The first one consists of five technologies: dammed reservoir, run of river, pumped storage, in stream technology and new technology gravitational vortex. The other one is classified according to power scale is Large, Small, Micro and Pico Hydropower. This paper is focusing on micro hydropower especially gravitational vortex power which increases the sustainability and health of the water as a whole. It presents an overview from both flow and power points of view by discussing the free surface vortex (FSV) and the suitable turbine systems which are used in micro hydropower.

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“…To improve the performance of the turbine, Yang [Yang (2011)] optimized the geometry of the blades. Sheng, Singh et al [Singh and Nestmann (2010)], Derakhshan et al [Derakhshan and Kasaeian (2012); Yang, Derakhshan and Kong] proposed that rounding the turbine blade inlet edge and trimming the outer edge of the shroud and hub can increase the turbine efficiency by 1% to 4%. The current results of numerical simulations remain to be improved because of the complexity and variety of the turbine's geometry structures.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Centrifugal Pump Used as a Turbine Impeller By Means of an Orthogonal Test Approach

Tian

Huang²,

Shi³

et al. 2019

Fluid Dynamics &Amp; Materials Processing

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A prototype centrifugal pump with a specific speed of 110 is used to investigate and optimize the performances of a turbine for power generation. Particular attention is given to the design of the internal impeller. The internal flow field is simulated in the framework of a commercial computational fluid dynamics software (ANSYS). Four geometrical parameters of the impeller are considered, i.e., the inlet diameter, the inlet width, the blade number, and the blade angle. The optimization is carried out on the basis of a three-level approach relying on an orthogonal test method. The results of the numerical simulations show good agreement with the experimental tests under different flow conditions. In accordance with the L9 (3 4) design table, the head and efficiency under the rated flow rate of the nine designed schemes are calculated and processed with the method of range analysis to obtain an optimized model.

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Optimal design of axial hydro turbine for micro hydropower plants

Cited by 9 publications

References 6 publications

Influence of Number of Flat Locally-Fabricated Turbine Blades on the Performance of a Simplified Pico Hydropower System

Influence of Number of Flat Locally-Fabricated Turbine Blades on the Performance of a Simplified Pico Hydropower System

A Review on Micro Hydro Gravitational Vortex Power and Turbine Systems

Optimization of a Centrifugal Pump Used as a Turbine Impeller By Means of an Orthogonal Test Approach

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