Computational and Experimental Investigation of Runner for Gravitational Water Vortex Power Plant

Dhakal, Rabin; Khanal, Kshitiz

doi:10.31219/osf.io/4r5cj

Cited by 19 publications

(22 citation statements)

References 12 publications

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“…Dhakal et al [46] conducted an experimental and computational investigation of a runner for a GWVHT using a conical basin. This study focused on optimizing the runner to improve system efficiency.…”

Section: Numerical and Experimental Studiesmentioning

confidence: 99%

Untitled

2021

JESTR

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The availability of energy has been essential for humanity, which increasingly demands more energy resources to cover its consumption and well-being. Due to the rapid depletion of fossil fuels and climate change, use of alternative energy sources such as non-conventional renewable energy sources is fundamental. Within non-conventional renewable energy sources, small-scale hydroelectric power is an excellent option in the generation of clean energy. Its development has a long useful life with more than 100 years and still with possibilities for new designs and technological adaptations. Among these new designs are the gravitational water vortex hydraulic turbines (GWVHTs). A GWVHT is a run-of-river (ROR) hydropower system that harnesses the kinetic and potential energy of an induced vortex. Its main advantage is the ability to generate energy in low ranges of head and flow. The GWVHT is a new turbine with an efficiency between 17 and 85%, which still needs more research to optimize the geometry of the basin, inlet channel, and runner. This work presents a comprehensive analysis of various aspects of GWVHT such as modeling, optimum sizing, performance, and challenges to establish a starting point for further research. Until now, the studies have proved that the conical basins are better than the cylindrical basins, but they do not identify the dimensions of the geometry. With respect to the runner, the shape or number of blades has been varied, but the investigations show contradictory results.

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Section: Numerical and Experimental Studiesmentioning

confidence: 99%

Untitled

2021

JESTR

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“…R.Dhakal and colleagues did their research on "Computational and Experimental Investigation of Runner for Gravitational Water Vortex Power Plant" and came to conclusion that curved blade profile is the most efficient profile, with a peak efficiency of 82%, compared to 46% for the straight blade runner [3]. Research on "Comparison of cylindrical and conical basins with optimum position of runner: Gravitational water vortex power plant" by Sagar Dhakal and colleagues concludes that output power and efficiency is maximum in conical basin compared to that of cylindrical basin for all similar inlet and outlet condition [4].…”

Section: Study Of Past Researchmentioning

confidence: 99%

CFD evaluation of performance of Gravitational Water Vortex Turbine at different runner positions

Kayastha¹,

Raut²,

Subedi³

et al. 2020

Preprint

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A free vortex is a region in which flow revolves around an axis line that requires a small head to form, about 0.7 m-2 m. In Gravitational water vortex turbine, water assuming to be non-rotational and inviscid passes through an open channel and enters the basin tangentially where it forms a powerful vortex. Then, the dynamic force of water is transmitted by the vortex to the turbine via mixed flow, impulse and reaction, phenomena. It can be a promising cheap and effective solution to compliment recent strives for renewable energy technologies. This paper deals with design and development of a prototype Gravitational water vortex turbine and analysis with computational and experimental methods. Initially, the computational method focuses on determining maximum tangential velocity of water achievable in the setup without turbine. And further computational analysis is carried out for the setup with turbine to determine performance characteristics by adjusting the runner heights in three positions. This computational study is validated by performing experimental testing by fabricating test rig. It showed best efficiency when runner was at lowermost portion of the conical basin.

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“…The wind power density describes the wind resource available at a site, i.e., the capacity of a specific site for the wind energy production. It can be calculated using the relation [6]: Months from Jan to dec (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) where P is the wind power per unit area (A). Equation 9 can also be expressed as follows [10]:…”

Section: Wind Power Densitymentioning

confidence: 99%

Feasibility study of distributed wind energy generation in Jumla Nepal

Dhakal

Yadav

Koirala

et al. 2020

Preprint

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Renewable energy production needs serious attention in highly traditional, inefficient, and energy-dependent countries like Nepal. Moreover, the option of an effective renewable energy technology that is economically feasible and environmentally acceptable is a topic of interest due to the availability of various types of renewable energy sources in Nepal. Among other renewable energy sources like micro hydro, solar, biogas etc, very few studies had been conducted on wind energy sources in Nepal and those few studies also focuses mostly on large scale wind farming. So, this study analyzes the suitability of distributed wind energy production in Tila village of Jumla district in the western part of Nepal. Five-year (2015-2019) wind speed data were examined to obtain wind power density and energy density. Two-parameter Weibull probability density function was used to evaluate these two quantities. The annual Weibull parameters k and c of 1.73 and 4.21 m/s were obtained to calculate 43.79 W/m2 power density and 378.37 kWh/m2 energy density. This study also provides the economic evaluation of a 100 kW distributed wind energy system, and the technical and economic aspects of the proposed system are compared with the corresponding characteristics of the existing renewable energy systems, i.e., micro hydropower and solar power. The study shows that when there is not enough sunlight for the solar PV system and not enough water flow coupled with maintenance problems in the micro hydropower system, the distributed wind energy system may function as a substitute system.

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Computational and Experimental Investigation of Runner for Gravitational Water Vortex Power Plant

Cited by 19 publications

References 12 publications

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CFD evaluation of performance of Gravitational Water Vortex Turbine at different runner positions

Feasibility study of distributed wind energy generation in Jumla Nepal

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