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Low head hydropower for local energy solutions

Author: Arcot Ganesh Pradeep Narrain
Publisher: Leiden : CRC Press, 2017.
Edition/Format:   eBook : Document : EnglishView all editions and formats
Summary:
"The role of small hydropower is becoming increasingly important on a global level. Increasing energy demand and environmental awareness has further triggered research and development into sustainable low-cost technologies. In developing countries, particularly in rural areas, the possibility of local power generation could considerably improve living conditions. With this in mind, the development of a next  Read more...
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Genre/Form: Electronic books
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Arcot Ganesh Pradeep Narrain
ISBN: 9781351182706 1351182706 9781351182713 1351182714
OCLC Number: 1012219308
Notes: "Disseration submitted in fulfillment of the requirements of the Board of Doctorates of Delft University of Technology and of the Academic Board of the UNESCO-IHE Institute for Water Education for the Degree of Doctor to be defended in public on Monday 9, October 2017, at 10:00 hours in Delft, the Netherlands."
Description: 1 online resource
Contents: Cover; Half Title; Title; Copyright; Epigraph; Summary; Samenvatting; Contents; Nomenclature; Chapter 1 Introduction; 1.1 Energy demand; 1.2 Hydropower; 1.3 Low head hydropower â#x80;#x93; the HYLOW project; 1.4 Hydrostatic pressure machine; 1.5 Modelling approach; 1.6 General Objectives; 1.7 Research Questions; 1.8 Outline of the thesis; Chapter 2 The Water â#x80;#x93; Energy nexus; 2.1 Large Hydropower; 2.2 Small Hydropower; 2.3 Appropriate Technology; 2.4 Small scale power generation; 2.5 The HYLOW hydrostatic pressure converters; 2.6 Environmental issues; 2.7 Costs. Chapter 3 Hydropower takeâ#x80;#x93;off mechanics3.1 Hydraulic machines; 3.1.1 Turbines; 3.1.2 Waterwheels; 3.1.3 Other hydropower machines; 3.1.4 Power calculation; 3.2 The HYLOW project; 3.2.1 Project scope; 3.2.2 The hydrostatic pressure machine (HPM; 3.2.3 The free stream energy converter; 3.2.4 Micro-turbines in water pipeline networks; 3.3 Design considerations; 3.3.1 The power take-off mechanism; 3.3.2 Schematic set-up of power generation; Chapter 4 Computational Fluid Dynamics; 4.1 Governing equations; 4.1.1 Conservation principles; 4.1.2 Reynolds Averaged Navier Stokes equations (RANS. 4.1.3 Turbulence closure4.1.4 Discretisation methods for numerical simulation; 4.1.5 Discretization in space and time; 4.2 Free surfaces, volume of fluid (VoF) approach; 4.2.1 Multiphysics approach to free surface flows; 4.2.2 Surface tracking; 4.2.3 Volume tracking methods; Chapter 5 Application of 2D CFD modelling; 5.1 2D Setup: Preprocessing; 5.1.1 Domain; 5.1.2 Mesh; 5.1.3 General settings; 5.1.4 2D Cases; 5.1.5 Postprocessing; 5.2 2D Analysis; 5.2.1 Case 1; 5.2.2 Case 2; 5.2.3 Case 3; 5.2.4 Case 4; 5.3 Comparison of results; 5.4 Discussion: 2D case. Chapter 6 Application of 3D CFD modelling6.1 3D Setup: Preprocessing; 6.1.1 Domain; 6.1.3 General settings; 6.1.2 Mesh; 6.1.4 3D Cases; 6.2 3D Analysis; 6.2.1 Case 1; 6.2.2 Case 2; 6.2.3 Model with wall gap; 6.2.4 Full model with straight blades; 6.2.5 Full model with blade slope; 6.2.6 Case 3; 6.3 Comparison of results; 6.4 Case 4; 6.4.1 Influence of channel dimensions on machine performance; 6.4.2 Influence of triangular obstructions; 6.4.3 Effects of change in the channel bed slope; 6.4.4 Effect of wall gaps; 6.4.5 Effect of downstream channel dimensions; 6.5 Discussion: 3D case. Chapter 7 Discussion7.1 Small hydropower machines; 7.1.1 Numerical and experimental investigations; 7.1.2 Conversion efficiencies; 7.1.3 Full scale model experiments; 7.2 Other HYLOW project findings; 7.2.1 Environmental considerations; 7.2.2 Free stream energy converter; 7.2.3 Micro-turbines in water pipe networks; 7.3 Small hydropower in a global context; 7.3.1 The European perspective; 7.3.2 The global perspective; Chapter 8 Conclusions and recommendations; 8.1 Research Answers; 8.2 Recommendations; References; Acknowledgements.
Responsibility: by Arcot Ganesh Pradeep Narrain.

Abstract:

"The role of small hydropower is becoming increasingly important on a global level. Increasing energy demand and environmental awareness has further triggered research and development into sustainable low-cost technologies. In developing countries, particularly in rural areas, the possibility of local power generation could considerably improve living conditions. With this in mind, the development of a next generation low-head hydropower machines was subject of investigation in the EU-project HYLOW. Being part of the research lines of that project, this thesis presents a numerical modelling approach to improve the design of machines like water wheels for increased hydraulic efficiency. Nowadays, Computational Fluid Dynamics (CFD) enables numerical models to be quite accurate and incorporate physical complexities like free surfaces and rotating machines. The results of the CFD simulations carried out in this research show that a change in blade geometry can result in higher torque levels, thereby increasing performance. Numerical simulations also enabled to determine the optimal wheel-width to channel-width ratio and further improve performance by modifying the channel bed conditions upstream and downstream of the water wheel. With a power rating in the low kilowatt range, low-head hydropower machines like optimised water wheels seem to have a clear potential for small-scale energy generation, thereby contributing to achieving the Sustainable Development Goals by providing local energy solutions."--Provided by publisher.

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