Sökning: "hydro"

Visar resultat 6 - 10 av 204 avhandlingar innehållade ordet hydro.

  1. 6. Low head pumped hydro storage with contra-rotating pump-turbines

    Författare :Jonathan Fahlbeck; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy storage; Pumped hydro storage; CFD; Transients; Pump-turbine; Low head; OpenFOAM; Contra-rotating; Hydropower;

    Sammanfattning : The increasing share of electrical energy production by intermittent sources pushes the demand for energy storage. Pumped hydro storage (PHS) has a long history of providing a cost-efficient energy storage solution. However, for PHS to be a viable option, a large head is typically required. LÄS MER

  3. 7. Numerical simulations of hydro power flows

    Författare :John Bergström; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : .... LÄS MER

  4. 8. Hydro-mechanical forming of aluminium tubes : on constitutive modelling and process design

    Författare :Mikael Jansson; Larsgunnar Nilsson; Odd Sture Hopperstad; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hydroforming; Aluminium Extrusions; Anisotropic material; Solid mechanics; Fastkroppsmekanik;

    Sammanfattning : Tube hydroforming is a forming method which has several advantages. By using pressure in combination with material feeding it is possible to manufacture products with high structural integration and tight dimensional tolerances. The forming method is especially suited for aluminium alloys which have a relatively low ductility. LÄS MER

  5. 9. Ventilation of a Model Hydro-Generator, An Experimental and Numerical Study

    Författare :Hamed Jamshidi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CFD; Ventilation; Hydro Power Generator; Experiment;

    Sammanfattning : Generators are sophisticated machines used to convert the mechanical energy of a prime mover into electrical energy. Electromagnetic and mechanical losses accompany this energy conversion process. Cooling systems remove the heat, generated by losses, from these machines. LÄS MER

  7. 10. Hydro-Mechanical Behaviour of a Pressurised Single Fracture: An In-situ Experiment

    Författare :Patrik Alm; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hydro-mechanical behaviour; hydraulic field test; transmissivity; effective stress; aperture; fracture stiffness; fracture; slug test;

    Sammanfattning : Exploration of ground water resources, grouting, disposal of nuclear waste and extraction of geothermal energy are examples of activities which require consideration of the relationship between effective stress and transmissivity. However, this relationship is poorly understood and very few investigations have been conducted in field scale. LÄS MER