Search for dissertations about: "outlet"

Showing result 1 - 5 of 177 swedish dissertations containing the word outlet.

  1. 1. Turbine Outlet Guide Vane Flows

    Author : Johan Hjärne; Chalmers University of Technology; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Spalart-Allmaras model; k-ω SST model; linear cascade; secondary flows; turbine exhaust casing; RSM; k-ε realizable model; turbine rear frame; engine mount bump; tail bearing housing; Outlet guide vane;

    Abstract : New design goals on modern jet engines often leads to more highly loaded turbines with fewer stages in order to save weight and cost. This gives higher swirl angles into the outlet guide vane (OGV), implying a more difficult aerodynamic design. READ MORE

  2. 2. Air-pocket transport in conjunction with bottom-outlet conduits for dams

    Author : Ting Liu; Anders Wörman; James Yang; Staffan Lundström; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; Air-water two-phase flow; critical velocity; diameter effect; roughness; VOF model; bottom outlet; experiment;

    Abstract : Undesired air entrainment in bottom outlet conduits of dams may cause pressure transients, leading to conduit vibrations, blowback, discharge pulsation and even cavitation, and jeopardize the operational safety. Due to design limitations or construction costs, it is impossible to create an air free environment in a pressurized pipe. READ MORE

  3. 3. On investigations of patients with lower urinary tract symptoms due to suspected bladder outlet obstruction

    Author : Tomas Knutson; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; LUTS; BPH; bladder outlet obstruction; overactive bladder; pressure flow studies; PGA-stents;

    Abstract : Lower urinary tract symptoms (LUTS) are caused by a variety of different diseases, including cancer in the urinary tract, overactive bladder (OB) and bladder outlet obstruction (BOO). In order to find the most plausible cause of the patientís LUTS, a number of different investigations have been developed. READ MORE

  4. 4. Modelling calving and sliding of Svalbard outlet glaciers : Spatio-temporal changes and interactions

    Author : Dorothée Vallot; Rickard Pettersson; Veijo Pohjola; Ken Mattsson; Tómas Jóhannesson; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; cryospheric science; glacier modelling; time-lapse imagery; undercutting; sliding inversion; discrete particle model; calving model; subglacial hydrology; sliding law; automatic detection method; calving events size and frequency; ocean interaction; melt water runoff; ice dynamics; ice flow model; Geovetenskap med inriktning mot naturgeografi; Earth Science with specialization in Physical Geography;

    Abstract : Future sea level rise associated to global warming is one of the greatest societal and environmental challenges of tomorrow. A large part of the contribution comes from glaciers and ice sheets discharging ice and meltwater into the ocean and the recent worldwide increase is worrying. READ MORE

  5. 5. Modelling air―water flows in bottom outlets of dams

    Author : Ting Liu; James Yang; Anders Wörman; Michael Pfister; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Air pocket; Air entrainment; Bottom outlet; Critical velocity; Critical submergence; CFD; Experiment; Vortex; PIV; Two-phase air―water flow; Mark- och vattenteknik; Land and Water Resources Engineering; Civil and Architectural Engineering; Byggvetenskap;

    Abstract : If air is entrained in a bottom outlet of a dam in an uncontrolled way, the resulting air pockets may cause problems such as blowback, blowout and loss of discharge capacity. In order to provide guidance for bottom outlet design and operation, this study examines how governing parameters affect air entrainment, air-pocket transport and de-aeration and the surrounding flow structure in pipe flows. READ MORE