Sökning: "Flood discharge tunnel"

Hittade 4 uppsatser innehållade orden Flood discharge tunnel.

  1. 1. Numerical Study on Air Demand of Free Surface Flows in a Discharge Tunnel

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Jonathan Barassa; Rickard Nordlöf; [2020]
    Nyckelord :Computational Fluid mechanics; Hydropower; Air demand; Free surface flows; ANSYS Fluent;

    Sammanfattning : Aeration issued through a ventilation shaft is an important measure to prevent cavitation and large gauge pressure in flood discharge tunnels. In order to dimension the ventilation shaft appropriately, itis necessary to have a good understanding of the air-water flow in the tunnel. LÄS MER

  3. 2. Aeration and risk mitigation for flood discharge tunnel in Zipingpu water conservancy project

    Master-uppsats, KTH/Betongbyggnad

    Författare :Jorge CONTRERAS MORENO; KIBRET DAWIT GHEBREIGZIABHER; [2020]
    Nyckelord :Flood discharge tunnel; cavitation risk; cavitation index; aerators; CFD model;

    Sammanfattning : The importance of hydraulic structures has become an essential mitigating mean for floodsthat occur more often due to climate change. Thus, the importance and safety of flooddischarge tunnels has promoted further studies and experiments on the topic to mitigatedamages, such as cavitation that arise because of high speed flows. LÄS MER

  4. 3. Numerical Study on Hydrodynamic Characteristics of Flood Discharge Tunnel in Zipingpu Water Conservancy Project : Using RANS equations and the VOF model

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

    Författare :Micaela Hamberg; Signe Dahlin; [2019]
    Nyckelord :VOF; RANS; Navier-Stokes; Spillway; Discharge tunnel; ANSYS; Fluent; CFD; Grid convergence index; Design of spillway; Cavitation; Gambit; k-epsilon; Ansys Gambit;

    Sammanfattning : To avoid the large amount of damage that floods can cause, spillway tunnels are used to control water levels. To ensure the safety of water transportation through spillway tunnels, the behaviour of the water throughout the tunnel is important to know. LÄS MER

  5. 4. Cavitation assessment of the Baihetan discharge tunnel – Using Computational Fluid Dynamics

    Master-uppsats, KTH/Vattendragsteknik

    Författare :Carin Alderman; Sophia Andersson; [2012]
    Nyckelord :Computational Fluid Dynamics CFD ; Discharge tunnel; Cavitation; Open channel flow; Static pressure; Baihetan hydropower project;

    Sammanfattning : Recently it has become more common in the construction of large dams to reuse diversion tunnels as flood discharge tunnels in the final structure. These tunnels handle large flows with the characteristics of open channel flow. When such large hydrological forces act upon a structure there are several problems to be expected. LÄS MER