Sökning: "Francis turbine"
Visar resultat 1 - 5 av 10 avhandlingar innehållade orden Francis turbine.
1. Numerical Investigations of Turbulent Flow in Water Turbines
Sammanfattning : This thesis investigates turbulent flow in water turbines, focusing onthe flow in the vicinity of reaction water turbine runners such as theKaplan runner and the Francis runner. The method of investigationis principally numerical although some experimental observations andmeasurements made in the present work and elsewhere are included. LÄS MER
2. FLOW FIELD IN A HIGH HEAD FRANCIS TURBINE DRAFT TUBE DURING TRANSIENT OPERATIONS
Sammanfattning : Hydroelectricity plays an important role to balance the stability of grid network. In order to improve the stability of presently high loaded grids, hydropower plants are being operated over a wide range of operations and experiencing frequent start-stop, load rejection, and load acceptance. LÄS MER
3. Mitigation of Pressure Pulsations in Francis Turbine Draft Tube with a GuideVane System : A Numerical Investigation
Sammanfattning : The use of renewable energy such as water and wind to produce electricity has been proven extremely effective in Sweden. The ability of these renewable resources to produce clean output energy counters the adversities caused by non-renewable resources. LÄS MER
4. Investigations of Transient Pressure Loading on a High Head Francis Turbine
Sammanfattning : This doctoral thesis includes six peer-reviewed publications. Beginning with an extensive literature review, this work discusses the study of turbine performance, investigations of the unsteady pressure loading during transient operations, and consequences at runaway speed. LÄS MER
5. Transients in high head Francis turbines
Sammanfattning : On demand energy market and favourable government policies to encourage the usage of renewable energy have led to a dramatic increase of grid connected wind, solar, and other power in recent years. Penetration of the power above manageable limit, produced using intermittent energy sources, to meet the demand has induced instable grid operations. LÄS MER