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Article
Analysis of vorticity dynamics for hump characteristics of a pump turbine model
Conventional parameters based on CFD methodology for the investigation on hump characteristics of a pump turbine cannot reflect the dynamic interaction mechanism between the runner and the fluid. This research...
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Article
Entropy production analysis for hump characteristics of a pump turbine model
The hump characteristic is one of the main problems for the stable operation of pump turbines in pump mode. However, traditional methods cannot reflect directly the energy dissipation in the hump region. In th...
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Article
Numerical predictions and stability analysis of cavitating draft tube vortices at high head in a model Francis turbine
Draft tube vortex is one of the main causes of hydraulic instability in hydraulic reaction turbines, in particular Francis turbines. A method of cavitation calculations was proposed to predict the pressure flu...
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Article
Pressure fluctuation propagation of a pump turbine at pump mode under low head condition
Pressure fluctuation at the vaneless space and vanes passages is one of the most important problems for the stable operation of a pump turbine. The fluctuation appears in any operating condition. Much research...
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Article
Numerical investigation on the “S” characteristics of a reduced pump turbine model
The performance of a reversible pump turbine with S-shaped characteristics is of great importance to the transition processes such as start-up and load rejection. In order to predict the S-shaped curve accurat...
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Article
Performance prediction and flow analysis in the vaned distributor of a pump turbine under low flow rate in pump mode
The main goal of this work is to investigate the possible different flow patterns existing in pump turbine under off-design conditions in pump mode. Numerical simulations by solving the Navier-Stokes equation,...
