Controlling Flow in Draft Tube of Francis Turbine by Vortex Preventing Element
نویسندگان
چکیده
منابع مشابه
Interaction of a pulsating vortex rope with the local velocity field in a Francis turbine draft tube
Acoustic resonances in Francis turbines often define undesirable limitations to their operating ranges at high load. The knowledge of the mechanisms governing the onset and the sustenance of these instabilities in the swirling flow leaving the runner is essential for the development of a reliable hydroacoustic model for the prediction of system stability. The present work seeks to study experim...
متن کاملDetecting Nonlinearity in Pressure Data inside the Draft Tube of a Real Francis Turbine
A general method for testing nonlinearity in time series is described and applied to measurements of different pressure data inside the draft tube surge of a real Francis turbine. Comparing the current original time series to an ensemble of surrogates time series, suitably constructed to mimic the linear properties of the original one, we was able to distinguish a linear stochastic from a nonli...
متن کاملNumerical Study of a Pipe Extension Effect in Draft Tube on Hydraulic Turbine Performance
Draft tube of Francis type hydraulic turbine usually consists of: cone, elbow and diffuser. On the contrary, in some power stations an extra pipe should be added to the draft tube at the bottom of cone because of installation limitation. In this paper, this special case has been numerically studied. To this end CFD analysis was applied to simulate all parts of hydraulic turbine. A homogeneous m...
متن کاملDetermination of Hydroacoustic Draft Tube Parameters by High Speed Visualization during Model Testing of a Francis Turbine
Francis turbines can experience critical instabilities at high load operating points, limiting their maximum power output. The swirling flow developed in the draft tube produces a cavitating axisymmetric volume, acting as an internal energy source leading to a self-excited surge phenomenon. The pulsation of the vortex rope corresponds to one of the eigenfrequencies of the hydraulic system. Effo...
متن کاملNumerical simulation of a cavitating draft tube vortex rope in a Francis turbine at part load conditions for different σ-levels
In the present study, numerical investigations of a Francis turbine at model scale are performed. A part load operating point is selected for the analysis with a focus on the cavitating draft tube vortex rope. For three σ-levels, different aspects are investigated. First, the extension of the vapor volume is analyzed and compared to high-speed visualization recordings from the measurements. Fur...
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ژورنال
عنوان ژورنال: Journal of electrical power & energy systems
سال: 2022
ISSN: ['2576-0521', '2576-053X']
DOI: https://doi.org/10.26855/jepes.2022.02.001