Experimental investigation of the local wave speed in a draft tube with cavitation vortex rope
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...
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چکیده ندارد.
15 صفحه اولMethodology for Risk Assessment of Part Load Resonance in Francis Turbine Power Plant
At low flow rate operation, Francis turbines feature a cavitating vortex rope in the draft tube resulting from the swirling flow of the runner outlet. The unsteady pressure field related to the precession of the vortex rope induces plane wave propagating in the entire hydraulic system. The frequency of the vortex rope precession being comprised between 0.2 and 0.4 times the turbine rotational s...
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The low-frequency tube wave speed is given explicitly for a variety of borehole nvironments. The presence of a logging tool, the effects of casing, and bore eccentricity are considered. The results are all relatively simple and indicate that the speed ecreases in the presence of a tool or borehole ccentricity. The speed increases in the presence of casing as long as the casing shear modulus exc...
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ژورنال
عنوان ژورنال: IOP Conference Series: Earth and Environmental Science
سال: 2014
ISSN: 1755-1307,1755-1315
DOI: 10.1088/1755-1315/22/3/032037