A Study of Transient Flow Modes in a Hydraulic Turbine Draft Tube Model


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Resumo

Results are presented of experiments carried out using an air model of a hydraulic turbine draft tube. These included velocity measurements in the conical part of the tube using a laser-Doppler anemometer and measurement of pressure pulsations using acoustic sensors (microphones). It is shown that a system of two runner vane cascades can be used to simulate a velocity distribution that resembles the distributions downstream of a runner under full-scale conditions. Experiments show that modes involving the formation of a vortex rope occur in the region of significant hydroelectric generating unit underload. Analysis of spectra, the cross-correlation function, and mean velocity distributions confirmed the vortex nature of the generation of powerful pressure pulsations in the draft tube cone.

Sobre autores

I. Litvinov

Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk State University

Autor responsável pela correspondência
Email: litvinov@itp.nsc.ru
Rússia, Novosibirsk

A. Mitryakov

Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk State University

Email: litvinov@itp.nsc.ru
Rússia, Novosibirsk

S. Shtork

Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk State University

Email: litvinov@itp.nsc.ru
Rússia, Novosibirsk

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