Visualization Method For Volume Void Fraction
Measurements In Gas–liquid Two-phase Flows Of
A Water Turbine Outlet Channel
Author(s)
R. Klasinc, M. Hočevar, T. Baicar & B. Širok
Abstract
The Pelton turbines are the part of the pump-storage scheme that is working
under permanent backpressure conditions. The knowledge of air-absorbing and
degassing in the vessel which follows the turbine chamber is important for the
safe and economical working of the turbine. In the case of so called hydraulic
short circuit the influence of air bubbles for the safe operation of turbines and
pumps is very important. To estimate the volume void fraction in two-phase
flow, the measurement method was developed, which is based on the computeraided
visualization. Acquisition of flow images by a fast video camera followed
by the computer processing of the acquired images enables the determination of
the void fraction via the average value of grey level intensity of the acquired
flow images. A relationship between the void fracture and the average grey level
intensity was obtained through calibration of the measurement system.
Simultaneous measurements with the other measurement method revealed
suitability and applicability of the visualization method in a real industrial
environment such as a tailwater channel of a Pelton turbine. Apart from that, a
study revealed that by further processing the images a number of other important
information on the flow, such as bubble size and shape, average bubble direction
and velocity, can be obtained by the described method.
Keywords: air-water two-phase flow, computer-aided visualization, tailwater
channel.
Keywords
air-water two-phase flow, computer-aided visualization, tailwater
channel.
Related Book
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