Experimental Measurements For The Control Of
A Vortex Shaft Theoretical Model
Author(s)
G. Ciaravino, L. Ciaravino & G. Pulci Doria
Abstract
With reference to the hydrodynamic working of a dropshaft fitted with a vortex
inlet, there are still two problems that are open to debate: the actual distribution
of velocities at the inlet and the pressure distribution along the radius in the first
cross section of the shaft. The majority of researchers assume that the velocity
distribution is both irrotational and axially symmetrical, although some forty
years ago Viparelli experimentally showed that such an assumption is actually
incorrect, hypothesizing that the flow is symmetrical but not irrotational.
Moreover, the determination of pressure distribution in the different proposed
theories remains a debatable issue, with some claiming that the distribution of
pressure is equal to zero while others maintain it is positive. In the present paper,
two series of experimental measurements concerning the above-mentioned
problems are analyzed. A first series of experimental tests performed with a
Laser Doppler Anemometer confirms a different velocity distribution hypothesis:
irrotational but not entirely symmetrical. A second series of experimental tests
deals with pressure measurements made in the vertical shaft inlet. Contrary to
what has been hypothesized by other researchers, these measurements indicate
negative pressure values.
Keywords: dropshaft, vortex flow, mathematical model, experimental
measurements, Laser-Doppler Anemometer.
1 Introduction
Inflow in a dropshaft with vortex inlet is a rather complex phenomenon which
still presents certain issues that have not been fully clarified. In spite of this such
device is of great interest because of its undeniable technical importance. Its
Keywords
dropshaft, vortex flow, mathematical model, experimental
measurements, Laser-Doppler Anemometer.
Related Book
Other papers in this volume
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