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Proceedings Paper

High-Frequency Spark Tracing And Application In Engineering And Aerodynamics
Author(s): F. Frungel
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Paper Abstract

In studying gas flow, the physical motion of the medium, is normally made visible by blowing in smoke or lightweight particles. These methods are limited to the observation of more complicated phenomena like turbulence, boundary layer flow or three-dimensional flow. In spark tracing, the luminous ionized plasma channel of an electric spark discharge is the indicator. This offers the particular advantage that it is comparatively mass-free, because the luminous ions of a gas discharge consist of the material of the flowing medium. This method has special advantages with three-dimensional or nonstationary flows, as well as processes of air mixtures in classifiers. The first discharge generates a spark path between two points of wires. If high voltage pulses are now fed to the same electrodes at such high repetition rates that during the interval between two pulses the plasma of the spark has not yet completely deionized, then every subsequent voltage pulse will trace the path of the first spark, which in the meantime has been moved away by the air current.

Paper Details

Date Published: 14 September 1977
PDF: 11 pages
Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); doi: 10.1117/12.955235
Show Author Affiliations
F. Frungel, Impulsphysik GmbH (Germany)

Published in SPIE Proceedings Vol. 0097:
12th Intl Congress on High Speed Photography
Martin C. Richardson, Editor(s)

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