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Thermophysics and Aeromechanics

2002 year, number 1

Application of a multi-channelled high-voltage pulse generator to visualization and measurement of gas-flow velocity

Yu.V. Afonin, A.P. Petrov, and D.G. Nalivaichenko
Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 137-143


A multi-channeled high-voltage pulse generator is designed intended for spark-discharge visualization and measurement of gas flow velocity in wind tunnel facilities. The conditions for spark-discharge ignition both in a uniform and sharply non-uniform velocity field are established. A two-pulsed spark-discharge ignition regime is realized, which allows to enlarge the controlled gas-flow zone by a factor of 2   3. The minimum amplitude of a voltage pulse for obtaining a second spark discharge and the maximum time interval appropriate for tracing the initial spark are determined. A description of practical implementation of the spark-tracing method in a supersonic gas jet is given. Results of direct flow-velocity measurements in a short-duration wind tunnel facility are reported.