Home – Home – Jornals – Thermophysics and Aeromechanics 2002 number 1

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.