The Sequential Spark Technique: A Tool for Wake Velocity Studies in Ballistic Ranges
DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC)
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For more than six years, the Defence Research Establishment Valcartier DREV has been carrying out a program of investigation of turbulent wakes in its ballistic range facilities. One of the experimental techniques used in the program has been the sequential spark technique which makes use of electrical discharges sparks in sequence to measure velocity profiles in the wake of projecticles in free flight. This experimental technique is based on the formation of an ionized luminous path in the wake by a first spark and on the periodic reillumination of the displaced ionized path by successive sparks. Open-shutter photography yields a profile of the displacement of the path which can be used to calculate the velocity. The report presents a comprehensive review of the sequential spark technique.
- Test Facilities, Equipment and Methods
- Fluid Mechanics