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Title: Experimental analysis on the effects of DC arc discharges at various flow regimes

This paper addresses the control of the boundary layer on a compression ramp by means of DC electrical arc discharges. The development and realization of the control system are first described and then assessed in the wind tunnel. The objective of the research was to control the supersonic flow using the minimum amount of energy. The array of electrodes was located at the base of a ramp, where a low momentum flow develops. The electrical discharge was generated by a custom designed electronic facility based on high-voltage ignition coils. The slanted tungsten electrodes were insulated by mounting them in a ceramic support. The discharge evolution was studied through high-speed flow visualizations, while electrical measurements at the high-voltage section of the circuitry allowed to estimate the energy release. The development of a high-speed short exposure Schlieren imaging technique, based on a very short duration laser pulse illumination and a double shot CCD camera, allowed to observe the macroscopic effects associated with the arc establishment between the electrodes (glow, sound wave and heat release). Due to the long residence time, the thermal perturbation spread along the streamwise direction. Cross correlation of Schlieren images with short time separation revealed that in supersonic conditions,more » the discharges led to an overall acceleration of the flow field underneath the oblique shock wave.« less
Authors:
 [1] ; ;  [2] ;  [3]
  1. University of L’Aquila, L’Aquila 67100 (Italy)
  2. von Karman Institute for Fluid Dynamics, Rhode Saint Genèse B-1640 (Belgium)
  3. Purdue University, West-Lafayette, Indiana 47907 (United States)
Publication Date:
OSTI Identifier:
22403220
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Fluids (1994); Journal Volume: 27; Journal Issue: 3; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BOUNDARY LAYERS; CAMERAS; CHARGE-COUPLED DEVICES; COMPRESSION; CONTROL SYSTEMS; DISTURBANCES; ELECTRIC DISCHARGES; ELECTRIC POTENTIAL; ELECTRODES; EXPERIMENTAL DATA; FLOW VISUALIZATION; HEAT; LASER RADIATION; PULSED IRRADIATION; SHOCK WAVES; SOUND WAVES; SUPERSONIC FLOW; TUNGSTEN; WIND TUNNELS