Probe diagnostics of gas discharges in supersonic airflows

Autor:	I. Timofeev, N. V. Ardelyan, S. N. Chuvashev, V.M. Shibkov, A. P. Ershov
Rok vydání:	2001
Předmět:	Materials science business.industry Electrical engineering Aerospace Engineering High voltage Aerodynamics Plasma Computational physics symbols.namesake Mach number Physics::Plasma Physics symbols Plasma diagnostics Supersonic speed Electric potential business Choked flow
Zdroj:	AIAA Journal. 39:2180-2187
ISSN:	1533-385X 0001-1452
DOI:	10.2514/3.14983
Popis:	A new case of probe diagnostics of plasma density under the condition typical for plasma aerodynamic applications (high voltage and electric e eld, high nonequilibrium between components, high gas pressures, and a considerable compression effect ) has been examined. The experiments have been carried out in dc and pulsed periodic discharges in supersonic aire ows with Mach number M = 2 at the static ambient pressure range 10 ‐200 torr. A personal-computer controlled double probe with an optogalvanic isolation based on an optocoupler and a e ber optical waveguide have been developed and tested in the gas discharges. A new theory of probe diagnostics of plasmas with a very high electric e eld in a supersonic aire ow is developed based on a computer simulation of the interaction of the probe and the plasma e ow. A combined effect of the e ow compression and the electric e eld perturbation on the plasma density near the probe is revealed. This effect can limit the area of applicability of the probe diagnostics. Measures to prevent this negative effect are suggested. The results of probe diagnostics of the plasma density are in good agreement with those obtained using the microwave interferometer and the spectral method.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::902c3c431153125ef3a5df45e2b011a6 https://doi.org/10.2514/3.14983 Zobrazit plný text záznamu