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Title: ON ANODE GAS-SHEATH ELECTRICAL BREAKDOWN IN A HIGH-PRESSURE-ARC PLASMA GENERATOR. Research Report

Abstract

An experimental investigation into the mechanisms of electrical conduction across the low-temperature gas layer covering the cooled anode of a high-pressure nitrogen arc plasma generator is reported. Various flow regimes were identified; the turbulent mode was studied particularly. The cool wall gas sheath is shown to be bridged electrically by a moving concentrated arc. This arc behavior led to a cyclic variation of the potential difference between cathode and anode, but the arc current remained constant. Re-ignition of the arc after each cycle of travel down the nozzle-anode occurred by breakdown of the electrode gap in the neighborhood of the cathode. This breakdowm occurred at abnormally low voltage differences; the evidence indicated that the breakdown is strongly affected by the aerodynamic characteristics of the flow around the cathode. Reduced data for arc velocity, cycle time, voltage fluctuations, and time-average arc characteristics are presented for nitrogen. (auth)

Authors:
;
Publication Date:
Research Org.:
Dartmouth Coll., Hanover, N.H. Thayer School of Engineering
OSTI Identifier:
4756211
Report Number(s):
AD-277562
NSA Number:
NSA-17-015343
DOE Contract Number:  
AF33(657)-8179
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-63
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; AERODYNAMICS; ANODES; BREAKDOWN; CATHODES; CONFIGURATION; COOLING; CURRENTS; ELECTRIC ARCS; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; ELECTRODES; FLUID FLOW; GASES; GENERATORS; LAYERS; LOW TEMPERATURE; MEASURED VALUES; MOTION; NITROGEN; NOZZLES; PLASMA; PLASMA SHEATH; PRESSURE; PULSES; SURFACES; TURBULENCE; VARIATIONS; VELOCITY; VESSELS

Citation Formats

Wheaton, J.R., and Dean, R.C. Jr. ON ANODE GAS-SHEATH ELECTRICAL BREAKDOWN IN A HIGH-PRESSURE-ARC PLASMA GENERATOR. Research Report. United States: N. p., 1961. Web.
Wheaton, J.R., & Dean, R.C. Jr. ON ANODE GAS-SHEATH ELECTRICAL BREAKDOWN IN A HIGH-PRESSURE-ARC PLASMA GENERATOR. Research Report. United States.
Wheaton, J.R., and Dean, R.C. Jr. Sun . "ON ANODE GAS-SHEATH ELECTRICAL BREAKDOWN IN A HIGH-PRESSURE-ARC PLASMA GENERATOR. Research Report". United States.
@article{osti_4756211,
title = {ON ANODE GAS-SHEATH ELECTRICAL BREAKDOWN IN A HIGH-PRESSURE-ARC PLASMA GENERATOR. Research Report},
author = {Wheaton, J.R. and Dean, R.C. Jr.},
abstractNote = {An experimental investigation into the mechanisms of electrical conduction across the low-temperature gas layer covering the cooled anode of a high-pressure nitrogen arc plasma generator is reported. Various flow regimes were identified; the turbulent mode was studied particularly. The cool wall gas sheath is shown to be bridged electrically by a moving concentrated arc. This arc behavior led to a cyclic variation of the potential difference between cathode and anode, but the arc current remained constant. Re-ignition of the arc after each cycle of travel down the nozzle-anode occurred by breakdown of the electrode gap in the neighborhood of the cathode. This breakdowm occurred at abnormally low voltage differences; the evidence indicated that the breakdown is strongly affected by the aerodynamic characteristics of the flow around the cathode. Reduced data for arc velocity, cycle time, voltage fluctuations, and time-average arc characteristics are presented for nitrogen. (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1961},
month = {10}
}

Technical Report:
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