ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Experimental Study of the Discharge Characteristic of Nanosecond Voltage Pulses in Supersonic Flow
Received date: 2013-08-07
Revised date: 2013-10-08
Online published: 2013-12-08
Supported by
National Natural Science Foundation of China (11372352, 51306207); The Project Supported by Natural Science Basic Research Plan in Shaanxi Province of China (2013JQ1016)
Producing a supersonic conductive flow field is the foundation of the study of magnetohydrodynamics(MHD). Nanosecond pulsed dielectric barrier discharges is one effective method capable of producing large-scale and homogeneous plasmas in cold, supersonic air. An experimental system of ionizing supersonic air based on a double-throat tunnel is presented, and the data of voltage and current measured in static and supersonic air are analyzed respectively. Certain conclusions are drawn from the experiments. First, the stable working time of the wind tunnel is about 16 s, which is enough to guarantee the discharge experiments to work reliably and obtain effective measurements of the data. Second, for the nanosecond pulsed dielectric barrier discharges, the air breakdown is restricted by the value of the electric field strength, not its change rate. Third, in supersonic condition the breakdown voltage changes randomly with the density fluctuation of the flow field, while the velocity rarely influences it. In addition, after air breakdown, the supersonic flow field rarely influences the discharge. Fourth, the peak of the current during air breakdown is determined by the breakdown voltage and the number of free electrons in the experimental environment.
YANG Pengyu , ZHANG Bailing , LI Yiwen , ZHANG Yang . Experimental Study of the Discharge Characteristic of Nanosecond Voltage Pulses in Supersonic Flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(6) : 1539 -1548 . DOI: 10.7527/S1000-6893.2013.0412
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