Abstract
Abstract Radial recovery characteristics of high current (40 kA) spark channels in air at atmospheric pressure have been measured using re-ignition voltage technique and pressure probe technique. In the case of re-ignition voltage measurement the temperature was derived by assuming the validity of Paschen's law at the Into recovery period, whereas in the case of pressure probe, measurements of local sound velocity were used to derive the gas temperature. The derived temperature profiles of the spark channel under similar experimental conditions show a uniform temperature profile near the centre of the channel. The boundaries of the spark channels measured by these techniques are not well defined as compared with previous results using the shock-wave Schlieren technique. Discrepancies of results obtained by the present two different sensing techniques are found and are explained as due to the large cooling effects of the re-ignition voltage probes.
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