抄録
Effect of spatial distribution of airflow velocity on electron density of an arc around current zero was investigated in a flat-type arc quenching chamber. Varying the width of a nozzle inlet allowed to obtain different distributions of airflow velocities in the quenching chamber. For each of the nozzle inlet the profile of airflow velocity at the nozzle throat and the length of the vortex in front of an upstream electrode were calculated in the absence of the arc. Furthermore, an electron density around the current zero of an interrupting current at above-mentioned two locations was measured by means of the attention characteristic of 70GHz microwave. From the experimental and calculation results, distinct dependence of the electron density on the airflow velocity distribution was found.
