Abstract
A method for introducing optical inhomogeneities (OI) into a subsonic plasma jet is described. High-speed visualization of such OI opens the possibility of determining spatial distributions of plasma motion velocity. Small-diameter cylindrical graphite and copper rods were used as the OI source. The results obtained from recording the OI motion photographic images with simultaneously recording the plasma emission spectra near the marker surface indicate that the plasma jet hydrodynamic and thermal perturbations are insignificant in nature. It has been experimentally established that the time for which the Cu and C rods 1 mm in diameter withstand the effect of argon, nitrogen and air plasma jets with a bulk temperature of about 10 000 K and velocity of 100...200 m/s without destruction is 0.4...1.0 s. This time is enough to obtain a complete motion pattern of the OI introduced into the plasma jet in a segment with a length of several jet diameters at a video recording rate of around 10 000 s–1. The article describes an algorithm for processing video images by means of software with a view to obtain the subsonic plasma jet velocity field, which involves determination of the spatial-temporal changes in the IO boundaries by sequentially constructing the gradient field of their luminescence intensities, recognizing, filtering, and comparing the IO boundaries.
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