Concentration of a plasma energy flow by a blowing gas

Experiments were carried out on the concentration of the energy flow density of a thermal argon plasma and the concentration of the heat flux from a plasma jet to a flat plate by an injected gas blowing radially inwards through a slit around the nozzle outlet. The Q-value, which is analogous to the sharpness of the resonance curve of an electrical circuit, and which is defined as the ratio of the maximum energy flow to its half width, was used to evaluate the degree of concentration achieved. Both Q values attained maxima with a radially blowing gas at about the same rate of flow.