稀薄な非平衡電離気体のノズルの流れの実験に関する一、二の問題

概要

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Two problems are considered in connection with the experiments on the nozzle flow of slightly ionized gases in which the electron temperature is much higher than the gas temperature. First, the electron temperature along the nozzle axis is measured by the electrostatic probes, whose configurations are a disk, a cylinder and a cone and whose diameters are 0.5mm, when the flow Mach number is about 1.7 at the exit of the nozzle, the mean free path of gas atoms is 5×10^-3〜10^-2cm and the mean free path for electron-atom collisions is 0.5〜1cm. The measured values of the electron temperature by these probes indicate no appreciable differences within the present experimental accuracy. It may be concluded that the electron temperature which is measured by these probes is identified with the electron temperature in the flow which is not disturbed by these probes. Secondly, it is shows that the flow Mach number can be estimated from observation of the luminous region ahead of a sphere located in the flow at the exit of the nozzle.
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