Investigation of energetic parameters of supersonic low-pressure nonequilibrium jets by molecular beam probing
A.E. Zarvin, E.D. Dering, K.A. Dubrovin, V.V. Kalyada
Novosibirsk State University, Novosibirsk, Russia
Keywords: rarefied gas dynamics, supersonic jet, molecular beam, perpendicular velocity ratio, translational temperature, cluster formation, skimming
Abstract
This paper aims to expand the capabilities of experimental studies of the gas dynamics of supersonic, highly rarefied jets by employing new diagnostic tools for determining flow energy parameters. Known methods for measuring temperature in a rarefied gas flow are considered. A detailed description of the chosen methodology and equipment for measuring transverse molecular beam density (or intensity) profiles and determining the perpendicular velocity ratio from them is provided. A comparison of a large array of experimental data with known theoretical models confirms the reliability of the obtained information. The possibilities and conditions for calculating the translational (perpendicular) temperature are considered. The error and range of reliability of the obtained results, the influence of concomitant processes of skimmer interaction and penetration of background gas into the jet on the recorded parameters, as well as the possibility of expanding the range of research using this method are discussed.
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