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Journal of Applied Mechanics and Technical Physics

2018 year, number 5

Investigation of the Flow Structure on a Small-Scale Gas-Dynamic Setup: Identification of the Secondary Flow in the Case of Exhaustion of a Clustered Supersonic Jet into a Rarefied Space

K. A. Dubrovin, A. E. Zarvin, V. V. Kalyada, V. E. Khudozhitkov, A. S. Yaskin
Novosibirsk State University, Novosibirsk, 630090, Russia
Keywords: разреженный газ, сверхзвуковая струя, моделирование на лабораторных стендах, кластер, фотометрия, спектроскопия, rarefied gas, supersonic jet, modeling on laboratory setups, cluster, photometry, spectroscopy

Abstract

A possibility of using small-scale vacuum setups for experimental investigations of supersonic jets escaping from supersonic nozzles into vacuum or a rarefied space is considered. Results of studying the structure of the secondary supersonic flow formed in supersonic jets with developed condensation, which is detected for the first time, are reported. The present investigations are carried out with the use of photometry and spectrometry of jets with the use of emission excited by an electron beam; flow visualization is also performed. The results obtained in the study are analyzed; capabilities and specific features of various methods of flow registration are considered. An empirical model, which establishes the dependence between the detected secondary flow and the process of formation of large clusters in the flow, is developed and justified.