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Journal of Applied Mechanics and Technical Physics

2018 year, number 1

Effect of Condensation on the Size of Strongly Underexpanded Jets Exhausting into a Rarefied Submerged Space

A. E. Zarvin, A. S. Yaskin, V. V. Kalyada
Novosibirsk State University, Novosibirsk, 630090 Russia
Keywords: сверхзвуковая струя, кластерообразование, электронно-пучковая визуализация, supersonic jet, clusterization, electron beam visualization


Exhaustion of supersonic argon and nitrogen jets through sonic and supersonic nozzles into a rarefied submerged space at high stagnation pressures is studied experimentally. The shapes and sizes of the jets are visualized by means of detecting radiation excited in the considered flow by an electron beam. Dependences of the geometric parameters of the jets on exhaustion and clusterization conditions at low Reynolds numbers based on the reference size of the jet are obtained. It is found that the coefficient of proportionality between the size of the first “barrel” of the supersonic jet and the degree of jet expansion increases with an increase in the stagnation pressure. Empirical dependences of the proportionality coefficient on the size of clusters formed in supersonic flows are derived for the first time