TY - JOUR

T1 - Structure of a supersonic gas jet under conditions of developed condensation

AU - Zarvin, A. E.

AU - Yaskin, A. S.

AU - Kalyada, V. V.

AU - Ezdin, B. S.

N1 - Funding Information: This work was supported in part by the Government of the Russian Federation (contract no. 14.Z50.31.0019) and the Ministry of Education and Science of the Russian Federation (NGU research project no. 2292). Publisher Copyright: © 2015, Pleiades Publishing, Ltd. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.

PY - 2015/11/1

Y1 - 2015/11/1

N2 - The method of flow visualization by electron-beam-induced radiation emission has been used to study the shape and structure of supersonic gas jets emitted into rarefied submerged space via sonic and supersonic nozzles from a forechamber at high pressure (stagnation pressure P0). It is established that the longitudinal size of a traditional primary supersonic jet increases with the stagnation pressure at fixed ratio P0/Ph, where Ph is the surrounding background gas pressure. This character of jet expansion via both sonic and supersonic nozzles is related to variation of the condensate fraction and average cluster size in the jet. Under the conditions of formation of large-size clusters in the supersonic jet of argon, a nontraditional gas jet shape with a long “wake” has been observed. No such secondary structure has been observed during the expansion of noncondensing helium and weakly condensing nitrogen. It is suggested that the formation of wake under conditions of developed condensation and significant rarefaction is related to the formation of a secondary clustered jet.

AB - The method of flow visualization by electron-beam-induced radiation emission has been used to study the shape and structure of supersonic gas jets emitted into rarefied submerged space via sonic and supersonic nozzles from a forechamber at high pressure (stagnation pressure P0). It is established that the longitudinal size of a traditional primary supersonic jet increases with the stagnation pressure at fixed ratio P0/Ph, where Ph is the surrounding background gas pressure. This character of jet expansion via both sonic and supersonic nozzles is related to variation of the condensate fraction and average cluster size in the jet. Under the conditions of formation of large-size clusters in the supersonic jet of argon, a nontraditional gas jet shape with a long “wake” has been observed. No such secondary structure has been observed during the expansion of noncondensing helium and weakly condensing nitrogen. It is suggested that the formation of wake under conditions of developed condensation and significant rarefaction is related to the formation of a secondary clustered jet.

UR - http://www.scopus.com/inward/record.url?scp=84958166870&partnerID=8YFLogxK

U2 - 10.1134/S1063785015110279

DO - 10.1134/S1063785015110279

M3 - Article

AN - SCOPUS:84958166870

VL - 41

SP - 1103

EP - 1106

JO - Technical Physics Letters

JF - Technical Physics Letters

SN - 1063-7850

IS - 11

ER -