TY - JOUR

T1 - Specific Features of Formation of Supersonic Jets of Rarefied Gases under Conditions of Developed Condensation

AU - Дубровин, Кирилл Алексеевич

AU - Зарвин, Александр Евгеньевич

AU - Ребров, Алексей Кузьмич

N1 - This study was performed on the basis of the Collective Use Center of the Applied Physics Division of the Department of Physics of the Novosibirsk State University and was supported by the Ministry of Science and Higher Education of the Russian Federation (Grant No. FSUS-2020-0039). Публикация для корректировки.

PY - 2023/10

Y1 - 2023/10

N2 - Specific features of gas flows exhausting from supersonic nozzles to a flooded medium under conditions of clusterization are considered. Radiation of particles in the flow is initiated by a well-focused high-voltage electron beam. Radiation is measured by a high-resolution camera and a spectrometer with a wide range of wavelengths. For characteristic sizes of jets of condensing gases in the entire range of examined stagnation pressures and background ambient space, it is possible to use the same dependence on the parameters as that in the case with a correction factor for taking into account the influence of condensation, which, in turn, depends on the cluster size. The form of the correction factor is presented. The dependence of the previously detected process of formation of a secondary external jet in flows of easily condensing gases (“cluster wake") is studied. The reasons and conditions for the emergence of this effect are considered. The processes of formation of the traditional spindle-shaped jet and the new secondary jet are compared. The results of measurements of the diameters of the traditional and secondary jets in the maximum cross sections by means of photometry in various exhaust regimes are reported. The reasons for the differences in formation of the traditional and secondary jets under conditions of developed condensation of particles are considered. The “cluster wake" is found to affect the process of gas penetration from the ambient space to the supersonic flow. Specific features of radiation of the particles of the “cluster wake" are considered, and the time of existence of radiation in the excited state is estimated.

AB - Specific features of gas flows exhausting from supersonic nozzles to a flooded medium under conditions of clusterization are considered. Radiation of particles in the flow is initiated by a well-focused high-voltage electron beam. Radiation is measured by a high-resolution camera and a spectrometer with a wide range of wavelengths. For characteristic sizes of jets of condensing gases in the entire range of examined stagnation pressures and background ambient space, it is possible to use the same dependence on the parameters as that in the case with a correction factor for taking into account the influence of condensation, which, in turn, depends on the cluster size. The form of the correction factor is presented. The dependence of the previously detected process of formation of a secondary external jet in flows of easily condensing gases (“cluster wake") is studied. The reasons and conditions for the emergence of this effect are considered. The processes of formation of the traditional spindle-shaped jet and the new secondary jet are compared. The results of measurements of the diameters of the traditional and secondary jets in the maximum cross sections by means of photometry in various exhaust regimes are reported. The reasons for the differences in formation of the traditional and secondary jets under conditions of developed condensation of particles are considered. The “cluster wake" is found to affect the process of gas penetration from the ambient space to the supersonic flow. Specific features of radiation of the particles of the “cluster wake" are considered, and the time of existence of radiation in the excited state is estimated.

KW - " electron beam

KW - external secondary flow

KW - formation of clusters

KW - lifetime of particles in the excited state

KW - penetration of the background gas

KW - supersonic jet

KW - “cluster wake

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85182464616&origin=inward&txGid=933379013aacd07d5673d3e602e46559

UR - https://www.mendeley.com/catalogue/b1a2cd2d-0882-3a6a-9ad7-16eff0a941d9/

U2 - 10.1134/S0021894423050085

DO - 10.1134/S0021894423050085

M3 - Article

VL - 64

SP - 793

EP - 804

JO - Journal of Applied Mechanics and Technical Physics

JF - Journal of Applied Mechanics and Technical Physics

SN - 0021-8944

IS - 5

ER -