Emission properties of targets based on shock waves excited by pulsed laser radiation

Nechay, A. N.; Perekalov, A. A.; Чхало, Н. И.; Salashchenko, N. N.; Korepanov, M; Koroleva, M.R.

doi:10.1016/j.optlastec.2021.107250

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…Данный подход ранее был успешно применен для описания недорасширенных струй криптона за микросоплами. Результаты расчетов согласуются с экспериментальными данными [15]. Задача решается методом контрольных объемов [19] на основе авторского кода.…”

Section: рис 1 схема расчетной области Fig 1 Sketch Of the Calculatio...unclassified

“…Целью проводимых исследований является определение особенностей течений в микросопле при различных значениях давления торможения в предсопловом объеме, в том числе при возникновении конденсированной фазы в потоке. Работа является продолжением, проводившихся ранее в работах [10,[14][15][16] по изучениюю течений инертных газов в микросоплах.…”

Section: Introductionunclassified

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Parametric investigations of flows in micronozzles

Mitryukova¹

2023

Proceedings of ISP RAS

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The work is devoted to parametric investigations of the krypton flow in a conical micronozzle when flowing into a region with low pressure. The features of the flows are studied at various values of the stagnation pressure in the pre-nozzle volume, including the occurrence of a condensed phase in the flow. Mathematical modeling was carried out on the basis of a numerical solution of the complete system of Navier-Stokes equations, supplemented by the equation for the mass fraction of the condensate. The mathematical model takes into account the change in the coefficients of dynamic viscosity and thermal conductivity depending on the gas temperature. The problem was solved by the control volume method on a block-structured regular grid of quadrangular elements using schemes of the second order of accuracy. The equations were integrated with respect to time using the Runge-Kutta method. The calculations were carried out at stagnation pressures of 5, 10, and 15 atm for single-phase and two-phase flows. The distribution fields of temperature and Mach number in the nozzle and in the space behind it are presented. The axial distribution of pressure, temperature, and Mach number has been studied. It is shown that in the case of a single-phase flow, self-similarity of gas flows is observed. The pressure fields were similar, but in a dimensionless form they coincided to each other. In this case, the identity of the velocity and temperature fields was observed at different values of the stagnation pressure. The self-similarity of the flow is violated in the zone of formation of condensed particles. The dimensions of the zones of local temperature increase, as well as the intensity of heat release, depend on the given stagnation pressure, which is reflected in the velocity characteristics of the flow.

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Section: рис 1 схема расчетной области Fig 1 Sketch Of the Calculatio...unclassified

Section: Introductionunclassified

Parametric investigations of flows in micronozzles

Mitryukova¹

2023

Proceedings of ISP RAS

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“…Micronozzles are applied to produce high-speed collimated beams of microparticles for various technologies, namely, for a new spray method CAD-DW (Collimated Aerosol Beam Direct-Write) [8]. Nozzles for supersonic velocities are applied to form gas-jet targets of plasma gas extra ultraviolet emission sources [5,15]. In this case, the high power of EUV emission relies heavily on the properties of the gas flow fed, as a rule, through supersonic micronozzles with a high divergence ratio into high vacuum [14].…”

Section: Introductionmentioning

confidence: 99%

“…In the works mentioned above, condensate either was not taken into account or the motion of the formed twophase flow was studied, when condensation was finished and did not develop. Numerical studies of the condensation nuclei initiation process, their further growth and interaction with gas flow within a single velocity model of homogeneous condensation were carried out in [10,11,15]. The studies showed that the condensation process begins at the nozzle throat.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Effects of Krypton Flow in a Micronozzle with a Cylindrical Tube

Korepanov¹,

Koroleva²,

Mitrukova³

et al. 2022

Nelin. Dinam.

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The paper expresses a mathematical model of homogeneous gas motion with respect to formation processes and the growth of condensation nuclei. Since the condensed particles are small, the research is carried out with a single velocity motion model. The results obtained have shown that the application of the cylindrical tube leads to nonlinear flow effects. The flow responds to: the geometrical exposure related to flow transition from the conical diverging nozzle

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