Supersonic jet and nozzle flows in uniform-flow and free-vortex aerodynamic windows of gas lasers

Emel’yanov, V. N.; Pustovalov, Alexander; Волков, К. Н.

doi:10.1016/j.actaastro.2019.01.014

“…In cases where stationary energy supply is carried out in a supersonic flow (the energy supply intensity does not exceed a critical value), it is possible to design time-marching calculation schemes [16] (in a supersonic flow, the equations are hyperbolic in the x direction). To speed up the calculations, a vectorized approach to the fluxes calculation is used [17], which allows avoiding the programming of cyclic constructions.…”

Section: Methodsmentioning

confidence: 99%

Flows of real gas in nozzles with unsteady local energy supply

Brykov

¹

,

Emel’yanov

²

,

Karpenko

³

et al. 2021

Computers & Mathematics with Applications

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When gas flows at a high speed in a channel with a variable cross sectional area and highintensity energy supply, it experiences complicated physical and chemical processes producing high-temperature gas effects. High-temperature gas effects are a key issue related to design and optimization of nozzles of plasmatron of alternating current. The finite volume method is applied to solve unsteady compressible Euler equations with high-temperature gas effects. Solutions of some benchmark test cases are reported, and comparison between computational results of chemically equilibrium and perfect air flowfields is performed. The results of numerical simulation of one-dimensional and two-dimensional under-and overexpanded nozzle flows with a moving region of energy supply are presented. Output nozzle parameters are calculated as functions of a number and time of burning of plasmatron arcs. The results obtained show a qualitative pattern of gas dynamics and thermal processes in the nozzle with unsteady energy supply demonstrating the displacement of the nozzle shock wave towards the nozzle outlet in the over-expanded nozzle flow in comparison to perfect gas flow.

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“…The width of the gas cavity is assumed equal to h = 5 mm. The intensity of energy supply is Q = 1 J/cm 3 .…”

Section: One-dimensional Modelmentioning

confidence: 99%

“…In a gas-discharge technological laser, the active element is a chamber filled with a working gas mixture. After the energy supply an excess amount of heat remains in the medium, which leads to increasing of the temperature and pressure of the gas mixture, as well as a change in the physical properties of the active medium [2,3]. Before initiating the next pulse, it is necessary to remove heat and to bring the medium to its initial thermodynamic state.…”

Section: Introductionmentioning

confidence: 99%

Coupled heat transfer in the cavity of constant volume with pulse-periodical energy supply

K.N.

¹

,

V.N.

²

,

A.G.

³

2022

Technical Physics

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The possibilities of organizing a repetitively pulsed process with given frequency characteristics in a cavity of constant volume with an external energy supply to the working gas mixture are considered. Modelling of gas-dynamic and thermal processes is carried out using the numerical solution of the conjugate heat transfer problem. The gas medium is described on the basis of a viscous compressible gas model. To find the temperature field in the walls of the structure, the equation of non-stationary heat conduction is solved. The conjugation of temperature fields in a gas and a solid is carried out using an iterative procedure. In the calculations, the geometrical parameters of the cavity, the density of the energy supply, the initial pressure, and the composition of the working mixture are varied. The results of calculations obtained in the framework of the one-dimensional and two-dimensional formulation of the problem under the action of both a single pulse and a series of pulses are compared. The results obtained demonstrate the possibility of implementing the required frequency characteristics of the process for given geometric and energy parameters. Keywords: pulse-periodical energy process, gas laser, coupled heat transfer, numerical simulation, energy supply, pulse.

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“…В газоразрядном технологическом лазере активный элемент представляет собой камеру, заполненную рабочей газовой смесью. После подвода энергии в среде остается избыточное количество тепла, которое приводит к увеличению температуры и давления газовой смеси, а также изменению физических свойств активной среды [2,3]. Перед инициированием следующего импульса необходимо осуществить отвод тепла и привести среду в исходное термодинамическое состояние.…”

Section: Introductionunclassified

“…Ширина газовой полости полагается равной h = 5 mm. Интенсивность подвода энергии составляет Q = 1 J/cm3 . Температура в щели в начальный момент принимает высокое значение, соответствующее величине подведенной энергии.…”

unclassified

Сопряженный Теплообмен В Области Постоянного Объема При Импульсно-Периодическом Подводе Энергии

Волков¹,

Емельянов²,

Карпенко³

2022

Журнал Технической Физики

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The possibilities of organizing a repetitively pulsed process with given frequency characteristics in a cavity of constant volume with an external energy supply to the working gas mixture are considered. Modelling of gas-dynamic and thermal processes is carried out using the numerical solution of the conjugate heat transfer problem. The gas medium is described on the basis of a viscous compressible gas model. To find the temperature field in the walls of the structure, the equation of non-stationary heat conduction is solved. The conjugation of temperature fields in a gas and a solid is carried out using an iterative procedure. In the calculations, the geometrical parameters of the cavity, the density of the energy supply, the initial pressure, and the composition of the working mixture are varied. The results of calculations obtained in the framework of the one-dimensional and two-dimensional formulation of the problem under the action of both a single pulse and a series of pulses are compared. The results obtained demonstrate the possibility of implementing the required frequency characteristics of the process for given geometric and energy parameters.

show abstract

Supersonic jet and nozzle flows in uniform-flow and free-vortex aerodynamic windows of gas lasers

Cited by 10 publications

References 18 publications

Flows of real gas in nozzles with unsteady local energy supply

Flows of real gas in nozzles with unsteady local energy supply

Coupled heat transfer in the cavity of constant volume with pulse-periodical energy supply

Сопряженный Теплообмен В Области Постоянного Объема При Импульсно-Периодическом Подводе Энергии

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