title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð³Ð°Ð·Ð¾Ð´Ð¸Ð½Ð°Ð¼Ð¸ÐºÐ¸ Ð² ÑÐ¸ÑÑÐµÐ¼Ðµ Ð¸Ð½Ð¶ÐµÐºÑÐ¸Ð¸ Ð´Ð¸Ð°Ð³Ð½Ð¾ÑÑÐ¸ÐºÐ¸ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² Ð¿ÐµÑÐ¸ÑÐµÑÐ¸Ð¹Ð½Ð¾Ð¹ Ð¿Ð»Ð°Ð·Ð¼Ñ Ð½Ð° ÑÐ¾ÐºÐ°Ð¼Ð°ÐºÐµ "ÐÐ»Ð¾Ð±ÑÑ-Ð2"
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Investigation of gas dynamics in the injection system for peripheral plasma di-agnostic on "Globus-M2"
Creators: name: ÐÐ¾ÑÐ¾Ð±ÐºÐ¾, ÐÐ¼Ð¸ÑÑÐ¸Ð¹
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2022
Subjects: Ð³Ð°Ð·Ð¾Ð´Ð¸Ð½Ð°Ð¼Ð¸ÐºÐ°
Ð´Ð¸Ð°Ð³Ð½Ð¾ÑÑÐ¸ÐºÐ° Ð¿ÑÐ¸ÑÑÐµÐ½Ð¾ÑÐ½Ð¾Ð¹ Ð¿Ð»Ð°Ð·Ð¼Ñ
Ð²ÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½Ð°Ñ Ð³Ð¸Ð´ÑÐ¾Ð´Ð¸Ð½Ð°Ð¼Ð¸ÐºÐ°
Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ
ÑÐ¾Ð¿Ð»Ð¾ ÐÐ°Ð²Ð°Ð»Ñ
gas dynamics
peripheral plasma diagnostic
injection system
computational fluid dynamics
ANSYS FLUENT
simulation
de Laval nozzle

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description: The subject of the graduate qualification work is âInvestigation of gas dynamics in the injection system for peripheral plasma diagnostic on "Globus-M2" tokamakâ.Â This work is devoted to modeling the neutral helium flow in the injection system for peripheral plasma parameters diagnostic. The aim of the work is to find a numerical solution for the axisymmetric distribution of the density and velocity of a helium jet that is flowing into a vacuum without considering the influence of the plasma. Knowledge of such parameters âânot only makes it possible to judge the degree of locality of the helium beam and the effectiveness of diagnostic, but it will also allow us to improve the collisional-radiative model by taking into account the velocity and concentration of neutral helium. The work was carried out in the ANSYS program using Fluent CFD code, which is widely used to solve several hydrodynamic problems: from calculating the flow of chemical reactions in a multiphase medium to designing an aircraft wing or engine. As a result of the work, the jet parameters were obtained in the case of helium outflow from the capillary, and two variants of supersonic Laval nozzles were calculated, designed and simulated. Such nozzle is supposed to be used to optimize the injection system in order to improve the compactness of the jet and increase its penetration depth into the plasma. This would make it possible to increase the spatial range of application of diagnostics and improve its measurement accuracy. From the results of the work, it can be concluded that the profile of the Laval nozzle has a rather significant effect on the jet density distribution, but only slightly on the velocity distribution. Correctly calculated nozzle profile will significantly narrow the gas jet but cannot significantly increase the characteristic velocity.