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<article xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" dtd-version="1.4" article-type="research-article" xml:lang="en"><front><journal-meta><journal-title-group><journal-title xml:lang="ru">Математическая физика и компьютерное моделирование</journal-title></journal-title-group><issn publication-format="print">2587-6325</issn><issn publication-format="electronic">2587-6902</issn></journal-meta><article-meta><article-id pub-id-type="doi">10.15688/mpcm.jvolsu.2024.1.3</article-id><article-categories><subj-group><subject>Other</subject></subj-group></article-categories><title-group><article-title xml:lang="ru">Газодинамические неустойчивости в неравновесной химически активной среде</article-title><trans-title-group xml:lang="en"><trans-title>Gas-dynamic instabilities in a nonequilibrium chemically active medium</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Храпов</surname><given-names>Сергей Сергеевич</given-names></name><name xml:lang="en"><surname>Khrapov</surname><given-names>Sergey S.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><aff-alternatives id="aff1"><aff xml:lang="en"><institution>Volgograd State University (Volgograd, Russian Federation)</institution></aff><aff xml:lang="ru"><institution>Волгоградский государственный университет (Волгоград, Российская Федерация)</institution></aff></aff-alternatives></contrib-group><pub-date pub-type="epub" iso-8601-date="2024-04-25"><day>25</day><month>04</month><year>2024</year></pub-date><volume>27</volume><issue>1</issue><fpage>26</fpage><lpage>44</lpage><history><date date-type="received" iso-8601-date="2023-12-25"><day>25</day><month>12</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2024-01-15"><day>15</day><month>01</month><year>2024</year></date></history><permissions><license xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:title="CC BY 4.0"><ali:license_ref>https://creativecommons.org/licenses/by/4.0/</ali:license_ref><license-p xml:lang="ru">CC BY 4.0</license-p></license></permissions><abstract xml:lang="ru"><p>Получено дисперсионное уравнение, описывающее динамику акустических и энтропийных мод в неравновесном химически активном газе с учетом вязкости, теплопроводности и произвольных зависимостей времени колебательной релаксации, удельной мощности нагрева и охлаждения от плотности и температуры. Исследована линейная динамика акустической неустойчивости в неравновесном химически активном газе. Проведен анализ влияния параметров химической реакции на акустический инкремент и фазовую скорость звука. Проанализированы области с аномальными значениями фазовой скорости звука и акустического инкремента, которые попадают в зону запрещенных звуковых частот. Исследована линейная динамика тепловой неустойчивости в неравновесном химически активном газе. Проведен анализ влияния параметров химической реакции на инкремент неустойчивости и фазовую скорость энтропийных мод. Определены пороговые значения степени неравновесности среды, при превышении которых возможно развитие тепловой неустойчивости. Построена математическая модель динамики линейных возмущений в неравновесной химически активной среде с неоднородным распределением вдоль одной из пространственных координат параметров течения. Получены дисперсионные уравнения, описывающие линейную динамику неустойчивости Кельвина — Гельмгольца, неустойчивых симметричных и антисимметричных мод в неравновесных химически активных сверхзвуковых струях. Исследовано влияние колебательной релаксации и химической активности в неравновесном газе на устойчивость тангенциального разрыва скорости. Показано, что учет колебательной релаксации и химической активности в неравновесном газе приводит к существенному усилению как неустойчивости Кельвина —Гельмгольца для всех режимов течения (дозвуковых и сверхзвуковых), так и неустойчивых симметричных и антисимметричных мод струи. Исследована устойчивость раздела двух покоящихся химически активных сред, различающихся величиной степени неравновесности. Показано, что для типичных значений параметров неравновесных колебательно-возбужденных химически активных сред мнимая часть частоты оказывается положительной, то есть граница раздела неустойчива.</p></abstract><abstract xml:lang="en" abstract-type="summary"><p>A dispersion equation is obtained that describes the dynamics of acoustic and entropy modes in a nonequilibrium chemically active gas, taking into account viscosity, thermal conductivity and arbitrary dependences of the vibrational relaxation time, specific heating and cooling power on density and temperature. The linear dynamics of acoustic instability in a nonequilibrium chemically active gas has been studied. An analysis of the influence of chemical reaction parameters on the acoustic increment and phase speed of sound was carried out. Areas with anomalous values of the phase speed of sound and acoustic increment, which fall into the zone of forbidden sound frequencies, are analyzed. The linear dynamics of thermal instability in a nonequilibrium chemically active gas has been studied. An analysis of the influence of chemical reaction parameters on the instability increment and the phase velocity of entropy modes was carried out. Threshold values for the degree of non-equilibrium of the environment have been determined, above which thermal instability may develop. A mathematical model of the dynamics of linear disturbances in a nonequilibrium chemically active medium with a non-uniform distribution of flow parameters along one of the spatial coordinates has been constructed. Dispersion equations are obtained that describe the linear dynamics of the Kelvin-Helmholtz instability, unstable symmetric and antisymmetric modes in nonequilibrium chemically active supersonic jets. The influence of vibrational relaxation and chemical activity in a nonequilibrium gas on the stability of a tangential velocity discontinuity has been studied. It is shown that taking into account vibrational relaxation and chemicalctivity in a nonequilibrium gas leads to a significant increase in both the Kelvin-Helmholtz instability for all flow modes (subsonic and supersonic) and unstable symmetric and antisymmetric jet modes. The stability of the interface between two quiescent chemically active media, differing in the degree of nonequilibrium, has been studied. It is shown that for typical values of the parameters of nonequilibrium vibrationally excited chemically active media, the imaginary part of the frequency turns out to be positive, i.e. the interface is unstable.</p></abstract><kwd-group xml:lang="ru"><kwd>неравновесный газ</kwd><kwd>колебательная релаксация</kwd><kwd>химические реакции</kwd><kwd>акустическая и тепловая неустойчивости</kwd><kwd>неустойчивость Кельвина — Гельмгольца</kwd></kwd-group><kwd-group xml:lang="en"><kwd>nonequilibrium gas</kwd><kwd>vibrational relaxation</kwd><kwd>chemical reactions</kwd><kwd>acoustic and thermal instabilities</kwd><kwd>Kelvin-Helmholtz instability</kwd></kwd-group></article-meta></front><back><ref-list><ref id="ref1"><mixed-citation publication-type="other" xml:lang="ru">Динамика малых возмущений в неравновесном колебательно-возбужденном газе / С. С. Храпов, Г. С. Иванченко, В. П. Радченко, И. С. 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