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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Plasma Physics Reports</journal-id><journal-title-group><journal-title xml:lang="en">Plasma Physics Reports</journal-title><trans-title-group xml:lang="ru"><trans-title>Физика плазмы</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0367-2921</issn><issn publication-format="electronic">3034-6371</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">668550</article-id><article-id pub-id-type="doi">10.31857/S036729212360022X</article-id><article-id pub-id-type="edn">VFGSGE</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>LOW TEMPERATURE PLASMA</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>НИЗКОТЕМПЕРАТУРНАЯ ПЛАЗМА</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Parameters of a Longitudinal DC Discharge in a Supersonic Air Flow</article-title><trans-title-group xml:lang="ru"><trans-title>Параметры продольного разряда постоянного тока в сверхзвуковом потоке воздуха</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Troshkin</surname><given-names>R. S.</given-names></name><name xml:lang="ru"><surname>Трошкин</surname><given-names>Р. С.</given-names></name></name-alternatives><email>af@jiht.org</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Firsov</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Фирсов</surname><given-names>А. А.</given-names></name></name-alternatives><email>valentin.bityurin@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Joint Institute for High Temperatures, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Объединенный институт высоких температур РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Joint Institute for High Temperatures, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Объединенный институт высоких температур РАН (ОИВТ РАН)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-05-01" publication-format="electronic"><day>01</day><month>05</month><year>2023</year></pub-date><volume>49</volume><issue>5</issue><issue-title xml:lang="ru"/><fpage>495</fpage><lpage>503</lpage><history><date date-type="received" iso-8601-date="2025-02-26"><day>26</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Российская академия наук</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0367-2921/article/view/668550">https://journals.eco-vector.com/0367-2921/article/view/668550</self-uri><abstract xml:lang="en"><p>This work is devoted to the study of the properties of a discharge in a supersonic air flow and the problem of determining the temperature of a contracted (thin cylindrical) plasma channel with a radial temperature distribution. The paper considers a direct discharge 30 mm long far from the channel walls in the core of a supersonic flow with the following parameters: Mach number M = 2, flow rate V ~ 500 m/s, stagnation temperature T0 = 300 K, and static gas pressure Pst = 22 kPa. The axisymmetric geometry of the ex-periments with two coaxial electrodes located parallel to the flow was chosen to avoid the appearance of a part of the current channel perpendicular to the flow and the corresponding discharge pulsations. The current–voltage characteristic was obtained, and the dependences of the temperature of the electric discharge plasma on the electrical parameters of the discharge were obtained using emission spectroscopy. Also, with the help of shadow visualization and high-speed shooting, an estimate was obtained of the thickness of the thermal cone and the discharge channel and their dependence on the discharge current.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181323913040">Исследованы свойства электрического разряда в сверхзвуковом потоке воздуха и проблема определения температуры контрагированного плазменного канала с радиальным распределением температуры. Рассмотрен прямой разряд длиной 30 мм вдали от стенок канала в ядре сверхзвукового потока с параметрами: число Маха M = 2, скорость потока <italic>V</italic> ~ 500 м/с, температура торможения <italic>T</italic><sub>0</sub> = 300 K, статическое давление газа <italic>P<sub>st</sub></italic> = 22 кПа. Осесимметричная геометрия экспериментов в конфигурации с двумя соосными электродами, расположенными параллельно потоку, была выбрана во избежание появления части канала тока, перпендикулярной потоку, и соответствующих пульсаций разряда. Получена вольтамперная характеристика разряда, и с помощью эмиссионной спектроскопии были установлены зависимости температуры электроразрядной плазмы от электрических параметров разряда. Также с помощью метода теневой визуализации и высокоскоростной съемки была получена оценка толщины теплового конуса, размера разрядного канала и их зависимость от тока разряда.</p></trans-abstract><kwd-group xml:lang="en"><kwd>DC electric discharge</kwd><kwd>arc discharge</kwd><kwd>supersonic flow</kwd><kwd>emission spectroscopy</kwd><kwd>gas temperature</kwd><kwd>discharge channel parameters</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>электрический разряд постоянного тока</kwd><kwd>дуговой разряд</kwd><kwd>сверхзвуковой поток</kwd><kwd>эмиссионная спектроскопия</kwd><kwd>температура газа</kwd><kwd>параметры разрядного канала</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Alferov V.I., Bushmin A.S. // Sov. Phys. 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