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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Doklady Physics</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Physics</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Физика, технические науки</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7400</issn><issn publication-format="electronic">3034-5081</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">697841</article-id><article-id pub-id-type="doi">10.7868/S3034508125050072</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>МЕХАНИКА</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">TO THE PROCESS OF TRANSONIC TRANSITION OF FLOW IN A NOZZLE</article-title><trans-title-group xml:lang="ru"><trans-title>К ПРОЦЕССУ ТРАНСЗВУКОВОГО ПЕРЕХОДА ТЕЧЕНИЯ В СОПЛЕ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bogdanov</surname><given-names>A. N.</given-names></name><name xml:lang="ru"><surname>Богданов</surname><given-names>А. Н.</given-names></name></name-alternatives><email>bogdanov@imec.msu.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Bauman Moscow State Technical University</institution></aff><aff><institution xml:lang="ru">Московский государственный технический университет имени Н.Э. Баумана</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2025</year></pub-date><volume>524</volume><issue>1</issue><issue-title xml:lang="en">VOL 524, NO1 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 524, №1 (2025)</issue-title><fpage>45</fpage><lpage>49</lpage><history><date date-type="received" iso-8601-date="2025-12-05"><day>05</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-09-15"/></permissions><self-uri xlink:href="https://jdigitaldiagnostics.com/2686-7400/article/view/697841">https://jdigitaldiagnostics.com/2686-7400/article/view/697841</self-uri><abstract xml:lang="en"><p>The possibility of existence of inflection points on the sonic line is substantiated. This approach to the analysis of transonic transition allows us to substantiate the possibility of a continuous process of flow restructuring during acceleration of a transonic nozzle from subsonic to supersonic mode.</p></abstract><trans-abstract xml:lang="ru"><p>Обоснована возможность существования точек перегиба на звуковой линии. Такой подход к анализу трансзвукового перехода позволяет обосновать возможность непрерывного процесса перестройки течения при разгоне трансзвукового сопла от дозвукового режима к сверхзвуковому.</p></trans-abstract><kwd-group xml:lang="en"><kwd>aerodynamics</kwd><kwd>transonic flow</kwd><kwd>flow in a nozzle</kwd><kwd>mathematical modeling</kwd><kwd>analytical methods</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>аэродинамика</kwd><kwd>трансзвуковое течение</kwd><kwd>течение в сопле</kwd><kwd>математическое моделирование</kwd><kwd>аналитические методы</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено в рамках государственного задания МГУ имени М.В. Ломоносова (№ АААА-А19-119012990113-1).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Barantsev R.G. Lectures on transonic gas dynamics. 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