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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">izmertech-325</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МЕХАНИЧЕСКИЕ ИЗМЕРЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MECHANICAL MEASUREMENTS</subject></subj-group></article-categories><title-group><article-title>Сравнительный анализ коэффициентов истечения критических сопел</article-title><trans-title-group xml:lang="en"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Даев</surname><given-names>Ж. А.</given-names></name></name-alternatives><email xlink:type="simple">zhand@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Султанов</surname><given-names>Н. З.</given-names></name></name-alternatives><email xlink:type="simple">sultanov@mail.osu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Оренбургский государственный университет; Актюбинский университет им. С. Баишева<country>Россия</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Оренбургский государственный университет<country>Россия</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>07</day><month>02</month><year>2023</year></pub-date><volume>0</volume><issue>7</issue><fpage>51</fpage><lpage>54</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ФГУП "ВНИИФТРИ", 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">ФГУП "ВНИИФТРИ"</copyright-holder><copyright-holder xml:lang="en">ФГУП "ВНИИФТРИ"</copyright-holder><license xlink:href="https://www.izmt.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.izmt.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/325">https://www.izmt.ru/jour/article/view/325</self-uri><abstract><p>Проведён сравнительный и статистический анализ коэффициентов истечения критических сопел с тороидальным патрубком. Проанализированы основные подходы, связанные с определением коэффициентов истечения. Приведены уравнения зависимостей, полученных для описания изменений коэффициентов истечения критических сопел как функций числа Рейнольдса. На примере критических сопел Вентури рассмотрены факторы, влияющие на точность измерения расхода газа.</p></abstract><trans-abstract xml:lang="en"><p>A comparative and statistical analysis of the escape rates of critical nozzles with a toroidal branch pipe is carried out. It analyzes the main approaches associated with determining the discharge coefficient. The equations of dependences obtained for describing changes of the discharge coefficients of critical nozzles as functions of the Reynolds number are given. On the example of critical Venturi nozzles, factors affecting the accuracy of measuring gas flow are considered.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>критические сопла</kwd><kwd>расход газа</kwd><kwd>коэффициент истечения</kwd><kwd>расходомеры</kwd><kwd>преобразователь расхода</kwd><kwd>critical nozzles</kwd><kwd>gas flow</kwd><kwd>discharge coefficient</kwd><kwd>flowmeters</kwd><kwd>flow transducer</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Герасимов А. П., Иванов В. П., Красавин В. М., Лахов В. М., Раинчик С. В., Семёнова О. К. Область применения сопел Лаваля в расходомерной технике // Измерительная техника. 2005. № 4. С. 48-52.</mixed-citation><mixed-citation xml:lang="en">Герасимов А. П., Иванов В. П., Красавин В. М., Лахов В. М., Раинчик С. В., Семёнова О. К. 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