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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">pimi</journal-id><journal-title-group><journal-title xml:lang="ru">Приборы и методы измерений</journal-title><trans-title-group xml:lang="en"><trans-title>Devices and Methods of Measurements</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-9506</issn><issn pub-type="epub">2414-0473</issn><publisher><publisher-name>BNTU</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21122/2220-9506-2021-12-1-67-74</article-id><article-id custom-type="elpub" pub-id-type="custom">pimi-701</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>Методы измерений, контроля, диагностики</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Methods of measurements, monitoring, diagnostics</subject></subj-group></article-categories><title-group><article-title>Разработка и апробация методики оценки точности корреляционного определения скорости потока теплоносителя при исследованиях гидродинамики турбулентных потоков в элементах ядерных реакторов</article-title><trans-title-group xml:lang="en"><trans-title>Development and Testing of a Methodology for Assessing of the Correlation Velocity Measurements’ Accuracy for the Hydrodynamic Investigations of the Turbulent Coolant Flow in Nuclear Reactor Elements</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>Коновалов</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Konovalov</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Адрес для переписки: Коновалов И.А. - Нижегородский государственный технический университет, ул. Минина, 24, г. Нижний Новгород 603950e-mail: iliakonowaloff@yandex.ru</p></bio><bio xml:lang="en"><p>Address for correspondence: Konovalov I.A. – Nizhny Novgorod State Technical Univercity, Minin str., 24, Nizhny Novgorod 603950, Russia e-mail: iliakonowaloff@yandex.ru</p></bio><email xlink:type="simple">iliakonowaloff@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>Чесноков</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Chesnokov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Минина, 24, г. Нижний Новгород 603950</p></bio><bio xml:lang="en"><p>Minin str., 24, Nizhny Novgorod 603950</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Баринов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Barinov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Минина, 24, г. Нижний Новгород 603950</p></bio><bio xml:lang="en"><p>Minin str., 24, Nizhny Novgorod 603950</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дмитриев</surname><given-names>С. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Dmitriev</surname><given-names>S. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Минина, 24, г. Нижний Новгород 603950</p></bio><bio xml:lang="en"><p>Minin str., 24, Nizhny Novgorod 603950</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хробостов</surname><given-names>А. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Khrobostov</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Минина, 24, г. Нижний Новгород 603950</p></bio><bio xml:lang="en"><p>Minin str., 24, Nizhny Novgorod 603950</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Легчанов</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Legchanov</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Минина, 24, г. Нижний Новгород 603950</p></bio><bio xml:lang="en"><p>Minin str., 24, Nizhny Novgorod 603950</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бородин</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Borodin</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Минина, 24, г. Нижний Новгород 603950</p></bio><bio xml:lang="en"><p>Minin str., 24, Nizhny Novgorod 603950</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Макаров</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Makarov</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Минина, 24, г. Нижний Новгород 603950</p></bio><bio xml:lang="en"><p>Minin str., 24, Nizhny Novgorod 603950</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Нижегородский государственный технический университет имени Р.Е. Алексеева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Nizhny Novgorod State Technical Univercity n.a. R.E. Alekseev</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>19</day><month>03</month><year>2021</year></pub-date><volume>12</volume><issue>1</issue><fpage>67</fpage><lpage>74</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Коновалов И.А., Чесноков А.А., Баринов А.А., Дмитриев С.М., Хробостов А.Е., Легчанов М.А., Бородин С.С., Макаров М.А., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Коновалов И.А., Чесноков А.А., Баринов А.А., Дмитриев С.М., Хробостов А.Е., Легчанов М.А., Бородин С.С., Макаров М.А.</copyright-holder><copyright-holder xml:lang="en">Konovalov I.A., Chesnokov A.A., Barinov A.A., Dmitriev S.M., Khrobostov A.E., Legchanov M.A., Borodin S.S., Makarov M.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://pimi.bntu.by/jour/article/view/701">https://pimi.bntu.by/jour/article/view/701</self-uri><abstract><p>Корреляционный метод измерения расхода теплоносителя находит широкое применение в исследовательской практике, в том числе для изучения турбулентных потоков теплоносителя в масштабных моделях элементов ядерных энергетических установок. Целью данной работы являлась отработка методики оценки влияния шума, регистрируемого измерительной системой, на показания скорости потока, полученные с применением корреляционного метода.</p><p>Представлена методика оценки влияния шума, а также взаимного расположения и периода опроса чувствительных элементов на основе кондуктометрической измерительной системы: пространственных кондуктометров сетчатой конструкции. Незначительная концентрация раствора соли (NaCl или Na2SO4 ) используется в качестве пассивной примеси, создающей градиент проводимости среды, регистрируемый кондуктометрической системой. В качестве переносимых возмущений в работе используются турбулентные</p><p>пульсации на границе раздела двух спутных струй с одинаковыми скоростями в канале квадратного сечения. Представлены значения времени транспорта турбулентности между пространственными кондуктометрами, результаты оценки спектральной плотности мощности и ширины регистрируемого сигнала, а также полученные на их основе отношения сигнал-шум измерительной системы, в дальнейшем использованные</p><p>для оценки доверительного интервала времени транспорта.</p><p>В результате измерений получены зависимости величины доверительного интервала от времени регистрации показаний пространственных кондуктометров. Измерения, проведённые при различном взаимном расположении кондуктометров, позволяют сделать обобщающий вывод о росте спектральной ширины сигнала и, как следствие этого, уменьшение длины доверительного интервала с увеличением расстояния между датчиками.</p><p>Представленная работа является апробацией данного подхода для его применения в составе экспериментальной модели ядерного реактора с целью определения поканальных расходов в каналах имитатора активной зоны при помощи сетчатых кондуктометрических датчиков с учётом влияния шума, регистрируемого измерительной системой.</p></abstract><trans-abstract xml:lang="en"><p>The correlation method of the coolant flow measuring is widely used in research practice including for studying of turbulent coolant flows in scale models of elements of nuclear power plants. The aim of this work was to develop a technique for assessing the effect of noise recorded by a measuring system on the flow rate readings obtained using the correlation method.</p><p>A technique to assess the effect of noise as well as the relative position and acquisition period of sensors is presented. An insignificant concentration of a salt solution (NaCl or Na2SO4 ) is used as a passive impurity which creates a conductivity gradient of the medium recorded by a conductometric system. Turbulent pulsations at the interface between two concurrent isokinetic flows in a channel with a square cross section are used as the signal source for the correlational algorithm.</p><p>Paper presents the values of  the  turbulence′s  transport  time  between  spatial  conductometers, the results of estimating the spectral power density and band of the recorded signal and also the signalto-noise ratios of the measuring system obtained on their basis which are subsequently used to estimate the confidence interval of the transport time.</p><p>As a result of measurements the relationship between the confidence  interval  value  and  the signal length were obtained. The measurements which were carried out at different relative positions of conductometers make it  possible  to  make  a  conclusion  about  an  increase  in  the  spectral  width of the signal and, as a consequence, a decrease in the length of the confidence interval with increasing of distance between sensors.</p><p>The presented work is an approbation of this approach for its application as part of an experimental model of a nuclear reactor in order to determine per-channel flow rates in the channels of the core simulator using mesh conductometric sensors taking into account the effect of noise.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>пространственная кондуктометрия</kwd><kwd>сетчатый датчик</kwd><kwd>кондуктометрический датчик</kwd><kwd>моделирование процессов в ЯЭУ</kwd></kwd-group><kwd-group xml:lang="en"><kwd>spatial conductometry</kwd><kwd>wire mesh sensor</kwd><kwd>modeling of processes in the elements of nuclear power units</kwd></kwd-group><funding-group><funding-statement xml:lang="en">Developing and approbation of method of correlation velocity  measurements  for  the  turbulent fl with conductometric measurement system was funded by the grant of Russian Science Foundation (project No. 18-19-00473).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Rohde U., Kliem S., Hemstrom B., Toppila T., Bezrukov Y. 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