Determination of the parameters of an axial pico-hydroturbine for various operating regimes

S. I. Shtork; I. V. Litvinov; E. Yu Gorelikov; D. A. Suslov

doi:10.1134/S0869864321040144

Determination of the parameters of an axial pico-hydroturbine for various operating regimes

Переведенное название: Определение параметров осевой пикогидротурбины для различных режимов работы

S. I. Shtork, I. V. Litvinov, E. Yu Gorelikov, D. A. Suslov

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

Аннотация

В статье представлены результаты детальных экспериментальных исследований характеристик течения за рабочим колесом модельной пикогидротурбины пропеллерного типа с диаметром рабочего колеса 0,1 м. С использованием автоматизированной системы лазерно-доплеровский анемометр проведены измерения распределений двух компонент осредненных скоростей и пульсаций для условий от частичной нагрузки до сильной перегрузки. Показано, что при смещении режима работы гидротурбины от оптимального поток на выходе из рабочего колеса становится закрученным. На основе полученных данных выявлен характер эволюции интегрального параметра крутки, который определяет состояние закрученного потока. Обнаружен тренд резкого увеличения параметра крутки при уменьшении расхода воздуха, вследствие чего степень закрутки быстро достигает критического уровня, при котором происходит распад вихря с развитием центрального провала на профиле осевой скорости и оттеснением потока к стенкам канала. При увеличении расхода имеет место замедленный рост параметра крутки, который остается меньше порогового значения даже для большой перегрузки. Вследствие этого максимумы тангенциальной скорости располагаются вблизи оси потока, а профиль аксиальной скорости остается равномерным по сечению потока. Информация об особенностях течения может быть использована при настройке режима гидроагрегата на оптимальные условия и разработке рекомендаций для расширения диапазона регулирования работы гидротурбины с сохранением высокой эффективности.

Переведенное название	Определение параметров осевой пикогидротурбины для различных режимов работы
Язык оригинала	английский
Номер статьи	14
Страницы (с-по)	599-602
Число страниц	4
Журнал	Thermophysics and Aeromechanics
Том	28
Номер выпуска	4
DOI	https://doi.org/10.1134/S0869864321040144
Состояние	Опубликовано - июл 2021

Предметные области OECD FOS+WOS

2.03 МЕХАНИКА И МАШИНОСТРОЕНИЕ
2.03.DT ТЕРМОДИНАМИКА

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@article{9a22826ba955436b98343e1ef9e9c4b9,

title = "Determination of the parameters of an axial pico-hydroturbine for various operating regimes",

abstract = "The paper presents the results of detailed experimental studies of the flow characteristics behind the impeller of an air model of a propeller-type pico-hydroturbine with an impeller diameter of 0.1 m. Using the method of laser-Doppler anemometry, distributions of two components of averaged velocities and pulsations were measured under the conditions varying from partial load to severe overload. It is shown that when the regime of hydroturbine operating deviates from the optimal one, the flow at the impeller outlet becomes swirling. Based on the data obtained, the character of evolution of the integral swirling parameter, which determines the swirling flow state, has been revealed. A trend for a sharp increase in the swirling parameter with a decrease in the air flow rate was found. Due to this increase, the degree of swirling reaches quickly a critical level at which the vortex disintegrates with the development of a central dip in the axial velocity profile and displacement of the flow to the channel walls. With an increase in the flow rate, a slower increase in the swirling parameter takes place, which remains below the threshold value even for a large overload. As a result, the maxima of the tangential velocity are located near the flow axis, and the profile of the axial velocity remains uniform over the flow cross section. Information about the flow characteristics can be used when adjusting the hydraulic unit regime to optimal conditions and developing recommendations for expanding the range of regulation of the hydroturbine operation while maintaining high efficiency.",

keywords = "axial turbine, hydroturbine efficiency, laser Doppler anemometer (LDA), pico-hydroturbine, swirling parameter",

author = "Shtork, {S. I.} and Litvinov, {I. V.} and Gorelikov, {E. Yu} and Suslov, {D. A.}",

note = "This work, including measurements of velocity fields and data analysis, was carried out with state support for scientific research conducted under the guidance of leading scientists in Russian universities (Agreement No. 075-15-20191923). As regards the design and installation of the experimental setup, the work was carried out within the framework of the state assignment to the IT SB RAS. Publisher Copyright: {\textcopyright} 2021, S.I. Shtork, I.V. Litvinov, E.Yu. Gorelikov, and D.A. Suslov.",

year = "2021",

month = jul,

doi = "10.1134/S0869864321040144",

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Determination of the parameters of an axial pico-hydroturbine for various operating regimes. / Shtork, S. I.; Litvinov, I. V.; Gorelikov, E. Yu ; Suslov, D. A.

В: Thermophysics and Aeromechanics, Том 28, № 4, 14, 07.2021, стр. 599-602.

Результат исследования: Научные публикации в периодических изданиях › статья › рецензирование

TY - JOUR

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AU - Litvinov, I. V.

AU - Gorelikov, E. Yu

AU - Suslov, D. A.

N1 - This work, including measurements of velocity fields and data analysis, was carried out with state support for scientific research conducted under the guidance of leading scientists in Russian universities (Agreement No. 075-15-20191923). As regards the design and installation of the experimental setup, the work was carried out within the framework of the state assignment to the IT SB RAS. Publisher Copyright: © 2021, S.I. Shtork, I.V. Litvinov, E.Yu. Gorelikov, and D.A. Suslov.

PY - 2021/7

Y1 - 2021/7

N2 - The paper presents the results of detailed experimental studies of the flow characteristics behind the impeller of an air model of a propeller-type pico-hydroturbine with an impeller diameter of 0.1 m. Using the method of laser-Doppler anemometry, distributions of two components of averaged velocities and pulsations were measured under the conditions varying from partial load to severe overload. It is shown that when the regime of hydroturbine operating deviates from the optimal one, the flow at the impeller outlet becomes swirling. Based on the data obtained, the character of evolution of the integral swirling parameter, which determines the swirling flow state, has been revealed. A trend for a sharp increase in the swirling parameter with a decrease in the air flow rate was found. Due to this increase, the degree of swirling reaches quickly a critical level at which the vortex disintegrates with the development of a central dip in the axial velocity profile and displacement of the flow to the channel walls. With an increase in the flow rate, a slower increase in the swirling parameter takes place, which remains below the threshold value even for a large overload. As a result, the maxima of the tangential velocity are located near the flow axis, and the profile of the axial velocity remains uniform over the flow cross section. Information about the flow characteristics can be used when adjusting the hydraulic unit regime to optimal conditions and developing recommendations for expanding the range of regulation of the hydroturbine operation while maintaining high efficiency.

AB - The paper presents the results of detailed experimental studies of the flow characteristics behind the impeller of an air model of a propeller-type pico-hydroturbine with an impeller diameter of 0.1 m. Using the method of laser-Doppler anemometry, distributions of two components of averaged velocities and pulsations were measured under the conditions varying from partial load to severe overload. It is shown that when the regime of hydroturbine operating deviates from the optimal one, the flow at the impeller outlet becomes swirling. Based on the data obtained, the character of evolution of the integral swirling parameter, which determines the swirling flow state, has been revealed. A trend for a sharp increase in the swirling parameter with a decrease in the air flow rate was found. Due to this increase, the degree of swirling reaches quickly a critical level at which the vortex disintegrates with the development of a central dip in the axial velocity profile and displacement of the flow to the channel walls. With an increase in the flow rate, a slower increase in the swirling parameter takes place, which remains below the threshold value even for a large overload. As a result, the maxima of the tangential velocity are located near the flow axis, and the profile of the axial velocity remains uniform over the flow cross section. Information about the flow characteristics can be used when adjusting the hydraulic unit regime to optimal conditions and developing recommendations for expanding the range of regulation of the hydroturbine operation while maintaining high efficiency.

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KW - hydroturbine efficiency

KW - laser Doppler anemometer (LDA)

KW - pico-hydroturbine

KW - swirling parameter

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