nguphysСибирский физический журналSIBERIAN JOURNAL OF PHYSICS2541-9447Новосибирский государственный университет10.25205/2541-9447-2018-13-4-46-59nguphys-63Research ArticleФИЗИКА ЖИДКОСТИ, НЕЙТРАЛЬНЫХ И ИОНИЗОВАННЫХ ГАЗОВPHYSICS OF A FLUID, NEUTRAL AND IONIZED GASESАнализ когерентных структур в осесимметричной и шевронной струяхAnalysis of Coherent Structures in Circular and Chevron JetsАбдуракиповС. С.AbdurakipovS. S.s.s.abdurakipov@gmail.comДулинВ. М.DulinV. M.vmd@itp.nsc.ruТокаревМ. П.TokarevM. P.mtokarev@itp.nsc.ruМарковичД. М.MarkovichD. M.dmark@itp.nsc.ruИнститут теплофизики им. С. С. Кутателадзе СО РАН; Новосибирский государственный университетРоссияInstitute of Thermophysics SB RAS; Novosibirsk State University NovosibirskRussian Federation2018261020201344659Copyright © Абдуракипов С.С., Дулин В.М., Токарев М.П., Маркович Д.М., 20202020Абдуракипов С.С., Дулин В.М., Токарев М.П., Маркович Д.М.Abdurakipov S.S., Dulin V.M., Tokarev M.P., Markovich D.M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nguphys.elpub.ru/jour/article/view/63

Работа посвящена анализу пространственной формы и динамики когерентных вихревых структур в осесимметричной и шевронной затопленных струях. Томографическая PIV-система использовалась для измерений 3D-распределений скорости c частотой съемки 2 кГц. Массив данных о поле скорости был проанализирован с применением пространственного преобразования Фурье по азимутальному углу и статистического метода POD (Proper Orthogonal Decomposition). Показано, что для шевронной струи кинетическая энергия пульсаций осесимметричной моды m = 0, связанная с кольцевыми вихрями в слое смешения струи, в два раза меньше по сравнению со струей из круглого сопла.

The present study reports on measurements of the spatial shape and dynamics of large-scale coherent structures in circular and chevron submerged jets by the volumetric particle image velocimetry technique. A tomographic PIV system was used for the measurements of 3D velocity fields with 2 kHz acquisition rate. The datasets of PIV velocity fields were analyzed by spatial Fourier transform over the azimuthal angle and proper orthogonal decomposition (POD). It was concluded that for the chevron jet the turbulent kinetic energy of the axisymmetric mode m = 0, related with ring-like vortices in mixing layer of the jet, was more than twice smaller in comparison with the jet from a circular nozzle.

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The authors declare that there are no conflicts of interest present.