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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

Выпуски:
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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v15.i4.10
pages 275-300

VORTICAL STRUCTURES ANALYSIS IN JET FLOWS USING A CLASSICAL 2D-PIV SYSTEM AND TIME RESOLVED VISUALIZATION IMAGE PROCESSING

Ilinca Nastase
CAMBI Research Center, Technical University of Civil Engineering in Bucharest, Building Services Faculty, Avenue Pache Protopescu 66, Bucharest, Romania
Amina Meslem
LaSIE, University of La Rochelle Pole Sciences et Technologie La Rochelle, France
Thierry Bouwmans
Laboratoire Mathématiques, Images et Applications, University of La Rochelle, France

Краткое описание

An optical field measurement technique and a high-speed visualization technique enriched by a low-level image processing are associated in the vortex dynamics analysis of the near field of jet flows. In a round jet the entrainment is produced in the braid regions being interrupted in the presence of the Kelvin-Helmholtz ring. The latter crush the streamwise vortices altering their self-induction role. Conversely, a lobed cross-shaped orifice geometry allows a cutting of the Kelvin-Helmholtz structures into discontinuous ring segments. Consequently, streamwise large-scale structures are developing in these discontinuity regions. The streamwise structures control and enhance the jet entrainment which is not altered by the Kelvin−Helmholtz structures passing.


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