年間 4 号発行
ISSN 印刷: 1065-3090
ISSN オンライン: 1940-4336
Indexed in
VORTICAL STRUCTURES ANALYSIS IN JET FLOWS USING A CLASSICAL 2D-PIV SYSTEM AND TIME RESOLVED VISUALIZATION IMAGE PROCESSING
要約
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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El Hassan Mouhammad, Meslem Amina, Time-resolved stereoscopic particle image velocimetry investigation of the entrainment in the near field of circular and daisy-shaped orifice jets, Physics of Fluids, 22, 3, 2010. Crossref
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