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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN 印刷: 1065-3090
ISSN オンライン: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v14.i2.10
pages 143-154

EVOLUTION OF VORTICAL STRUCTURES IN INDETERMINATE-ORIGIN NOZZLE JETS

Fangjun Shu
Department of Mechanical and Aerospace Engineering New Mexico State University MSC 3450, P.O. Box 30001, Las Cruces, NM 88003-8001
Michael W. Plesniak
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA; Department of Mechanical and Aerospace Engineering The George Washington University
Paul E. Sojka
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, 47907-2014, USA

要約

Passive jet control is achieved by using nozzles of indeterminate origin (IO), i.e., nozzles, which are jagged or non-uniform around their circumference. The structure and flow field of round jets of water were studied using the Laser Induced Fluorescence (LIF) technique. Typical jet Reynolds numbers (based on the nozzle diameter and bulk velocity) are 5000− 10,000. The jet structures for IO nozzles are compared to those produced by conventional round nozzles. The IO nozzles introduce strong streamwise vortex pairs, which influence the near-jet structure and spreading by deforming the primary spanwise (Kelvin−Helmholtz) vortex rings. The valleys of the IO nozzle entrain ambient fluid into the jet and generate incursion streamwise vortex pairs, which penetrate into the jet core. After reorganization, excursion streamwise vortex pairs transport jet fluid into the surrounding fluid at peak locations. The evolution of these structures with streamwise distance and their implications are discussed.


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