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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v2.i1.50
pages 61-74

FLOW VISUALIZATION METHODS FOR INVESTIGATING AN INDUCED FLOW EJECTOR

Philippe Desevaux
Institut FEMTO-ST-UMR 6174, Département Energie, Université de Franche-Comté, Parc Technologique, Belfort, France
Jean-Pierre Prenel
University of Franche Comte/CNRS 6174, Belfort, France
G. Hostache
Institut de Génie Energétique, Université de Franche-Comté Parc Technologique, 90000 Belfort, France

ABSTRACT

This report presents an optical diagnosis of the interaction of two coflowing streams inside an air ejector operating in a mixed flow condition. The visualization techniques used are based on Rayleigh and Mie scatterings. They differ from each other by the kind of the illumination source (pulsed or continuous laser), the polarization state of the incident light, and the nature of the seeding. Each method permits the visualization of specific phenomena, and by combining together all these techniques, it is possible to visualize the primary pseudo-shock structure, the nonmixing region, and the instantaneous turbulent structures of the flow. Issues related to the effects of various operating conditions on the flow pattern are addressed by these visualization methods.