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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v8.i4.50
14 pages

LASER DIAGNOSTICS OF TRANSVERSE TURBULENT JETS

V. Sivadas
Department of Mechanical Engineering, Institute Superior Tecnico, Av.Rovisco Pais, 1049-001, Lisbon, Portugal
B. S. Pani
Department of Civil Engineering, Indian Institute of Technology, Bombay-400 076, India
K. A. Butefisch
Institute of Fluidmechanics, DLR, D-37073, Gottingen, Germany

RESUMO

Experiments were conducted in a low-speed wind tunnel to understand the influence of nozzle geometry on the flow characteristics of incompressible air jets injected normal to a free stream. Jets issuing from circular and noncircular nozzles, with exit Reynolds numbers in the range 4500-9200 and velocity ratios from 3.8 to 7.7 are investigated. Measurements, in the zone of established flow, were carried out by laser light sheet flow visualization coupled with image processing, and laser Doppler anemometer techniques. Results show that, with increasing aspect ratio of the nozzles, the jet penetration increases and carries stronger bound vortex pairs compared with the circular case. The deflected circular and square jets exhibit similar flow characteristics.


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