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Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v20.i1.50
pages 57-70

EXPERIMENTAL INVESTIGATION OF THE CORRELATION BETWEEN NOZZLE FLOW AND SPRAY USING LASER DOPPLER VELOCIMETER, PHASE DOPPLER SYSTEM, HIGH-SPEED PHOTOGRAPHY, AND X-RAY RADIOGRAPHY

Benjamin Balewski
Robert Bosch GmbH
Barbara Heine
Robert Bosch GmbH, Corporate Research, Postfach 10 60 50, D-70049 Stuttgart
Cameron Tropea
Technische Universität Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Center of Smart Interfaces, International Research Training Group Darmstadt-Tokyo on Mathematical Fluid Dynamics, Germany

RESUMO

This paper presents experimental investigations of the nozzle flow and spray in a pressure atomizer. Different inlays in the nozzle were used to modify the nozzle flow. To isolate the influence of turbulence and cross-flow velocity on the primary atomization, an operating point without cavitation in the nozzle was selected. This was monitored using a high-speed camera in combination with a long-distance microscope. Inside the transparent nozzle, a two-velocity component laser Doppler velocimeter (LDV) was used to measure velocity and turbulence profiles at the nozzle exit. For the characterization of the spray, different measurement techniques have been applied: high-speed photography to determine the spray angle, a phase Doppler system (PDA) for the velocity distribution and droplet sizes in the spray, and X-ray radiography for the spray angle and to evaluate the liquid density distribution. Finally, the correlations between the flow characteristics in the nozzle and the spray characteristics are discussed using the experimental results.


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