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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.2018025956
pages 837-856

INTERPLUME VELOCITY AND EXTINCTION IMAGING MEASUREMENTS TO UNDERSTAND SPRAY COLLAPSE WHEN VARYING INJECTION DURATION OR NUMBER OF INJECTIONS

Panos Sphicas
Mechanical Engineering Department, Prince Mohammad Bin Fahd University, P.O. Box 1664, Al Khobar 31952, Saudi Arabia
Lyle M. Pickett
Combustion Research Facility, Sandia National Laboratories, P.O. Box 696, Livermore, CA 94551
S. A. Skeen
Combustion Research Facility, Sandia National Laboratories, P.O. Box 696, Livermore, CA 94551
J. H. Frank
Combustion Research Facility, Sandia National Laboratories, P.O. Box 696, Livermore, CA 94551
S. Parrish
General Motors Global Research & Development, Detroit, MI

RESUMO

The collapse or merging of individual plumes of direct-injection gasoline injectors is of fundamental importance to engine performance because of its impact on fuel–air mixing. However, the mechanisms of spray collapse are not fully understood. The purpose of this work is to study the effects of injection duration and multiple injections on the interaction and/or collapse of multiplume gasoline direct injection sprays. High-speed (100 kHz) particle image velocimetry is applied along a plane between plumes to observe the full temporal evolution of plume interaction and potential collapse, resolved for individual injection events. Supporting information along a line of sight is obtained using diffused back illumination. Experiments are performed under simulated engine conditions using a symmetric 8-hole injector in a high-temperature, high-pressure vessel at the "Spray G" operating conditions of the Engine Combustion Network. Longer injection duration is found to promote plume collapse, while staging fuel delivery with multiple, shorter injections is resistant to plume collapse.