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Atomization and Sprays
IF: 1.737 5-Year IF: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 2.2

ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2017021033
pages 791-805

MICROSCOPIC ANALYSIS OF TRANSVERSAL AND AZIMUTHAL SURFACE DISTURBANCES OF HIGH-PRESSURE SPRAYS

Valeri Kirsch
Institute of Heat and Mass Transfer, RWTH Aachen University, Augustinerbach 6, 52056 Aachen, Germany
Manuel Armin Reddemann
Institute of Heat and Mass Transfer, RWTH Aachen University, Augustinerbach 6, 52056 Aachen, Germany
Johannes Palmer
Institute of Heat and Mass Transfer, RWTH Aachen University, Augustinerbach 6, 52056 Aachen, Germany
Reinhold Kneer
Institute of Heat and Mass Transfer, RWTH Aachen University, Augustinerbach 6, 52062 Aachen, Germany

ABSTRACT

A microscopic system, consisting of a transmitted light microscope and constant-pressure flow vessel, is specifically designed to enable highly resolved high-pressure primary breakup investigations at engine-like densities. At first measurements diesel and two alternative fuels are injected with a standard diesel injector at different ambient pressures. Reynolds and Ohnesorge number are varied over a wide range and several individual mechanisms are identified: an asymmetric outlet flow, the formation of sheets, ligaments, and droplets, and finally the growth of azimuthal and transversal surface disturbances. Wavelength magnitudes of transversal disturbances are in good agreement with existing analytical theories of boundary layer instabilities. Azimuthal disturbances are associated with nozzle internal cavitation. For the given high Weber number azimuthal disturbances are mainly responsible for the overall shape and subsequent breakup of the jet core.


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