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Atomization and Sprays
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ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v19.i11.10
pages 997-1012

NEAR-WALL CHARACTERISTICS OF AN IMPINGING GASOLINE SPRAY AT INCREASED AMBIENT PRESSURE AND WALL TEMPERATURE

Jochen Stratmann
Institute of Heat and Mass Transfer, RWTH Aachen University, Germany
D. Martin
Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstr. 18, 52062 Aachen, Germany
P. Unterlechner
Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstr. 18, 52062 Aachen, Germany
Reinhold Kneer
Institute of Heat and Mass Transfer, RWTH Aachen University, Augustinerbach 6, 52062 Aachen, Germany

RÉSUMÉ

With a focus on the direct-injection gasoline (GDI) engine, this work provides near-wall spray details of the liquid phase of an impinging fuel spray at GDI engine conditions. The experiments are conducted in a constant volume pressure chamber at elevated gas pressure (pgas = 0.6 and 1.5 MPa), increased gas temperature (Tgas = 500 K), and variable wall temperature (Tw = 400 and 575 K). Using phase-Doppler anemometry, temporally and spatially resolved mean droplet sizes and velocity components are determined at distances from 0.2 to 1.0 mm above the surface. The transient behavior of the wall jet, which develops along the surface, is resolved by the measurements. The formation of a vortex at the front of this jet is observed. At its tip, large mean droplet diameters are observed that coincide with a rapid change of the wall-normal velocity. An increasing wall temperature causes the tip of the wall jet to propagate slower along the wall, which is apparently caused by a change in the local density of the gas above the surface.


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