Identification and Characterization of Steady Spray Conditions in Convergent, Single-Hole Diesel Injectors

Mitra, Peetak; Matusik, Katarzyna E.; Duke, Daniel J.; Srivastava, Priyesh; Yasutomi, Koji; Manin, Julien; Pickett, Lyle M.; Powell, Christopher F.; Arienti, Marco; Baldwin, E.; Senecal, P. K.; Schmidt, David P.

doi:10.4271/2019-01-0281

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…Real-size exact replicas of Diesel nozzles made from transparent (e.g. acrylic) materials have been successfully manufactured, able to withstand pressures of the order of 1000 bar 1 . Parallel to those activities, several studies have focused on illustrating the in-nozzle, two-phase flow topology in transparent, enlarged replicas at lower injection pressures (see selectively [2][3][4].…”

Section: Flow Topologymentioning

confidence: 99%

Multiphase Phenomena in Diesel Fuel Injection Systems

Karathanassis

Koukouvinis

Gavaises

2019

Energy, Environment, and Sustainability

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Section: Flow Topologymentioning

confidence: 99%

Multiphase Phenomena in Diesel Fuel Injection Systems

Karathanassis

Koukouvinis

Gavaises

2019

Energy, Environment, and Sustainability

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“…The flow was not quite steady at low needle lift and induced high vorticity in the nozzle. 50 Komada et al 51 studied the axial transient need motion effect on the flow and spray through an outward opening injector under dry and wet conditions. It was reported that the breakup process of spray was slow at the initial needle opening stage and the spray passage contracted in closing stages, leading to the increase of turbulence flow and injection velocity.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the in sac cavitating flow for diesel spray with split injection strategy

Liu

Wang

et al. 2020

International Journal of Engine Research

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IC engines consume a large amount of fuel and produce plenty of emissions, thus reducing fuel consumption, and emissions are important. Nozzle internal flow which dominates spray breakup is the key to improve spray atomization and reduce fuel consumption. In this study, microscopic imaging technique was employed to investigate the effects of needle oscillation and injection strategy on the nozzle internal flow under cold (20°C) and hot (140°C) conditions. Needle oscillation was found to affect spray morphology, leading to obvious spray asymmetry under both cold and hot conditions with stronger spray radial propagation under hot condition. Cavitation in the sac appeared when needle oscillated due to enhanced turbulence. Besides, cavitation in the sac was introduced when the needle was insufficiently open due to throttling, especially under hot condition because of reduced viscosity. By contrast, when the split-injection strategy was employed, cavitation was considerably boosted because of the consistent flow transition and the resultant throttling effect. Effective injection duration of the first injection governed the corresponding peak relative cavitation area. The appearance of cavitation was delayed during the initial stage for each split injection after the fuel flows out due to laminar flow regime.

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