NDLI: Spray characteristics of a gasoline direct injector injector with short durations of injection

Content Provider	Springer Nature Link
Author	uri, J. M. Whitelaw, J. H.
Copyright Year	2001
Abstract	The sprays into atmosphere from a GDI injector were visualised and the velocity and droplet characteristics measured at an injection pressure of 50 bar and at different injection durations, with emphasis on short injection periods. The images show that the initial and closing delay times were 0.225 and 0.2 ms, respectively, and that the cone angle increased with injection duration to a constant value of 62° at 0.5 ms. They also revealed large droplets ahead of the main spray with its smaller droplets. An injection duration of 0.15 ms led to fuel leaving the injector with little atomisation, but a 30% increase led to the formation of the cone, which was present for times greater than 0.5 ms. The poor atomisation associated with short injection durations and the initial phase of longer injections, was due to low swirl velocities. The droplet velocities were higher in the initial phase of injection than in the main phase, with values up to 50 m/s. The Sauter mean diameters of the initial and main-spray droplets were approximately 55 and 35 μm respectively and with a tendency to decrease with time from the start of injection.
Starting Page	377
Ending Page	383
Page Count	7
File Format	PDF
ISSN	07234864
Journal	Experiments in Fluids
Volume Number	31
Issue Number	4
e-ISSN	14321114
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-10-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Physics and Astronomy Mechanics of Materials Computational Mechanics

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