Structure of sprays generated by pressure swirl injectors for direct-injection gasoline engines

E Abo-Serie, C Arcoumanis, M Gavaises, B Argueyrolles, F Galzin

Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review


The transient spray generated by a high pressure swirl injector, used in emerging direct-injection gasoline engines, was visualised under atmospheric conditions by a high magnification and resolution CCD-based imaging system. Following a delay period between signal initiation and first appearance of fuel at the nozzle exit, four stages have been identified during the spray development: a very early asymmetric poorly atomised jet penetrating in the central part of the nozzle hole with a tip velocity proportional to injection pressure, an asymmetric non-hollow spray, a swirl-developing hollow-cone spray with a multi-layer structure, and a fully-developed and well atomised hollow-cone spray with a cone angle nearly independent of injection pressure. The first two stages correspond to the period before the liquid film is formed in the nozzle hole and the last two to the period of film development. Due to the transient nature of the spray and its varying structure with time it has been necessary to estimate the penetration of the spray in two different ways; in terms of its leading edge during the first two stages and in terms of the distance to its maximum width at the last two. High magnification images of the annular liquid sheet at the nozzle exit also revealed the co-existence of two modes of droplet formation, through ligaments in the direction of injection and through wave crest stripping in the radial direction
Original languageEnglish
Title of host publication14th Annual Conference on Liquid Atomization and Spray Systems (ILASS-Europe)
PublisherInstitute for liquid atomization and spray systems - ILASS
Number of pages3
Publication statusPublished - 1999
EventILASS Europe 99 - Toulouse , France
Duration: 5 Jul 19997 Jul 1999
Conference number: 14


ConferenceILASS Europe 99


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