Influence of nozzle hole eccentricity on spray morphology
Loading...
Author (Corporation)
Publication date
2013
Typ of student thesis
Course of study
Collections
Type
04B - Conference paper
Editors
Editor (Corporation)
Supervisor
Parent work
Special issue
DOI of the original publication
Link
Series
Series number
Volume
Issue / Number
Pages / Duration
517-524
Patent number
Publisher / Publishing institution
Place of publication / Event location
Chania
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
Large marine two-stroke diesel engines have an injector geometry, which differs substantially from the configurations used in most other diesel engine applications, as the injector orifices are distributed in a highly non-symmetric fashion. In order to experimentally assess the impact of key features of such orifice arrangements on spray morphology, orifice eccentricity relative to the injector axis in particular, a dedicated test setup has been realised, including the development and application of tailor-made data processing routines. The high-speed camera recordings of the Mie-scattering data obtained simultaneously for two perpendicular views of single sample sprays have been analysed in terms of spray tip penetration and spray angle as well as with respect to the orientation of the spray. These analyses confirm the complex three-dimensional structure of sprays at such conditions: They are in fact far from rotationally symmetric – specifically when high levels of eccentricity apply – and the actual orientation of their axis in such cases clearly deviates from the nominal one, normally assumed to be in line with the orifice axis. These deflections are in the range of 10° and they apply not only in the direction of the eccentricity but also perpendicular to it. Additional effects arise from the geometric configuration of the central bore of the injector, upstream of the orifice, and when varying the injection pressure.In the case of high eccentricity, moreover, a clear pattern can be discerned in the initial evolution of the spray deflection: Starting from a slight deflection in the direction of the eccentricity, the spray axis moves first to its nominal direction and then gradually changes orientation again towards the level of stabilisation.
Keywords
Event
ILASS – Europe 2013, 25th European Confernece on Liquid Atomization and Spray Systems
Exhibition start date
Exhibition end date
Conference start date
01.09.2013
Conference end date
04.09.2013
Date of the last check
ISBN
978-960-7365-30-9
ISSN
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
Review
No peer review
Open access category
Closed
License
Citation
Schmid, A., von Rotz, B., Schulz, R., Herrmann, K., Weisser, G., & Bombach, R. (2013). Influence of nozzle hole eccentricity on spray morphology (M. Gavaises, Ed.; pp. 517–524). https://irf.fhnw.ch/handle/11654/51891