Bouncing of the diesel injector needle at the closing stage

An experiment has been performed to examine the phenomenon of the after-injection (secondary injection) of diesel fuel at the closing stage of needle motion in a single-spring diesel injector. A simplified analytical model has been proposed to describe needle bouncing. Needle bouncing was confirmed by spray visualization to be the primary cause of after-injection. The needle motion was well simulated by the proposed model. A series of parametric studies have been performed to find the effects of injector design parameters and operating conditions. Needle bouncing becomes small with a larger damping force by fluid shear at the needle surface. It can also be reduced by decreasing the material stiffness and installation displacement of the needle spring, the equivalent stiffness of the needle seat and the injector body and the maximum needle lift. The possibility of optimizing the injector design to reduce after-injection is discussed.
Publisher
PROFESSIONAL ENGINEERING PUBLISHING LTD
Issue Date
2002
Language
ENG
Keywords

single-spring diesel injector; after-injection; secondary injection; needle bouncing; simplified analytical model

Citation

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING, v.216, no.D8, pp.691-700

ISSN
0954-4070
URI
http://hdl.handle.net/10203/13176
Appears in Collection
ME-Journal Papers(저널논문)
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