Liquid and Vapor Fuel Distributions from an Air-Assist Injector - An Experimental and Computational Study General Motors Research Labs

Format:

Conference/Event

Author/Creator:

Diwakar, R., author.

Conference Name:

International Congress & Exposition (1992-02-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1992

Summary:

Air-assist fuel sprays have been investigated experimentally with exciplex laser-induced fluorescence visualization and computationally with the KIVA-3 code. The exciplex-fluorescence technique provided simultaneous but distinct cross-sectional images of the liquid and vapor fuel distributions under simulated light-load conditions in both an atmospheric-pressure test rig and in a motored two-stroke engine. The computations resolved the flow through the injector passages upstream of and around the poppet, and included the effects of aerodynamic drop breakup, drop collisions and vaporization. Both the measurements and the calculations show that the fuel initially emerges from the injector as a hollow-cone jet. This two-phase jet collapses downstream as entrainment of air produces a low-pressure region beneath the poppet. Highly stratified fuel-air distributions with steep vapor-concentration gradients are found for injection and ignition timings typical of light-load operation of a direct-injection two-stroke-cycle engine

Notes:

Vendor supplied data

Publisher Number:

920422

Access Restriction:

Restricted for use by site license