Ejector device for direct injection fuel jet

Patent · 30 May 2006

OSTI ID:908409

Upatnieks, Ansis ^[1]

---

1. Livermore, CA

Disclosed is a device for increasing entrainment and mixing in an air/fuel zone of a direct fuel injection system. The device comprises an ejector nozzle in the form of an inverted funnel whose central axis is aligned along the central axis of a fuel injector jet and whose narrow end is placed just above the jet outlet. It is found that effective ejector performance is achieved when the ejector geometry is adjusted such that it comprises a funnel whose interior surface diverges about 7.degree. to about 9.degree. away from the funnel central axis, wherein the funnel inlet diameter is about 2 to about 3 times the diameter of the injected fuel plume as the fuel plume reaches the ejector inlet, and wherein the funnel length equal to about 1 to about 4 times the ejector inlet diameter. Moreover, the ejector is most effectively disposed at a separation distance away from the fuel jet equal to about 1 to about 2 time the ejector inlet diameter.

• Research Organization: Sandia National Laboratories (SNL-CA), Livermore, CA
• Sponsoring Organization: United States Department of Energy
• DOE Contract Number: AC04-94AL85000
• Assignee: Sandia Naitonal Laboratories (Livermore, CA)
• Patent Number(s): 7,051,956
• Application Number: 10/804,949
• OSTI ID: 908409
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING