US 7,533,532 B1
Fuel injection
Ian J Toon, Leicester (United Kingdom); Gary Eadon, Hinckley (United Kingdom); Andrew C Graham, Coventry (United Kingdom); and Allan J Salt, Nuneaton (United Kingdom)
Assigned to Rolls-Royce plc, London (United Kingdom)
Filed on May 08, 2006, as Appl. No. 11/429,232.
Claims priority of application No. 0318605.3 (GB), filed on Aug. 08, 2003.
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 1/00 (2006.01); F02G 3/00 (2006.01)
U.S. Cl. 60—740  [60/39.463] 22 Claims
OG exemplary drawing
 
1. A method of injecting fuel comprising a fuel injection arrangement including gas fuel injection means to present gaseous fuel and liquid fuel injection means to present liquid fuel to a combustor having an inlet, the arrangement characterised in that the liquid fuel injection means incorporates an injection conduit including an outlet for an airflow and a liquid fuel jet presented at a high angle relative to the air flow; the method comprising the steps of,
entraining and atomizing by the air flow at low fuel injection rates the liquid fuel expelled by the liquid fuel jet without impinging upon the injection conduit and
at high fuel injection rates the liquid fuel being expelled by the liquid fuel jet impinging upon the injection conduit to form a wash film atomised by the air flow, so that entrained and/or atomised liquid fuel is interchangeable with gas fuel presented through the gas fuel injection means.