Apparatus for injecting a fuel-air mixture into a combustion chamber

An apparatus for injecting a fuel/air mixture into a combustion chamber comprising:

• a fuel lance having a lance tip, a central inner tube, middle and outer tubes arranged concentrically with respect to the inner tube, and an insert disposed along a central axis of the fuel lance proximate the lance tip;
• wherein opposing walls of the inner and middle tubes proximate the lance tip form a substantially hollow, cylindrical, first duct portion;
• wherein an inner wall of the inner tube proximate the lance tip and the insert are configured and dimensioned to together provide a second duct portion directed slightly radially outward forming a truncated circular cone which opens out toward the lance tip;
• and
• wherein an inner wall of the outer tube proximate the lance tip is configured and dimensioned to provide a third duct portion directed slightly radially inward toward the central axis.