Injection nozzle tip cooling

A dual fuel injection nozzle having a central axis, comprising:

• an outer casing coaxially positioned about the central axis;
• a combustor end being attached to the outer casing and having a combustor face and a back face, said combustor face being generally perpendicular to said central axis;
• a member being attached within the outer casing forming a chamber therebetween with the chamber being in fluid communication with a source of gaseous fuel;
• an annular groove positioned in said member and being in fluid communication with a source of liquid fuel;
• an air chamber being formed between said combustor end and said member and being in fluid communication with a source of compressed air;
• and,
• a plurality of openings being formed in the combustor end between the combustor face and the back face and communicating with the compressed air in the air chamber, said plurality of openings being at an acute angle to the combustor face and being radially spaced about the central axis, such that a plurality of base circles are formed, in which a portion of said plurality of openings which are disposed along said plurality of base circles are tangent to their respective base circle, such that compressed air discharged therefrom initially flows in a direction tangent to their respective base circle at said acute angle to the combustor face.