Patent ID: 8539773

Claim:
A fuel injection nozzle comprising; a plurality of fuel/air mixing tubes configured as a bundle of tubes, each of said tubes including an outer tube wall extending axially along a tube axis between an inlet end and an exit end, said outer tube wall having a thickness extending between an inner tube surface having an inner diameter and an outer tube surface having an outer tube diameter; each of said tubes including at least one fuel injection hole having a fuel injection hole diameter extending through said outer tube wall, at a location between said inlet end and said exit end, said fuel injection hole having an injection angle relative to said tube axis, said injection angle being in the range of about 30 to about 80 degrees to reduce flame holding and flash back from a highly reactive gaseous fuel entering the fuel injection nozzle, said inner diameter of said inner tube surface being from about 4 to about 12 times greater than said fuel injection hole diameter; and a recession distance extending between said fuel injection hole and said exit end along said tube axis, said recession distance being about 1 to about 100 times greater than said fuel injection hole diameter.