Premixed direct injection nozzle

摘要

A fuel/air mixing tube (130) for use in a fuel/air mixing tube bundle (121) is provided. The fuel/air mixing tube (130) includes an outer tube wall (201) extending axially along a tube axis between an inlet end (134) and an exit end (135), the outer tube wall (201) having a thickness extending between an inner tube surface (203) having a inner diameter and an outer tube surface (202) having an outer tube diameter. The tube (130) further includes at least one fuel injection hole having a fuel injection hole (142) diameter extending through the outer tube wall (201), the fuel injection hole (142) having an injection angle relative to the tube axis. The invention provides good fuel air mixing with low combustion generated NOx and low flow pressure loss translating to a high gas turbine efficiency, that is durable, and resistant to flame holding and flash back.