Impingement cooled crossfire tube assembly in multiple-combustor gas turbine engine

A crossfire tube assembly for propagating flame between first and second combustors, comprising:

• an impingement sleeve having first and second ends;
• means including an annular flange in said first combustor receiving a first end of said impingement sleeve for affixing said first end in said first combustor;
• means for affixing said second end in said second combustor;
• a crossfire tube centrally disposed within said impingement sleeve;
• a flow channel between said crossfire tube and said impingement sleeve;
• a plurality of impingement cooling holes in said impingement sleeve, said plurality of impingement cooling holes forming a plurality of jets of air which impinge upon, and cool, said crossfire tube;
• a flow dam centrally disposed in said flow channel, said flow dam for substantially preventing flow of air therepast;
• and,
• means for permitting an exit of impingement air from said flow channel into said first and second combustors;
• and wherein said crossfire tube includes an outward flare in a portion thereof extending beyond an end of said impingement sleeve, said outward flare directing impingement air exiting said flow channel outward toward said annular flange.

A crossfire tube assembly for propagating flame between first and second combustors, comprising:

• an impingement sleeve having first and second ends;
• means for affixing said first end in said first combustor;
• means for affixing said second end in said second combustor;
• a crossfire tube centrally disposed within said impingement sleeve;
• a flow channel between said crossfire tube and said impingement sleeve;
• a plurality of impingement cooling holes in said impingement sleeve, said plurality of impingement cooling holes forming a plurality of jets of air which impinge upon, and cool, said crossfire tube;
• a flow dam centrally disposed in said flow channel, said flow dam for substantially preventing flow of air therepast;
• and,
• means for permitting an exit of impingement air from said flow channel into said first and second combustors;
• and wherein said crossfire tube includes at least first and second vent holes, said first vent hole being disposed close to a first side of said flow dam, whereby a first air flow is urged to flow in said flow channel toward a center of said crossfire tube, and said second vent hole being disposed close to a second side of said flow dam, whereby second flow is urged to flow in said flow channel toward said center of said crossfire tube.