Patent ID: 8505302

Claim:
A premixer for a combustor, comprising: a fuel plenum comprising: a plurality of fuel tubes comprising a first plurality of fuel tubes and a second plurality of fuel tubes; a first chamber in communication with the first plurality of fuel tubes; and a second chamber in communication with the second plurality of fuel tubes; a burner tube comprising a plurality of air tubes, wherein the plurality of fuel tubes extend at least partially into the plurality of air tubes; a bell mouth disposed at least partially about the plurality of fuel tubes and extending from an aft end of the burner tube towards an aft end of the premixer to direct air into the plurality of air tubes; a fuel plenum flange extending radially about the fuel plenum; a burner tube flange extending radially about the burner tube axially downstream of the bell mouth with respect to the direction of fuel flow; and one or more spacers connecting the fuel plenum flange and the burner tube flange.